(IV-7-3) General Safety

IV 

Rules for the Certification and Construction 

Industrial Services 

7 Offshore Substations 

3 General Safety 

Edition 2013

The following Rules come into force on 1 October 2013. 

Germanischer Lloyd SE 

Head Office 

Brooktorkai 18, 20457 Hamburg, Germany 

Phone: +49 40 36149-0 

Fax: +49 40 36149-200 

headoffice@gl-group.com 

www.gl-group.com 

"General Terms and Conditions" of the respective latest edition will be applicable 

(see Rules for Classification and Construction, I - Ship Technology, Part 0 - Classification and Surveys). 

Reproduction by printing or photostatic means is only permissible with the consent of 

Germanischer Lloyd SE. 

Published by: Germanischer Lloyd SE, Hamburg

Rules IV Industrial Services 

Part 7 Offshore Substations 

Chapter 3 General Safety 

Table of Contents 


Section 1 Risk Assessment / Hazard Identification 

A General ....................................................................................................................... 1-1 

B Hazard Identification and Risk Assessment Process ................................................. 1-1 

Section 2 Marking Platform 


B Substation Marking Equipment................................................................................... 2-1 

Section 3 

Means of Escape and Evacuation 


B Design Principles ........................................................................................................ 3-2 

C Muster Area ................................................................................................................ 3-4 

D Electrical Requirements.............................................................................................. 3-4 

E Documentation............................................................................................................ 3-5 

Section 4 

Live-Saving Appliances 


B Survival Crafts............................................................................................................. 4-2 

C Rescue Boats.............................................................................................................. 4-3 

D Lifejackets ................................................................................................................... 4-4 

E Immersion Suits and Anti-Exposure Suits .................................................................. 4-4 

F Lifebuoys..................................................................................................................... 4-4 

G Radio Life-Saving Appliances..................................................................................... 4-5 

H Distress Flares ............................................................................................................ 4-5 

I Line-Throwing Appliances .......................................................................................... 4-5 

J Emergency Warnings and Instructions ....................................................................... 4-5 

Section 5 

Access and Transfer 


B Boatlanding ................................................................................................................. 5-1 

C Personal Transfer by Crane........................................................................................ 5-2 

D Helicopter Landing Facilities....................................................................................... 5-5 

E Safety Provisions for Helicopter Facilities................................................................... 5-7 

F Helicopter Winching Facilities..................................................................................... 5-9 

Section 6 

Fire Safety - General 


B Fire Control Stations ................................................................................................... 6-2 

C Fire Control Plans ....................................................................................................... 6-2 

D Definitions ................................................................................................................... 6-3 

E Submission of Documents .......................................................................................... 6-4 

Edition 2013 Germanischer Lloyd Page 3





Section 7 Passive Fire Protection 

A Materials and Definition of Spaces ............................................................................. 7-1 

B Ventilation and Fire Dampers ..................................................................................... 7-6 

Section 8 

Active Fire Protection 


B Arrangements in Machinery Spaces and Spaces Containing Fired Processes ......... 8-2 

C Arrangements in Spaces Containing Large Oil Filled Electrical Equipment............... 8-2 

D Additional Requirements for Specific Lockers and Galley Facilities........................... 8-3 

E Water Fire Extinguishing Systems.............................................................................. 8-3 

F Foam Fire Extinguishing Systems .............................................................................. 8-6 

G Fixed Gas Fire Extinguishing Systems ....................................................................... 8-8 

H Portable Fire Extinguishers and Fireman's Outfit ..................................................... 8-13 

Section 9 

Fire and Gas Detection Alarm Systems 


B Manual Alarm .............................................................................................................. 9-2 

C Arrangement of Fire Detectors and Alarm Loops ....................................................... 9-2 

D Public Address and General Alarm System................................................................ 9-3 

Edition 2013 Germanischer Lloyd Page 4




Section 1 

Risk Assessment / Hazard Identification 

Section 1 



B Hazard Identification and Risk Assessment Process ................................................. 1-1 

A 

General 

A.1 Scope 

This section provides general requirements for safety assessments, aiming for identifying and evaluating 

hazard and managing the risks. 

A.2 Definitions 

HAZARD [ISO 17776:2000] A Hazard is a potential Source of harm, which may be related to 

• human injury, 

• damage to the environment, 

• damage to property or 

• a combination of these 

A HAZARDOUS EVENT [ISO 17776:2000] is an incident which occurs, when a hazard is realized. 

RISK [ISO 17776:2000] Risk is the combination of probability of an event and the consequence of the 

event. 

A.3 Application 

For new installations or activities it is important to identify potential hazards as early as possible, in order 

that sufficient time can be given to the study and evaluation of the hazard before determining the most 

appropriate solutions to manage it. It is always easier to make modifications early in the design stage of a 

project, when changes can be made with minimal effect on cost and schedule. [ISO 17776:2000] 

Safety assessment comprised the application of recognized design standards. National and international 

standards will provide the basis for detailed engineering design by the application of, and findings from, 

the assessment. 

The basic principles of the assessment shall be applied to all aspects of the installation design including 

• arrangement, 

• structural and electrical design, 

• fire and explosion protection, 

• access and transfer as well as 

• emergency response. 

B 

Hazard Identification and Risk Assessment Process 

Hazard Identification and risk assessment involves a series of steps as described below: 

Step 1 Identification of the hazard 

This should be done based upon consideration of factors such as: 

• External hazards (e. g. ship collision, extreme environmental conditions, helicopter crash) 

• Arrangement of equipment 

Edition 2013 Germanischer Lloyd Page 1–1




Section 1 


• Substances handled on the substation 

• Operating and maintenance procedures and conditions 

Step 2 Assessment of the Risk 

This should be done based on the hazards identified and by consideration of the tolerability to personnel, 

the facility and the environment. This normally involves the identification of 

• initiating events, 

• identification of possible accident escalation 

• estimation of the probability 

• assessment of consequences 

The acceptability of the estimated risk must then be judged based upon criteria appropriate to the particular 

situation. Such risk acceptance criteria, which are the limits above which the operator will not tolerate 

risk on the installation, shall be defined for each type of risk assessed. 

Step 3 Risk mitigation 

Where the risk level is deemed to be not acceptable, the definition of measures for mitigation of risk is 

required. This involves identifying opportunities to reduce the probability and/or consequence of a hazardous 

event. 

Different risk levels may require different strategies to manage them. For instance, major risks may require 

quantitative assessment with detailed mitigation recommendations developed while negligible risks 

may be controlled by simple compliance with codes or standards. 

Codes & Standards: 

• [1] GL Rules for Fixed Offshore Installations (IV-6-3), Section 1, C.4 

• [2] ISO 17776, 2000 

• [3] BSH 7005, page 28 Risk assessment for the significant working phases 

• [4] MODU 2009 / SOLAS 

• Other codes and Standards may be accepted in case by case 



Part 7 Offshore Technology 


Section 2 

Marking Platform 

Section 2 



B Substation Marking Equipment................................................................................... 2-1 

A 


A.1 Visual marking 

A.1.1 The parts of substructure above the water level as well as the topsides of the installation shall 

be painted according to local authority requirements to facilitate best visibility for the ship traffic (e.g. yellow, 

see e.g. IALA O-139). 

A.1.2 The installation shall be also marked with nameplates for close-up range identification, visible 

from all sides of the platform. The identification marking shall be visible during day and night time and 

shall be illuminated during darkness. Identification shall be generally provided with black letters/numbers 

of 1m height on yellow background. 

Detailed font type, location and illumination of identification marking shall be agreed with the local authority. 

For the installation in German waters for example please refer to the requirements (WSD Richtlinie) 

for an approved “Kennzeichnungskonzept” and “Umsetzungsplan”. 

B 

Substation Marking Equipment 

B.1 Offshore units and installations fixed at the operation site are to be equipped with nautical 

facilities conforming to the IALA Recommendations for the Marking of Man-made Offshore Structures 

(IALA O-139) and the requirements for safety of navigation of the coastal state in whose waters the site is 

located. These may include signal lights and sound signaling devices for fog as well as other systems 

such as Radar beacons, Sonar or Automatic Identification System (AIS, see IALA A-126). 

B.2 AIS, signal lights and sound signalling devices for fog which transmit a coded signal for the 

identification of the offshore structure are to be provided with their own emergency battery. The capacity 

of this battery, assuming simultaneous operation of all consumers, is to be rated to provide a supply for at 

least 96 hours, unless some other period is specified by national regulations. 

B.3 The coding and range of the radio, visual and sound signalling equipment are governed by the 

national regulations relating to the site. 

B.4 The switchboard for the signalling equipment is preferably to be sited in a permanently 

manned room, e.g. the control station or an equivalent location. The switchboard IP rating shall be in line 

with its installation location according to the requirements as set out in GL Rules for Electrical Equipment 

(IV-7-5). 

B.5 Each signalling device is to be supplied from the switchboard by its own feeder which is to be 

protected by a fuse or automatic circuit breaker. 

B.6 The failure of a signalling device is to be indicated visually and audibly and shall be also indicated 

in the station control system. 

B.7 The switchboards are to be supplied from the emergency switchboard and a suitable emergency 

battery fulfilling the requirements as mentioned in GL Rules for Electrical Equipment (IV-7-5). 





Section 2 


In the event of a mains failure, the supply shall switch automatically to the emergency battery. 

B.8 A charger is to be assigned exclusively to meet the needs of the battery. Failure of the charger 

and switch-over to the battery shall be indicated at the switchboard and in the station control system. 

B.9 Where the signalling devices are switched on and off automatically, e.g. by photo-electric 

switches, remote control, radio signals or visibility sensors, the switchboard is to be provided with a manual/automatic 

selector switch. The operating mode at any time shall be indicated and controlled by the 

station control system. 

B.10 Additionally to the above requirements concerning marine navigational aids, also the installation 

of aviation obstruction lights shall be considered in case of elevated structures above a helicopter 

landing deck on the substation. Applicable rules and standards (e.g. ICAO, CAP437, etc.) as well as applicable 

national regulations shall be observed. For details refer also to GL Rules for Electrical Equipment 

(IV-7-5). 

B.11 Requirements for tests and type approvals of such marking equipment may be considered. 

Please note, that the local authorities may have the requirements for type approval of the Substation and 

Wind Farm marking equipment as well as for initial and/or periodical inspections of these items. 





Section 3 


Section 3 



B Design Principles ........................................................................................................ 3-2 

C Muster Area ................................................................................................................ 3-4 

D Electrical Requirements .............................................................................................. 3-4 

E Documentation............................................................................................................ 3-5 

A 


A.1 Scope 

In case of emergency both matters, escape and evacuation are subject to this Section which describes 

principles, requirements and guidance for the design of adequate and effective facilities for safe and controlled 

disembarkation of the personnel on the installation/unit. 

All matters respecting survivability shall be combined in an evacuation, an escape and a rescue strategy. 

A.2 Codes and Standards 

Following codes and standards shall apply: 

• IMO SOLAS Chapter II-2, as amended 

• ISO 14122 Safety machinery – Permanent means of access to machinery – Part 1 to 4 

• ISO 17631 Ships and marine technology – Ship-board plans for fire protection, life-saving appliances 

and means of escape 

• see also codes and standards in Section 5 Access and Transfer 

• National requirements are subject to the location of the installation/unit and to be observed 


A.3.1 

Emergency lighting 

Lighting which will ensure adequate light conditions on the installation in the event of failure of the main 

power supply. 

A.3.2 

Escape 

The act of persons moving away from a hazardous event to a safer place. 

A.3.3 

Evacuation 

The planned and controlled method of leaving the installation without directly entering the sea. 

A.3.4 

Hazardous area 

Three-dimensional space in which a explosive gas atmosphere may be expected to be present at such 

frequencies as to require special precautions for the control of potential ignition sources. 

A.3.5 

Non-hazardous area 

Area in which an explosive gas atmosphere is not expected to be present in quantities such as to require 

special precautions for the construction, installation and use of electrical apparatus and equipment. 

A.3.6 

Muster area 

Area where mustering shall take place in the event of general and/or evacuation alarm. 





Section 3 


A.4 Abbreviations 

IMO International Maritime Organization 

PA Public address system 

SOLAS Safety of Life at Sea (IMO) 

UPS Uninterruptible power supply 

B 

Design Principles 

B.1 Escape Routing 

B.1.1 


B.1.1.1 In every area which is likely to be regularly or temporarily manned or in which personnel are 

accommodated at least two separate escape routes shall be provided, situated as far apart as practicable, 

to allow ready means of escape to the open decks and embarkation stations. Primary and secondary 

escape routes shall be foreseen. 

Exceptionally, GL may permit only one route of escape, due regard paid to the nature and location of 

spaces and to the number of persons who might normally be accommodated or employed there. 

B.1.1.2 Two routes of escape shall be provided from every machinery space such as those containing 

major electrical equipment. 

B.1.1.3 Every escape route shall be readily accessible and unobstructed and all exit doors along the 

route shall be readily operable. Dead-end corridors exceeding 7 m in length are not permitted. Switchboards 

more than 7 m long shall not form dead end corridors. 

B.1.1.4 Primary escape routes and stairways shall not be less than 1000 mm in clear width and 2.1 m 

in height (2050 mm for doors). It has to be ensured that access ways are sufficiently sized to allow for 

stretcher operation from all accessible parts of the platform. 

B.1.1.5 Escape routes shall be well marked, including signs. Marking shall show the preferred direction 

of escape. 

B.1.1.6 Personnel shall be able to use the escape routes without being exposed to excessive toxic 

fumes, smoke or unacceptable heat loads, hot liquids or falling objects. Special consideration is to be 

given to routing of medium and high voltage cables in escape routes. 

B.1.1.7 

B.1.1.8 

Escape routes should not be routed over hatches or lay-down areas. 

Escape routes on deck shall be provided with non-skid coating or equivalent means. 

B.1.1.9 In addition to these requirements of this chapter, national requirements, if applicable, for emergency 

escape and arrangement of stairs and ladders are to be observed. 

B.1.2 

Door arrangement 

B.1.2.1 Doors in escape routes shall, in general, open in-way of the direction of escape, except that 

individual cabin doors may open into the cabins in order to avoid injury to persons in the corridor when 

the door is opened. 

B.1.2.2 All doors shall be constructed so that one person can easily open them from either side. They 

shall open in the direction of escape, without blocking the outside escape route. 

B.1.3 

Stairs, ladders 

B.1.3.1 Stairways shall normally be used for means of vertical escape, however, a vertical ladder may 

be used for secondary means of escape when the installation of a stairway is shown to be impracticable. 





Section 3 


B.1.3.2 Stairs and ladders are to be designed according to ISO 14122. Landings shall have the same 

size as the stairways. 

B.1.3.3 

B.1.4 

Ladders, stairs and walkways shall be of steel or other equivalent material. 

Lifts 

B.1.4.1 Lifts shall not be considered as forming one of the required means of escape. However, it shall 

be possible to escape from the lift and the hoist way with the lift at any elevation. Upon loss of main 

power supply, lifts shall automatically go to next floor level and stop. 

B.1.4.2 Any lift shall meet requirements of local regulations and shall be inspected, tested and maintained 

by qualified persons. 

B.2 Rescue and Recovery 

B.2.1 General 

It shall be possible to rescue and recover persons from sea back to platform or to a safe place. 

B.2.1.1 Opportunities to rescue and to recover persons shall be available in acc. to location, environmental 

conditions and number of persons. 

B.2.1.2 A rescue and recovery philosophy and plan shall be prepared. 

Following items to be observed: 

• number of persons who may need to be rescued or recovered 

• capacity, remoteness and response time of the emergency services 

• potential limitations on availability, e.g. daytime, weather conditions and sea states 

• all stages of the operation to be covered 

• additional work activities are required, e.g. over side, under deck 

• additional tools for emergency situations 

B.3 Evacuation 

B.3.1 The purpose of the evacuation system is to ensure means of safe abandonment of the installation/unit 

for the maximum personnel on board, following a hazardous incident and a decision to abandon 

the installation/unit. 

B.3.2 The preferred methods of evacuation for installations/units have to be defined and may include 

the following: 

• helicopter 

• lifeboats, conventional or free-fall 

• escape chute with life rafts 

• life rafts, over board or davit launched 

• boat landing 

B.3.3 Number, size and location of evacuation means shall be established based on manning, risk 

analyses (e.g. risk exposure of muster area and escape routes towards this area) and the evacuation, 

escape and rescue strategy. Primary and secondary means to be named. 





Section 3 


C 

Muster Area 

C.1 General 

C.1.1 At least one safe route of two from any position on the installation/unit to the muster area shall 

be available. 

C.1.2 The muster areas and the access to the evacuation station shall be arranged and protected in 

order to evacuate the actual number of personnel in an organized and efficient way. Special consideration 

is to be made to movement of persons on stretchers. 

C.1.3 The muster area shall be located at lifeboat embarkation point or in a protected area with direct 

access to lifeboats or other primary way of escape. 

C.1.4 

Muster and embarkation stations should be adequately illuminated by emergency lighting. 

C.2 Communication and Control 

C.2.1 The PA, alarm and communication system shall warn and guide personnel as quickly as possible 

in the event of a hazardous or emergency situation. 

C.2.2 Minimum following communication facilities are to be provided at primary muster station: 

• Two hand portable radios 

• Technical facilities to make PA announcements 

C.2.3 Facilities to initiate emergency shutdown, if provided, are to be arranged in the vicinity of the 

muster station. 

C.2.4 The PA, alarm and emergency communication systems depend on emergency power systems, 

consisting of emergency generators and UPS. 

D 

Electrical Requirements 

D.1 Emergency lighting and power supply 

Details see Chapter 5. 

D.2 Escape route lighting 

D.2.1 In addition to the emergency lighting the means of escape in accommodation areas, including 

stairways and exits, should be marked by lighting or photo luminescent strip indicators placed not more 

than 300 mm above the deck at all points of the escape route, including angles and intersections. The 

marking should enable personnel to identify the routes of escape and readily identify the escape exits. 

If electric illumination is used, it should be supplied by the emergency source of power and it should be so 

arranged that the failure of any single light or cut in a lighting strip will not result in the marking being ineffective. 

Additionally, escape route signs and fire equipment location markings should be of photo luminescent 

material or marked by lighting. 

D.2.2 Such lighting or photo luminescent equipment has been evaluated, tested and applied in accordance 

with the SOLAS. 

D.3 Public address, alarm and emergency communication 

Details see GL Rules for Electrical Equipment (IV-7-5). 





Section 3 


E 

Documentation 

E.1 General 

All documents submitted for approval and/or review shall include all required details. 

E.2 List of documents 

Following drawings are subject for review and approval: 

• safety plans showing escape and embarkation at each level of the installation/unit with routes and 

means for personnel protection with following details: 

◦ primary and secondary means of escape to be mentioned 

◦ width of stairways, doors, corridors and landing areas 

◦ muster areas 

◦ means of life-saving appliances 

◦ location of personal protective equipment 

• arrangements drawings of stairs and ladders 

• lighting layouts including marked emergency lighting arrangement 

• lighting calculation 

E.3 Evacuation analysis 

Escape routes shall be evaluated by an evacuation analysis early in the design process. The analysis 

shall be used to identify and eliminate, as far as practicable, congestion which may develop during abandonment, 

due to normal movement of personnel and crew along escape routes, including the possibility 

that a rescue team may need to move along these routes in a direction opposite the movement of personnel. 

In addition, the analysis shall be used to demonstrate that escape arrangements are sufficiently flexible to 

provide for the possibility that certain escape routes, assembly stations, embarkation stations or survival 

craft may not be available as a result of a casualty. 





Section 4 


Section 4 



B Survival Crafts............................................................................................................. 4-2 

C Rescue Boats.............................................................................................................. 4-3 

D Lifejackets ................................................................................................................... 4-4 

E Immersion Suits and Anti-Exposure Suits .................................................................. 4-4 

F Lifebuoys..................................................................................................................... 4-4 

G Radio Life-Saving Appliances..................................................................................... 4-5 

H Distress Flares ............................................................................................................ 4-5 

I Line-Throwing Appliances........................................................................................... 4-5 

J Emergency Warnings and Instructions ....................................................................... 4-5 

A 



For the purpose of this chapter, unless expressly provided otherwise, the terms used, relating to lifesaving 

appliances, are as defined in SOLAS regulation III/3. 

A.2 Rules and Guidelines 

A.2.1 Life-saving appliances should be evaluated, tested and approved, as provided in SOLAS regulations 

III/4 and III/5. 

A.2.2 New and novel life-saving appliances should meet the applicable provisions of SOLAS chapter 

III, including those for servicing and maintenance. 

A.2.3 Life-saving appliances and equipment shall comply with the relevant applicable International 

and/or National Regulations and GL Rules. 

All such equipment shall be type approved and tested in acc. to SOLAS and national requirements. 

Stricter requirements may be necessary to fulfill survivability requirements. 

A.2.3.1 International regulations 

The following international regulations are relevant at the time of issue of these Guidelines: 

• International Maritime Organization (IMO): International Convention for the Safety of Life at Sea 

(SOLAS), Chapter III - Life-Saving Appliances and Arrangements, as far as practicable 

• International Life-Saving Appliances Code (LSA), IMO Resolution MSC.320(89) adopted 2011 entering 

into force on the 1st January 2013 

A.2.3.2 European regulations 

The following regulations of the European Communities are relevant at the time of issue of these Guidelines: 

• Maritime Equipment Directive 96/98/EC (MED) Amended by 2008/67/EC of 30 June 2008 





Section 4 


B 

Survival Crafts 

B.1 Manned installations 

B.1.1 On each manned installation at least one lifeboat complying with the requirements of the LSA 

Code shall be provided. Depending on outcome of evacuation assessment more than one may be required 

based on actual size of the installation, overall number of persons onboard and general platform 

arrangement. The lifeboat capacity has to be sufficient to accommodate the total number of persons on 

board. 

B.1.2 Special consideration is to be given to retrieval of persons from sea. For this purpose a lifeboat 

with MOB capabilities or a fast rescue boat shall be provided. A lifeboat may be accepted as a rescue 

boat, provided that it and its launching and recovery arrangements also comply with the requirements 

for a rescue boat. 

B.2 Manned and unmanned installations: 

B.2.1 On each installation a launchable liferaft or liferafts, complying with the requirements of the 

LSA Code shall be provided. The liferafts shall be approved to the actual operating height, capable of 

being launched on either side of the unit. The total capacity available on each side shall be sufficient to 

accommodate the total number of persons on board, unless an analysis is presented and approved by GL 

to show that a smaller capacity can be accepted. 

B.3 Unmanned installations 

B.3.1 Special consideration is to be given to retrieval of persons from sea. This can be achieved 

• by installation of rescue boat on the platform; or 

• by having a vessel with MOB capabilities in the immediate vicinity of the installation when people are 

on board. 

B.4 Survival craft launching stations 

B.4.1 Survival craft launching stations should be in such positions as to ensure safe launching having 

particular regard to clearance from steeply overhanging portions of the platform. As far as possible, 

launching stations should be located so that survival craft can be launched down a straight side of the 

platform, except for: 

• survival craft specially designed for free-fall launching; and 

• survival craft mounted on structures intended to provide clearance from lower structures. 

B.4.2 Operating instructions and illustrations should be provided on or in the vicinity of survival craft 

and their launching controls and should: 

• illustrate the purpose of controls and the procedures for operating the appliance and give relevant 

instructions or warnings; 

• be easily seen under emergency lighting conditions; and 

• use symbols in accordance with the recommendations of SOLAS, MODU Code, National Regulations, 

etc. as far as applicable 

B.5 Stowage of survival craft 

B.5.1 Each survival craft should be stowed: 

• so that neither the survival craft nor its stowage arrangements will interfere with the operation of any 

other survival craft or rescue boat at any other launching station; 

• as near the water surface as is safe and practicable; 

• in a state of continuous readiness so that two crew members can carry out preparations for embarkation 

and launching in less than 5 min; 





Section 4 


• fully equipped as required by the LSA Code; however, in the case of platforms installed in areas 

such that, in the opinion of GL, certain items of equipment are unnecessary, GL may allow these 

items to be dispensed with; 

• as far as practicable, in a secure and sheltered position and protected from damage by fire, explosion 

ore crane operation. 

B.5.2 

Lifeboats should be stowed attached to launching appliances. 

B.5.3 Liferafts should be so stowed as to permit manual release of one raft or container at a time 

from their securing arrangements. 

B.5.4 

Davit-launched liferafts should be stowed within reach of the lifting hooks. 

B.6 Survival craft launching and recovery arrangements 

B.6.1 Launching appliances complying with the requirements of the LSA Code should be provided 

for all lifeboats and davit-launched liferafts. 

B.6.2 

the unit. 

Only one type of release mechanism should be used for similar survival craft carried on board 

B.6.3 Preparation and handling of survival craft at any one launching station should not interfere with 

the prompt preparation and handling of any other survival craft or rescue boat at any other station. 

B.6.4 During preparation and launching, the survival craft, its launching appliance and the area of 

water into which it is to be launched should be adequately illuminated by emergency lighting. 

B.6.5 

Prevent any discharge of fluids on to survival craft during abandonment. 

B.6.6 All lifeboats required for abandonment by the total number of persons permitted on board, 

should be capable of being launched with their full complement of persons and equipment within 10 min 

from the time the signal to abandon the unit is given. 

B.6.7 Manual brakes should be so arranged that the brake is always applied unless the operator, or 

a mechanism activated by the operator, holds the brake control in the “off” position. 

B.6.8 Consideration should be given to the location and orientation of the survival craft with reference 

to platform design and environmental orientation, such that clearance of the unit is achieved in an 

efficient and safe manner having due regard to the capabilities of the survival craft. 

C 

Rescue Boats 

C.1 Rescue boats should be stowed: 

• in a state of continuous readiness for launching in not more than 5 min; 

• if of an inflatable type, in a fully inflated condition at all times; 

• in a position suitable for launching and recovery; 

• so that neither the rescue boats nor their stowage arrangements will interfere with the operation of 

any survival craft at any other launching station; 

• in compliance with section B.5, if they are also lifeboats. 

C.2 Launching arrangements should comply with B.6 

C.3 Rapid recovery of the rescue boat should be possible when loaded with its full complement of 

persons and equipment. If the rescue boat is also a lifeboat, rapid recovery should be possible when 

loaded with its lifeboat equipment and the approved rescue boat complement of at least six persons. 





Section 4 


C.4 Rescue boat embarkation and recovery arrangements should allow for safe and efficient handling 

of a stretcher case. Foul weather recovery strops should be provided for safety if heavy fall blocks 

constitute a danger. 

D 

Lifejackets 

D.1 A lifejacket complying with the requirements of the LSA Code should be provided for every 

person on board of the platform. In addition, a sufficient number of lifejackets should be stowed in suitable 

locations for those persons who may be on duty in locations where their lifejackets are not readily accessible. 

In addition, sufficient lifejackets should be available for use at remotely located survival craft. 

D.2 Each lifejacket should be fitted with a lifejacket light complying with the requirements of the 

LSA Code. 

E 

Immersion Suits and Anti-Exposure Suits 

E.1 On each installation immersion suits complying with the requirements of the LSA Code, and of 

an appropriate size, for each person on board shall be provided. In addition: 

• a sufficient number of immersion suits should be stowed in suitable locations for those persons who 

may be on duty in locations where their immersion suits are not readily accessible; and 

• sufficient immersion suits should be available for use at remotely located survival craft positions to 

the satisfaction of the Administration. 

E.2 In lieu of immersion suits as required by paragraph E.1, an anti-exposure suit complying with 

the LSA Code, of an appropriate size, should be provided for every person assigned to crew the rescue 

boat or assigned to a marine evacuation system party. 

F 

Lifebuoys 

F.1 At least eight lifebuoys of a type complying with the LSA Code should be provided on each 

unit. The number and placement of lifebuoys should be such that a lifebuoy is accessible from exposed 

locations. 

F.2 Not less than one-half of the total number of lifebuoys should be provided with self-igniting 

lights of an approved electric battery type complying with the LSA Code. Not less than two of these 

should also be provided with self-activating smoke signals Lifebuoys with lights and those with lights and 

smoke signals should be equally distributed and should not be the lifebuoys provided with lifelines in 

compliance with the provisions of paragraph F.3. 

Lifebuoys fitted with self-igniting lights or self-activating smoke signals should be located outside hazardous 

areas. 

F.3 At least two lifebuoys in widely separated locations should each be fitted with a buoyant lifeline, 

the length of which should be at least one-and-a-half times the distance from the deck of stowage to 

the waterline or 30 m, whichever is greater. The lifeline should be so stowed that it can easily run out. 

F.4 Each lifebuoy should be marked in block capitals of the Roman alphabet with the name of the 

installation. 





Section 4 


G 

Radio Life-Saving Appliances 

G.1 Two-way VHF radiotelephone apparatus 

G.1.1 All lifeboats should carry a two-way VHF radiotelephone apparatus. In addition, at least two 

such apparatuses should be available on the installation, so stowed that they can be rapidly placed in any 

liferaft. 

G.1.2 All two-way VHF radiotelephone apparatus should conform to applicable performance standards 

as adopted by IMO. 

G.2 Search and rescue locating device 

G.2.1 All lifeboats should carry a search and rescue locating device. In addition, at least two such 

apparatuses should be available on the installation, so stowed that they can be rapidly placed in any liferaft. 

G.2.2 All search and rescue locating devices should conform to applicable performance standards 

as adopted by IMO. 

H 

Distress Flares 

H.1 Not less than 12 rocket parachute flares complying with the LSA Code should be carried and 

stowed on or near a permanently manned location. If the installation is not permanently manned, the 

flares should be stowed in a location acceptable to the Administration. 

I 

Line-Throwing Appliances 

I.1 A line-throwing appliance complying with the requirements of the LSA Code should be provided. 

J 

Emergency Warnings and Instructions 

For alarm and public address system see GL Rules for Instrumentation (IV-7-6). 





Section 5 


Section 5 



B Boatlanding ................................................................................................................. 5-1 

C Personal Transfer by Crane........................................................................................ 5-2 

D Helicopter Landing Facilities....................................................................................... 5-5 

E Safety Provisions for Helicopter Facilities................................................................... 5-7 

F Helicopter Winching Facilities..................................................................................... 5-9 

A 


The transfer of personnel is one of the hazardous activities for offshore operations. Purpose, scope and 

responsibilities shall be clearly defined, to avoid any damage and loss of life. Such transfers require risk 

assessment, training and competence, responsibility, equipment and communications. 

A.1 Risk asessment citeria 

Any transfer of persons or cargo between vessel/installation and installation shall be observed under the 

following premises: 

• Review of transfer options and selection of most safety practice 

• Risk of weather and sea conditions, vessel stability and crew experience 

• Vessels outfitting with position control and holding capacities 

• Position and orientation of vessel relating to the installation 

• Communication facilities 

• Visibility of activities 

A.2 Type of transfer 

Ship to offshore structures and vice versa 

• via boat landing 

• via cranes 

• via permanent structures 

• via temporary automatic devices like robot arm or equivalent 

• via helicopter 

A.3 Life sving apliances rquirements 

During all personnel transfer operations LSA incl. fast rescue boat shall be available and in state of readiness 

onboard the platform and/or onboard the vessel as required. 

B 

Boatlanding 

B.1 Boatlanding by vssel 

Boatlandings shall be built for fendering operations when a vessel docks or pushes against an installation 

structure. 





Section 5 


B.1.1 Design 

• The boat landings shall be designed to the expected loads from the largest expected size of service 

vessel. The maximum vessel size and approach speed shall be clearly marked on the boatlanding. 

• Two boatlandings should be considered, appropriately positioned to accommodate for prevailing 

wind, wave and tidal conditions. 

B.1.2 Operation 

• As a minimum, all personnel shall be provided with appropriate personal protection equipment including 

safety harness, head protection and a high visibility life jacket. A survival suit shall always be 

available for use. 

• Cargo, tools and baggage shall not be carried by persons. 

B.2 Boatlanding with gangway docking systems 

When a vessel mounted gangway which is connected directly or indirectly to the installation will be used, 

the following criteria should be applied: 

B.2.1 Design 

• All parts (structure of the installation, the landing platform, the gangway and the docking arrangement) 

shall be designed to withstand loads and impacts from the largest expected size of service 

vessel. 

• The vessel shall have a dynamic positioning system. 

• The maximum vessel size and approach speed shall be clearly marked on the structure. Maximum 

safe working load and maximum number of people allowed on the gangway at any one time shall be 

clearly marked. 

• The docking system shall be certified by an independent certification body. 

B.2.2 Operation 

• As a minimum, all personnel shall be provided with head protection and a high visibility life jacket. A 

survival suit shall always be available for use. 

• Cargo, tools and baggage shall not be carried by persons. 

C 

Personal Transfer by Crane 

C.1 Crane 

The crane shall be equipped with a special mode for personnel transfer. Range and operational loads are 

subject to the service requirements, mentioned in the specification and operations manual. 

C.2 Type of personnel transfer system 

The selection of transfer system depends on Company’s knowledge and experiences. Various transfer 

system are available in the offshore market. 

C.3 Location of boarding 

Several restrictions and requirements on board of the installation and on board the vessel shall apply for 

an easy boarding of personnel: 

• Size of area for both boarding and inspection for riggers as well as a free hoisting and lowering has 

to be safe and adequate. 

• Service range of lifting appliance during operation has to be considered. 

• Location of embarkation is to be marked. 

• Barriers to be installed to limit access only for authorized personal. 

• Area to be free of obstacles, e.g. each kind of piping, air vents, clamps, bollards etc. 





Section 5 


• Adequate illumination is to be provided. 

• Area to be wind-sheltered and spray protected. 

• Good visibility for both the crane operator and banksman. 

• Non-skid surface to be provided. 

• During transfer operation the required staff has to attend the operation permanently and without 

other duties. 

• In case of emergency safe exits for attending personnel is required. 

C.4 Approval, tests and surveys 

All equipment required for personal transfer, such as cranes, personal transfer systems, wire and loose 

gear etc. shall be approved, surveyed and tested. Type approval of sophisticated transfer carriers is preferable. 

Generally it is not part of the Certificate or Classification procedure for ships or offshore structures, but 

lifting appliances and personnel transfer systems may be included in the general survey scheme upon 

Owner’s request. 

C.5 Marking and identification 

C.5.1 Lifting appliances 

The following items shall be permanently marked on the appliance: 

• manufacturer 

• year of construction 

• type 

• order or manufacturing number 

• characteristics like rated load etc. 

• certificate number of Certifying Body 

• testing date: Month/year 

• any other necessary details 

C.5.2 Lifting equipment (personnel transfer system) 

The following items shall be permanently marked on the equipment: 

• manufacturer/ supplier 

• type 

• serial number 

• year of construction 

• weight of equipment in kilograms/tons 

• SWL/WLL in tons/kilograms 

• capacity of persons 

• minimum SWL for lifting appliance in tons 

• Certficate number of Certifying Body 

C.5.3 Interchangeable components 

The following items shall be permanently marked on the equipment: 

• certificate number 

• stamp of Certifying Body 

• testing date : Month/year 

• WLL in tons 





Section 5 


C.6 Design requirements for lifting appliance 

Generally the crane shall be designed in compliance to DIN EN 13852-1 for loading and discharging 

goods in the applied range of service and applicable environmental conditions. 

The crane incl. ropes shall be approved for man-riding by recognized society. 

Due to higher safety aspects for personnel transfers additional requirements shall apply: 

• separate mode for personnel transfer started by a key-operated switch 

• this specific mode shall be able to guarantee both soft acceleration and retardation 

• normal lifting and lowering speed during personnel transfers shall be limited to 0.5 m/s maximum 

• secondary break circuit with an independent and separate control 

• range of service shall be limited to wind maximum 10 m/s sea and state maximum significant wave 

height of 2 m 

• connection to emergency power system in case of blackout or other defects 

• under all circumstances it shall be possible to lowering the load to a safe place 

• the activation switches or levers shall be of hold-to-run type and shall be marked clearly and permanently 

• the control station for emergency lowering shall be positioned in a place that gives the operator a 

clear view of the load and the lifting zone 

• communication system for the crane driver with the responsible person 

• specific transport appliance for personnel transfer 

• the automatic overload protection system (AOPS) shall not activated 

• a direct drive from the lifting equipment is not allowed 

C.7 Design requirement for loose gear and interchangeable components 

For the purpose of these Regulations loose gear and interchangeable components includes following 

items: 

Hooks, swivels, rings, master links, shackles, pennants. 

The following shall be observed: 

• For personnel transfer services all loose gear tube calculated with a minimum static load of 10 times 

of the total load of the personnel transfer carrier, i.e. deadweight of equipment including loose gear 

plus weight of permissible load. 

• All loose gear shall be compatible with to both the lifting appliance and lifting equipment. 

• The crane hook has to be equipped with a safety latch or an additional secured safety device between 

Crane hook and lifting equipment. 

• The pennant has to be manufactured with ferrules and thimbles. Wire grips are not allowed. For 

each appliance a separate pennant is required, minimum length 1000 mm. Multi-sling pennants 

(maximum 4) have to be combined in a ring or master link. All shackles shall be C-type. 

C.8 Design requirements for personal transfer systems 

Several such carrier systems are available on the market with appropriated certification. 

The following design requirements are to be observed: 

• adequate fendering and shock absorbing system 

• to be equipped with suitable tag line 

• to be equipped with adequate rails and protective roof 

• to be equipped with adequate buoyancy devices to ensure self-righting in a stable condition when 

afloat 

• to be painted in bright color and marked with SWL and max. capacity of persons 

• to be equipped with fast click-buckle system and safe locking devices on access gates 





Section 5 


• to allow transport of stretchers in horizontal position for medevac purposes 

C.9 Loads and load conditions 

C.9.1 Loads 

Following loads to be considered: 

a) Accidental loads 

Are loads not normally occurring during installation and operating phases e.g. failing crane operations or 

falling dropped objects 

b) Dead load 

This is the self-weight of any component of the lifting appliance which is not included in any other load 

c) Design loads 

Load or load condition which forms basis for design and design verification 

d) Functional loads 

Loads due to normal operations including dynamic amplification 

e) Environmental loads 

Following influences and load effects have to be taken into consideration: Wind, waves (sea state, mainly 

significant wave height), temperature influences 

f) Permanent loads 

To be clearly documented and accounted for the design documents and calculations 

g) Static load 

For design of transfer units a calculation of all relevant forces shall apply including of load distribution of 

the equipment 

h) Test loads 

Required load for testing the lifting appliance and/or loose gear and/or lifting equipment. Safety factor is 

generally 2.2 × SWL. 

C.9.2 

Load conditions 

C.9.2.1 Operating loads 

Operating loads include all loads occurring during normal operations, i.e. 

• permanent loads 

• defined limited environmental loads 

• functional loads, here especially crane loads 

C.9.2.2 Limitation of operations 

Especially for cranes the change over to personnel lifting mode shall apply and extreme environmental 

loads, i.e. wind and sea state have to take into account. 

Furthermore any range limitation to be observed, if applicable. 

D 

Helicopter Landing Facilities 

D.1 Scope 

D.1.1 This Section summarizes main design considerations relating to helicopter landing facilities. 

Details of facilities and aspects which are mostly aeronautically determined, like size and marking of the 

helicopter deck, clearances around the platform, sectors for approach and take-off have to be treated 

according to the relevant international and national regulations or codes. 





Section 5 


D.1.2 In this Section it is assumed that the structure of the helicopter deck is made of steel. 

If a structure made of aluminum alloys shall be provided, the design should follow international rules. 

D.1.3 For electrical installations on helicopter facilities, e.g. obstruction, perimeter, windsock, flood 

and status lights see international standards. 

National requirements to be observed. 

D.2 Standards and regulations 

Depending on the location of the offshore installation or the flag state of the offshore unit relevant national 

and international standards and regulations have to be fulfilled besides of these GL Rules. 

The following examples can be defined: 

• ISO 19901-3 Standard: Petroleum and Gas, Industries – Specific Requirements for Offshore Structures 

– Topside Structure, 8.5 

• IMO: Code for the Construction and Equipment of Mobile Offshore Drilling Units (MODU Code), 

Chapters 9 and 13 

• IMO Res. A.855(20): Standards for on board Helicopter Facilities 

• ICS (International Chamber of Shipping): Guide to Helicopter/Ship Operations 

• CAP 437: Offshore Helicopter Landing Areas 

D.3 Helicopter data 

For providing relevant helicopter facilities the Owner/Operator has to define the following information: 

types of helicopters to be operated 

• geometrical main dimensions, especially length of fuselage, number and diameters of rotors, etc. 

• total overall length of the helicopter when the rotors are turning (D-value) 

• weight, weight distribution and wheel or skid configuration 

• highest vertical rate of descent on the helicopter deck, e.g. because of a single engine failure, etc. 

• data for winching operations, if applicable 

• lashing systems to be provided 

• possibility of an unserviceable helicopter stowed on the side of the deck while a relief helicopter is 

required to land, if applicable 

• fuel used and type and capacity of refueling equipment to be provided 

• starting equipment, if applicable 

D.4 Arrangement of the helicopter deck 

D.4.1 For the arrangement of the helicopter deck the following aspects have to be considered: 

• location on the installation/unit with respect to prevailing wind conditions, air turbulence and quality 

of the air flow due to adjacent structures 

• hot gas thermal effects due to flare plumes or exhaust emissions, which may degrade helicopter performance 

by increasing the ambient temperature 

• clear approach and take-off sector as recommended in international or national standards, 

• helidecks should be at or above the highest point of the main structure 

• the obstacle-free sector should be positioned facing into the prevailing wind so that the helicopter 

can approach into wind with the deck in the right-hand quadrant as viewed from the helicopter and 

facilitating an into wind overshoot in the clear sector 

• ready and protected access to and from the accommodation area without the need to pass through 

working areas 

• effect of adjacent structures of one installation or vessel affecting the air quality and obstacle protected 

surfaces of another installation or vessel 





Section 5 


D.4.2 In addition regarding the arrangement of the helicopter facilities within the whole installation or 

unit arrangement, applicable national regulations shall be observed. 

D.5 Documentation to be submitted 

D.5.1 Plans showing the arrangement, scantlings and details of the helicopter deck are to be submitted. 

The arrangement plan is to show the overall size of the helicopter deck and the designated landing 

area. If the arrangement provides for the securing of a helicopter or helicopters to the deck, the predetermined 

position(s) selected to accommodate the secured helicopter, in addition to location of deck fittings 

for securing the helicopter is to be shown. 

D.5.2 The helicopter for which the deck is designed is to be specified and calculations for the relevant 

loading conditions are to be submitted. 

D.5.3 Technical documentation for equipment, aviation fuel system and fire protection/fighting is to 

be provided. 

E 

Safety Provisions for Helicopter Facilities 

E.1 General 

This Section provides additional measures in order to address the fire safety objectives for units fitted with 

facilities for helicopters and meets the following functional provisions: 

• helideck structure should be adequate to protect the unit from the fire hazards associated with helicopter 

operations; 

• fire-fighting appliances should be provided to adequately protect the unit from the fire hazards associated 

with helicopter operations; 

• refueling facilities and operations should provide the necessary measures to protect the unit from the 

fire hazards associated with helicopter operations. Helicopter facility operation manuals, have to be 

included in the operation manual. Appropriate training should be provided. 

E.2 Construction 

The construction of the helidecks should be of steel or other equivalent materials. If the helideck forms 

the deck head of a deckhouse or superstructure, it should be insulated to “A-60” class standard. If aluminum 

or other low melting point metal construction that is not made equivalent to steel is used, the following 

provisions should be satisfied: 

• after each fire on the helideck or supporting structure the helideck should undergo a structural analysis 

to determine its suitability for further use. 

• if the helideck is located above the units deckhouse or similar structure, the following conditions 

should be satisfied: 

• the deckhouse top and bulkheads under the helideck should have no openings; 

• windows under the helideck should be provided with steel shutters; 

E.3 Escape 

A helideck should be provided with both a main and an emergency means of escape and access for firefighting 

and rescue personnel. These should be located as far apart from each other as is practicable and 

preferably on opposite sides of the helideck. 

E.4 Fire fighting appliances 

In close proximity to the helideck, the following fire-fighting appliances should be provided and stored 

near the means of access to that helideck: 

• at least two dry powder extinguishers having a total capacity of not less than 45 kg; 

• carbon dioxide extinguishers of a total capacity of not less than 18 kg or equivalent; 





Section 5 


• a foam application system consisting of monitors or foam-making branch pipes capable of delivering 

foam to all parts of the helideck in all weather conditions in which the helideck is intended to be 

available for helicopter operations. The minimum capacity of the foam production system will depend 

upon the size of the area to be protected, the foam application rate, the discharge rates of installed 

equipment and the expected duration of application: 

• a minimum application rate of 6 l/m2 within a circle having a diameter equal to the D-value; 

• a minimum of 5 min discharge capability should be provided; 

• foam delivery at the minimum application rate should start within 30 s of system activation; 

• at least two nozzles of an approved dual-purpose type (jet/spray) and hoses sufficient to reach any 

part of the helideck; 

• in addition to the provisions in Section 8, H.2, two fire-fighter’s outfits; and other equipment should 

be stored in a manner that provides for immediate use and protection from the elements, see requirements 

of helideck regulations. 

E.5 Drainage 

Drainage facilities in way of helidecks should be: 

• constructed of steel or other arrangements providing equivalent fire safety; 

• lead directly overboard independent of any other system; and 

• designed so that drainage does not fall onto any part of the unit. 

E.6 Helicopter refueling 

Where the unit has helicopter refueling, national regulations and the following provisions should be complied 

with: 

• A designated area should be provided for the storage of fuel tanks which should be as remote as is 

practicable from accommodation spaces, escape routes and embarkation stations; and isolated from 

areas containing a source of vapor ignition; 

E.6.1 The fuel storage area should be provided with arrangements whereby fuel spillage may be 

collected and drained to a safe location; tanks and associated equipment should be protected against 

physical damage and from a fire in an adjacent space or area; 

E.6.2 Where portable fuel storage tanks are used, special attention should be given to: 

• design of the tank for its intended purpose; 

• mounting and securing arrangements; 

• electric bonding; and 

• inspection procedures; 

E.6.3 Storage tank fuel pumps should be provided with means which permit shutdown from a safe 

remote location in the event of a fire. Where a gravity-fuelling system is installed, equivalent closing arrangements 

should be provided to isolate the fuel source; 

E.6.4 The fuel pumping unit should be connected to one tank at a time. The piping between the tank 

and the pumping unit should be of steel or equivalent material, as short as possible, and protected 

against damage; 

E.6.5 Electrical fuel pumping units and associated control equipment should be of a type suitable for 

the location and potential hazards; 

E.6.6 Fuel pumping units should incorporate a device which will prevent over-pressurization of the 

delivery or filling hose; 

E.6.7 

E.6.8 

Equipment used in refueling operations should be electrically bonded; 

“NO SMOKING” signs should be displayed at appropriate locations. 





Section 5 


F 

Helicopter Winching Facilities 

F.1 Winching operations 

F.1.1 For any fixed offshore installation or any mobile offshore unit, for which helicopters are a normal 

mode of transport of personnel, a helicopter landing area should be provided. 

Winching should not be adopted as a normal method of personnel transfer. 

F.1.2 If a regular delivery of supplies by winching, like provisions, spare parts, etc., is planned, 

measures for a convenient material flow from the winching area has to be provided. 

F.1.3 If winching operations are required, they shall be conducted in accordance with procedures 

agreed between the helicopter Operator, the Owner/ Operator of the offshore installation/unit and GL and 

shall be contained in the Operating Manual. 

F.2 Winching areas 

F.2.1 A winching area should, for operational effectiveness and safety, be located at the side or one 

end of an offshore installation/unit so that a large part of the maneuvering zone of the helicopter can extend 

outside the installation/ unit. The position of the operating area shall enable the pilot of the helicopter 

hovering over the winching area to have an unobstructed view of the installation/unit and be in position 

which will minimize the effect of air turbulence and flue gases. The area shall, as far as possible, be positioned 

clear of accommodation spaces, provide an adequate deck area for material and provide for safe 

access to the area from different directions. 

F.2.2 In selecting a winching area the desirability of keeping the winching height to a minimum shall 

also be borne in mind. In routine operations a winching height greater than 12 m shall be avoided. 

F.2.3 A winching area shall provide a “maneuvering zone” in which a clear zone shall be centered. 

The sizes of these areas are to be defined by the responsible national authority or flag state of the offshore 

installation/ unit. 

F.3 Winching above accommodation areas 

Some installation/units may only be able to provide winching areas which are situated above accommodation 

spaces. Due to the constraints of operating above such an area only twin-engine helicopters shall 

be used for such operations and the following procedures adhered to: 

• personnel shall be cleared from all spaces immediately below the helicopter operating area and from 

those spaces where the only means of escape is through the area immediately below the operating 

area 

• safe means of access to and escape from the operating area shall be provided by at least two independent 

routes 

• all doors, ports, skylights, etc. in the vicinity of the helicopter operating area shall be closed. This 

also applies to deck levels below the operating area. 

• fire and rescue parties shall be deployed in a ready state but sheltered from the helicopter operating 

are 





Section 6 


Section 6 



B Fire Control Stations ................................................................................................... 6-2 

C Fire Control Plans ....................................................................................................... 6-2 

D Definitions ................................................................................................................... 6-3 

E Submission of Documents .......................................................................................... 6-4 

A 


A.1 Safety Philosophy and Design Principles 

This Section provides principles for the design, construction and installation of fire protection for offshore 

substations. Minimum requirements will be described. 

Requirements for definition of fire scenarios and determination of safety criteria have to be defined in 

project specific documents, e.g. safety philosophy ore similar. 

For paint stores and battery rooms references to hazardous area classification and applicable codes and 

standards for protective measures (especially ventilation and gas detection) will be made. 

A.2 Governmental Authority 

Attention is directed to the appropriate governmental Authority of the country in which the unit or installation 

is to be registered, operated or installed, as there may be additional requirements depending on the 

size, type and intended service of the unit or installation as well as other particulars and details. 

A.3 Application 

A.3.1 The requirements in this Section apply to fire safety on fixed offshore installations; they are 

intended to make reference to the International Convention for the Safety of Life at Sea 2012 (SOLAS), 

as amended and to the MODU Code for the Construction and Equipment of Mobile Offshore Drilling 

Units, 2009 or other applicable guidelines. 

A.3.2 The term “Approved” relates to a material or construction, for which GL or other recognized 

authority has issued an Approval Certificate. A Type Approval Certificate can be issued on the basis of a 

successful standard fire test, which has been carried out by an independent and recognized fire testing 

institute. 

A.4 Fire safety objectives 

The fire safety objectives of this chapter are to: 

• prevent the occurrence of fire and explosion; 

• reduce the risk to personnel caused by fire; 

• reduce the risk of damage caused by fire to the unit, its equipment and the environment; 

• contain, control and suppress fire and explosion in the compartment of origin; and 

• provide adequate and readily accessible means of escape for personnel. 

A.5 Functional requirements 

In order to achieve the fire safety objectives, the following functional requirements are embodied in the 

regulations of this chapter as appropriate: 

1. division of the unit into main vertical and horizontal zones by thermal and structural boundaries; 





Section 6 


2. separation of accommodation spaces from the remainder of the unit by thermal and structural 

boundaries; 

3. restricted use of combustible materials; 

4. detection of any fire in the zone of origin; 

5. containment and extinction of any fire in the zone of origin; 

6. protection of means of escape and access for fire-fighting; 

7. ready availability of fire-extinguishing appliances; 

B 

Fire Control Stations 

B.1 Arrangement 

At least one control station, which is to be permanently manned or remote controlled, shall be provided in 

the safe area. 

Depending on the design of the offshore installation or unit, a second control station may be required. The 

arrangement of the control station(s) is to be determined from case to case. 

B.2 Equipment 

In the control station with the central fire alarm consoles the following items shall be provided: 

a) Means of communication between the stations essential to the safety of the installation/unit; 

b) arrangements for starting the fire pumps; 

c) manual means to set off the general and fire alarms; 

d) means of indicating whether fire doors are closed; 

e) the fire alarm central consoles, lists and location plans/tables of fire detectors and the control plans; 

f) the electric and electronic equipment as defined in GL Rules for Instrumentation (IV-7-6), Section 9, C 

C 

Fire Control Plans 

A fire control plan to be submitted with following details: 

• control systems and stations 

• fire sections for “A” and “B” class divisions boundaries of fire areas 

• fire detectors and manual call points 

• fire detection system 

• fire alarm sounders, e.g. bells, loud speakers, etc. 

• fixed fire systems including release stations for accommodation, boiler and/or engine rooms, lockers, 

work shop, etc. 

• portable fire extinguishing appliances 

• ventilation systems with dampers, control stations for fans, stopping of forced ventilation and closing 

appliances for inlets and outlets 

• emergency escape breathing devices (EEBD) 

• fire pumps (main and emergency), fire main, hydrants, hoses and nozzles 

• remote stop of fuel pumps and quick closing valves for fuel tanks 

• locations of fire control plans 

• remote closures of fire doors, if required 

Additionally following drawings required: 





Section 6 


• general arrangement with all levels of the installation/unit indicating the purpose of each area or 

room and the arrangements of machinery and equipment 

• categories of fire sections horizontally and vertically including typical details of each category 

D 

Definitions 

D.1 Non-combustible material 

Non-combustible material means a material which neither burns nor gives off flammable vapours insufficient 

quantity for self-ignition when heated to approximately 750 °C, this being determined to the satisfaction 

of GL by an established test procedure. Reference is made to the Fire Test Procedure Code, Annex 

1, Part 1 adopted by IMO by Resolution MSC.307(88). Any other material is a combustible material. 

D.2 Standard fire test 

A standard fire test is a test in which specimens of the relevant bulkheads or decks are exposed, in a test 

furnace, to temperatures corresponding approximately to the standard time-temperature curve. 

Reference is made to the 2010 Fire Test Procedure Code (FTP Code). 

D.3 "A" class divisions 

"A" class divisions are divisions formed by bulkheads and decks which comply with the following requirements. 

D.3.1 

D.3.2 

"A" class divisions shall be constructed of steel or other equivalent material. 

"A" class divisions shall be suitably stiffened. 

D.3.3 "A" class divisions shall be so constructed as to be capable of preventing the passage of 

smoke and flames to the end of the one-hour standard fire test. 

D.3.4 "A" class divisions shall be insulated with approved non-combustible materials such that the 

average temperature of the unexposed side will not rise more than 140 °C as per FTP Code above the 

original temperature, nor will the temperature, at any one point, including any joint, rise more than 180 °C 

above the original temperature within the time listed below: 

Class "A-60" 60 minutes 




D.4 "B" class divisions 

"B" class divisions are divisions formed by bulkheads, decks, ceilings or linings which comply with the 

following requirements. 

D.4.1 "B" class divisions shall be so constructed as to be capable of preventing the passage of 

flames until the end of the first half of the standard fire test. Reference is made to the 2010 Fire Test Procedure 

Code. 

D.4.2 "B" class divisions shall have an insulation value such that the average temperature of the 

unexposed side will not rise more than 140 °C above the original temperature, nor will the temperature at 

any one point, including any joint, rise more than 225 °C above the original temperature, within the time 

listed below: 

Class "B-15" 15 minutes 

Class "B-0" 0 minutes 





Section 6 


D.4.3 "B" class divisions shall be constructed of approved non-combustible materials, and all materials 

entering into the construction and erection of "B" class divisions shall be non-combustible, with the 

exception that combustible veneers may be permitted, provided they meet other requirements of this Section. 

D.5 "C" class divisions 

"C class divisions" are divisions constructed of approved non-combustible materials. They need meet 

neither requirements relative to the passage of smoke and flame nor limitations relative to the temperature 

rise. Combustible veneers are permitted, provided they meet other requirements of this Section. 

D.6 Low flame spread 

Low flame spread means that the surface thus described will adequately restrict the spread of flame, this 

being determined to the satisfaction of GL by an established test procedure. 

D.7 Steel or other equivalent material 

Where the words "steel or other equivalent material" are used, "equivalent material" means any noncombustible 

material which, by itself or due to insulation provided, has structural and integrity properties 

equivalent to steel at the end of the applicable exposure to the standard fire test (e.g. aluminium alloy with 

appropriate insulation). 

E 

Submission of Documents 

The following documents shall be submitted for approval: 

• General arrangement plans, indicating the intended purpose of the installation or unit, the purpose of 

each area or room and the arrangements of machinery and equipment. 

• Plans and documents detailing the arrangements of structural fire protection measures. 

• Plans and documents detailing fire extinguishing as well as fire detection and alarm systems. 

• Plans and documents detailing the relevant control system for the remote closure of fire doors and 

relevant valves. 

• Ventilation system plans showing the ducts and fire dampers and the positions of the controls for 

stopping the system. 

• Fire control plans. 





Section 7 

Passive Fire Protection 

Section 7 


A Materials and Definition of Spaces ............................................................................. 7-1 

B Ventilation and Fire Dampers ..................................................................................... 7-6 

A 

Materials and Definition of Spaces 

A.1 Scope 

Passive fire protection shall ensure that relevant structures, piping and equipment components have adequate 

fire resistance with regard to load bearing properties, integrity and insulation properties during a 

dimensioning fire, and contribute in reducing the consequences in general. 

Fire divisions shall ensure that a dimensioning fire and explosion does not escalate into surrounding areas. 

Passive fire protection shall prevent or mitigate serious consequences from fire also to protect personnel 

(heat and smoke) and make escape or evacuation possible. 

A.2 Definitions of spaces 

A.2.1 

Control stations 

Spaces which contain the following equipment are considered as Control Stations: 

• operational control systems 

• radio and telephone systems including emergency communication 

• fire detection and fire control systems 

• emergency source of power 

• fire extinguishing systems serving various locations 

A.2.2 

Corridors 

Corridors are spaces which serve the purpose of connecting other areas in order to provide carriage of 

personnel. 

A.2.3 

Accommodation spaces 

Accommodation spaces are those used as public spaces, corridors, lavatories, cabins, offices, hospitals, 

cinemas, recreational rooms, pantries containing no cooking appliances and similar spaces. 

Public spaces are those portions of the accommodation which are used for halls, dining rooms, lounges 

and similar permanently enclosed spaces. 

A.2.4 

Stairways 

Stairways are internal stairways, lifts and escalators (other than those wholly contained within the machinery 

spaces) and enclosures thereto. 

In this connection a stairway, which is enclosed only at one level, shall be regarded as part of the space 

from which it is not separated by a fire door. 

A.2.5 

Service spaces (low risk) 

Service spaces (low risk) are lockers, laundries, store rooms and working spaces, in which no flammable 

materials are stored. 





Section 7 

A.2.6 Machinery spaces of category A 

Machinery spaces of Category A are all spaces which contain internal combustion type machinery where 

such machinery has in the aggregate a total power of not less than 375 kW or machinery spaces which 

contain any fuel-fired boiler or heated oil fuel units; and trunks to such spaces. 

A.2.7 Other machinery spaces 

Other machinery spaces are all machinery spaces except those of Category A containing boilers and 

other electrical process equipment, oil fuel units, internal combustion engines, generators and major electrical 

machinery, filling stations, refrigerating, ventilation and air-conditioning machinery and similar 

spaces and trunks to such spaces. 

A.2.8 Hazardous areas 

Hazardous areas are all those areas where, due to the possible presence of a flammable atmosphere 

arising from the process operations, for example batteries ore stored and handled substances, the use of 

machinery or electrical equipment without proper consideration may lead to fire hazard or explosion. 

A.2.9 Service spaces (high risk) 

Service spaces (high risk) are lockers, store rooms and working spaces in which flammable materials are 

stored, galleys, pantries containing cooking appliances, paint rooms and workshops other than those 

forming part of the machinery space. 

A.2.10 Open decks 

Open decks are spaces which are not enclosed and which are fully subject to natural ventilation. 

A.2.11 Sanitary and similar spaces 

Sanitary and similar spaces are communal sanitary facilities such as showers, baths, lavatories, etc. and 

isolated pantries containing no cooking appliances. 

Sanitary facilities which serve a space and which have an access only from that space, shall be considered 

as a portion of the space in which they are located. 

A.3 Materials 


A.3.1 The requirements of this Section have been formulated principally for installations/units having 

their structural bulkheads and decks constructed of steel. 

A.3.2 Installations/units constructed of other materials may be accepted, provided that, in the opinion 

of GL, they provide an equivalent standard of safety. 

A.3.3 Material on the installation / unit shall be non-combustible. If it is justified from safety point of 

view to make use of materials that do not meet the requirements to non-combustibility, such materials 

shall have limited flame-spread properties, low smoke development and heat generation. Documentation 

shall be available to support the basis for the decision regarding selection of materials. 

An assessment shall be made of the toxicity of gas emitted in the event of fire. 

A.4 Fire integrity of bulkheads and decks 

A.4.1 In addition to complying with the specific provisions for fire integrity of bulkheads and decks in 

this Section, the minimum fire integrity of bulkheads and decks shall be as prescribed in Tables 7.1 and 

7.2. 

In areas with large oil containing equipment such as oil filled transformers critical items shall be designed 

to withstand a pool fire (150 kW/m 2 ) for 60 minutes. (At least A60) 

The following critical items shall be designed to withstand the specified design heat load: 

• protective walls 

• structures supporting oil pressure vessels 

• structures capable of blocking escape ways 





Section 7 


• essential safety systems 

• main structure. 

Special assessment of local conditions to terminate further critical items has to be carried out and agreed 

with GL. 

Table 7.1 

Fire integrity of bulkheads separating adjacent spaces 

Spaces 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 

Control stations 2.1 A-0 4 A-0 A-60 A-0 A-15 A-60 A-15 A-60 A-60 

5 

A-0 

Corridors 

Accommodations 

spaces 

Stairways 

Service spaces 

(low risk) 

Machinery spaces of 

category A 

Other machinery 

spaces 

2.2 

2.3 

2.4 

2.5 

2.6 

2.7 

C B-0 B-0 

A-0 2 B-0 A-60 A-0 A-0 A-0 

C B-0 

A-0 2 B-0 A-60 A-0 A-0 A-0 

B-0 B-0 A-60 A-0 A-0 A-0 5 

A-0 2 A-0 2 

C A-60 A-0 A-0 A-0 

1, 5 

A-0 1 A-60 A-60 

A-0 1, 3 A-0 A-0 

Hazardous areas 2.8 -- A-0 -- A-0 


(high risk) 

2.9 

5 

5 

5 

5 

5 

B-0 

C 

B-0 

A-0 2 

B-0 

A-0 

A-0 

A-0 3 5 A-0 

Open decks 2.10 -- 

5 

Sanitary and similar 

spaces 

Remarks 

2.11 

C 

1 Where the space contains an emergency power source or components of an emergency power source adjoining a space 

containing a service generator or the components of a service generator, the boundary bulkhead or deck between those 

spaces shall be an A-60 class division 

2 For clarification as to which note applies see A.5.4 and A.5.7 

3 Where spaces are of the same numerical category and superscript 3 appears, a bulkhead or deck of the rating shown in 

the Tables is only required when the adjacent spaces are for a different purpose, e.g. in category 2.9. A galley next to a 

galley does not require a bulkhead but a galley next to a paint room requires an A-0 bulkhead. 

4 Bulkheads separating the communication- and control room from each other may be B-0 rating. 

5 The division is required to be of steel or equivalent material, but need not be of A class standard 





Section 7 

Table 7.2 

Spaces below 

Fire integrity of decks separating adjacent spaces 

Spaces 

above 

2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 

Control stations 2.1 A-0 A-0 A-0 A-0 A-0 A-60 A-0 A-0 A-0 

Corridors 2.2 A-0 

Accommodations 

spaces 

2.3 A-60 A-0 

3 3 

Stairway 2.4 A-0 A-0 A-0 


(low risk) 

Machinery spaces of 

category A 

Other machinery 

spaces 

3 

A-0 

A-0 

2.5 A-15 A-0 A-0 A-0 

2.6 A-60 A-60 A-60 A-60 A-60 

3 

3 

3 

A-60 A-0 A-0 A-0 

A-60 A-0 A-0 A-0 

A-0 A-60 A-0 A-0 A-0 

3 

A-60 A-0 A-0 A-0 

1, 3 

A-60 A-60 A-60 

2.7 A-15 A-0 A-0 A-0 A-0 A-0 1 1, 3 A-0 A-0 

3 

A-0 

3 3 

3 3 

Hazardous areas 2.8 A-60 A-0 A-0 A-0 A-0 A-60 A-0 -- A-0 -- A-0 


(high risk) 

Open decks 2.10 

Sanitary and similar 

spaces 


2.9 A-60 A-0 A-0 A-0 A-0 A-0 A-0 A-0 A-0 2 3 A-0 

3 3 3 3 3 3 3 

2.11 A-0 A-0 

3 

A-0 

3 

-- 

A-0 A-0 A-0 A-0 

3 

3 

3 

3 

3 

-- 

A-0 

A-0 

A-0 

A-0 

3 

3 3 

Remarks 

1 Where the space contains an emergency power source or components of an emergency power source adjoining a space 

containing a service generator or the components of a service generator, the boundary bulkhead or deck between those 

spaces shall be an A-60 class division 

2 Where spaces are of the same numerical category and superscript 3 appears, a bulkhead or deck of the rating shown in 

the Tables is only required when the adjacent spaces are for a different purpose, e.g. in category 2.9. A galley next to a 

galley does not require a bulkhead but a galley next to a paint room requires an A-0 bulkhead. 

3 The division is required to be of steel or equivalent material, but need not be of A class standard. However, where a deck 

is penetrated for the passage of electric cables, pipes and vent ducts, such penetrations shall be made tight to prevent the 

passage of flame and smoke. 

A.4.2 

A.4.2.1 

Application of the tables 

Tables 7.1 and 7.2 apply respectively to the bulkheads and decks separating adjacent spaces. 

A.4.2.2 For determining the appropriate fire integrity standards to be applied to divisions between adjacent 

spaces, such spaces are classified according to their fire risk as show in A above in Categories 2.1 

to 2.11. The title of each category is intended to be typical rather than restrictive. 

The number preceding each category above refers to the applicable column or row in the Tables. 

A.4.3 In general, accommodation spaces, service spaces and control stations should not be located 

adjacent to hazardous areas. However, where it is not practicable, an engineering evaluation should be 

performed to ensure that the level of fire protection and blast resistance of the bulkheads and decks 

separating these spaces from the hazardous areas are adequate for the likely hazard. 

A.4.4 Bounderies to to external escape routes may have to constructed to A-60 standard depending 

on specific conditions, such as fire load, escape routes, number of personnel etc., to be agreed with GL. 

A.5 Structural requirements for doors, windows, stairways, ceilings, linings, etc. 

A.5.1 Fire and external doors 

External doors shall be constructed to "A-0" class division and be self-closing, where practicable. The 

construction of all doors and frames in "A" class divisions, including the means of securing them when 





Section 7 


closed, shall provide resistance to fire as well as to the passage of smoke and flames, as far as practicable, 

equivalent to that of the bulkheads in which the doors are situated. 

Such doors and door frames shall be constructed of steel or other equivalent material. Doors in "A" class 

divisions must be capable of being opened and closed from each side of the bulkhead by one person 

only. 

A.5.2 Intersections and penetrations 

In approving fire protection details, GL will have regard to the risk of heat transmission at intersections 

and thermal points of required thermal barriers. 

Where "A" class divisions are pierced for the passage of electric cables, pipes, trunks, ducts, etc., or for 

girders, beams or other structures, arrangements shall be made to ensure that the fire resistance is not 

impaired. Penetrations to be of approved type. 

If a space is divided with a deck or bulkhead of “A” class standard having insulation of different values, 

the insulation with the higher value should continue on the deck or bulkhead with the insulation of the 

lesser value for a distance of at least 450 mm. 

A.5.3 Windows 

GL permits windows outside hazardous areas to be of opening type. 

A.5.4 Corridors 

All bulkheads required to be "B" class divisions shall extend from deck to deck and to the deckhouse side 

or other boundaries, unless continuous "B" class ceilings or linings are fitted on both sides of the bulkhead, 

in which case the bulkhead may terminate at the continuous ceiling or lining. 

In corridor bulkheads, ventilation openings may be permitted only in and under the doors of cabins, public 

spaces, offices and sanitary spaces. The openings shall be provided only in the lower half of the door. 

Where such an opening is in or under a door, the total net area of any such opening or openings shall not 

exceed 0.05 m 2 . When such an opening is cut in a door it shall be fitted with a grille made of noncombustible 

material. Such openings shall not be provided in a door in a division forming a stairway closure. 

A.5.5 Stairs 

Stairs shall be constructed of steel or equivalent material. 

A.5.6 Stairways and lifts 

Stairways which penetrate only a single deck shall be protected at least at one level by "A" or "B" Class 

divisions and self-closing doors so as to limit the rapid spread of fire from one deck to another. 

Stairways and lift shafts which penetrate more than a single deck shall be surrounded by "A" class divisions 

and protected by self-closing doors at all levels. 

Self-closing doors shall not be fitted with hold-back hooks. However, hold-back arrangements incorporating 

remote release fittings of the fail-safe type may be utilized. 

Personnel lift trunks shall be protected by "A" class divisions. 

A.5.7 Air spaces 

Air spaces enclosed behind ceilings, paneling’s or linings shall be divided horizontally by close fitting 

draught stops spaced not more than 14 meters apart. 

In the vertical direction, such enclosed air spaces, including behind linings of stairways, trunks, etc. 

should be closed at each deck. 

A.5.8 Insulation 

Except for insulation in refrigerated compartments, insulation material, pipe and vent duct lagging, ceilings, 

linings and bulkheads shall be of non-combustible material. Insulation of pipe fittings for cold ser- 





Section 7 


vice 1 systems and vapor barriers and adhesives used in conjunction with insulation need not be noncombustible 

but they shall be kept to a minimum and their exposed surfaces should have low flame 

spread characteristics. In spaces where penetration of flammable liquids is possible, the surfaces of the 

insulation shall be impervious to the liquid or its vapors. 

A.5.9 Framing 

The framing, including supports and the joint pieces of bulkheads, linings, ceilings and draught stops, 

shall be of non-combustible material. 

A.5.10 Surfaces 

The following surfaces shall have low flame spread characteristics: 

• exposed surfaces in corridors and stairway enclosures 

• surfaces in concealed or inaccessible spaces in accommodation, service spaces and control stations 

• exposed surfaces of ceilings in accommodation, service spaces and control stations 

A.5.11 Veneers 

Bulkheads, linings and ceilings may have combustible veneers provided that the thickness of such veneers 

shall not exceed 2 mm within any space other than corridors, stairway enclosures and control stations, 

where the thickness should not exceed 1.5 mm. Alternatively veneers which have a caloric value 

not exceeding 45 MJ/m 2 of the area for the thickness used may be accepted by GL, irrespective of the 

thickness of those veneers. 

A.5.12 Deck coverings 

Primary deck coverings, if applied, shall be of approved materials, which will not readily ignite or give rise 

to toxic or explosive hazards at elevated temperatures. 

A.5.13 Paints and varnishes 

Paints, varnishes and other finishes used on exposed interior surfaces shall not offer an undue fire hazard 

in the judgment of GL and shall not be capable of producing excessive quantities of smoke or toxic 

fumes. 

B 

Ventilation and Fire Dampers 

B.1 Materials 

Ventilation ducts shall be of steel or equivalent material. Short ducts, however, not generally exceeding 2 

m in length and with a cross-sectional area not exceeding 0.02 m 2 need not be non-combustible, subject 

to the following conditions: 

• these ducts shall be made of heat resisting non-combustible material, which by be faced internally 

and externally with membrances having low flame-spread characteristics and, in each case, a calorific 

value not exceeding 45 MJ/m 2 of their surface area for the thickness used 

• they may only be used at the end of the ventilation device 

• they shall not be situated less than 600 mm, measured along the duct, from where it penetrates any 

"A" or "B" class division including continuous "B" class ceilings 

–––––––––––––– 

1 Cold service is understood to mean refridgration systems and chilled water piping for air-conditioning systems (MSC/Circ.1120) 





Section 7 

B.2 Ducts 


B.2.1 Where ventilation ducts with a cross-sectional area exceeding 0.02 m 2 pass through class "A" 

bulkheads or decks, the opening shall be lined with a steel sheet sleeve unless the ducts passing through 

the bulkheads or decks are of steel in the vicinity of penetrations through the deck or bulkhead, the ducts 

and sleeves at such places shall comply with the following: 

B.2.2 The ducts or sleeves shall have a thickness of at least 3 mm and a length of at least 900 mm. 

When passing through bulkheads, this length shall be divided preferably into 450 mm on each side of the 

bulkhead. 

These ducts, or sleeves lining such ducts, shall be provided with fire insulation. The insulation shall have 

at least the same fire integrity as the bulkhead or deck through which the passes. Equivalent penetration 

protection shall be provided to the satisfaction of GL. 

B.2.3 Ducts with a cross-sectional area exceeding 0.075 m 2 , except those serving hazardous areas, 

shall be fitted with fire dampers in addition to meeting the requirements of B.2.2. The fire damper shall 

operate automatically but shall also be capable of being closed from both sides of the bulkhead or deck. 

The damper shall be provided with an indicator which shows whether the damper is open or closed. Fire 

dampers are not required, however, where ducts pass through spaces without serving these spaces, 

provided those ducts have the same fire integrity as the divisions which they pierce. GL may, given special 

considerations, permit operation from one side of a division only. 

B.2.4 A full cross-sectional area of a duct is to be considered for the above requirements. Splitting of 

ducts before the penetration and merging afterwards does not relax the requirements. 

B.3 Ventilation of machinery spaces, galleys and hazardous areas 

B.3.1 Ducts provided for the ventilation of machinery spaces of category "A", galleys and hazardous 

areas shall not pass through accommodation spaces, service spaces or control stations. However, GL 

may permit a relaxation from this requirement, except for the ducts serving hazardous areas provided 

that: 

B.3.2 Ducts are constructed of steel having a thickness of at least 3 mm for ducts of 300 mm in 

width or less and of at least 5 mm for ducts of 760 mm in width and over; in the case of ducts the width or 

diameter of which is between 300 mm and 760 mm, the thickness shall be obtained by interpolation. 

B.3.3 

Ducts are fitted with automatic fire dampers close to the boundaries penetrated, and 

B.3.4 Ducts are insulated in "A-60" standard from the machinery spaces or galleys to a point at least 

5 m beyond each fire damper. 

Or alternatively: 

B.3.5 

Ducts are constructed of steel in accordance with B.3.2. 

B.3.6 Ducts are insulated to "A-60" standard throughout the accommodation spaces, service spaces 

or control stations. 

B.4 Ventilation of accommodation spaces, service spaces or control stations 

B.4.1 Ducts provided for the ventilation of accommodation spaces, service spaces or control stations 

shall not pass through machinery spaces of category A, galleys or hazardous areas. However, GL may 

permit a relaxation from this requirement, except for the ducts passing through hazardous areas, provided 

that: 

B.4.2 The ducts where they pass through a machinery space of category A or a galley are constructed 

of steel in accordance with B.3.2. 

B.4.3 

Automatic fire dampers are fitted close to the boundaries penetrated. 





Section 7 


B.4.4 The integrity of the machinery space or galley boundaries is maintained at the penetrations. 

Or alternatively: 

B.4.5 The ducts where they pass through a machinery space of category A or a galley are constructed 

of steel in accordance with B.3.1. 

B.4.6 

Ducts are insulated to "A-60" standard within the machinery space or galley. 

B.5 Ducts passing "B" class bulkheads 

Ventilation ducts with a cross-sectional area exceeding 0.02 m 2 passing through "B" class bulkheads 

shall be lined with steel sheet sleeves of 900 mm in length divided preferably into 450 mm on each side of 

the bulkhead unless the duct is of steel for this length. 

B.6 Ducts from galley ranges 

Where they pass through accommodation spaces or spaces containing combustible materials, the exhaust 

ducts from galley ranges shall be of equivalent fire integrity to "A" class divisions. Each such exhaust 

duct shall be fitted with: 

• a grease trap readily removable for cleaning 

• a fire damper located in the lower end of the duct and in addition a fire damper in the upper end of 

the duct 

• arrangements, operable from within the galley, for shutting off the exhaust fans, and 

• fixed means for extinguishing a fire within the duct. 

B.7 Inlets and outlets 

The main inlets and outlets of all ventilation systems shall be capable of being closed from outside the 

spaces being ventilated. 

B.8 Power ventilation 

Power ventilation of accommodation spaces, service spaces, control stations, machinery spaces and 

hazardous areas shall be capable of being stopped from an easily accessible position outside the space 

being served. The accessibility of this position in the event of a fire in the spaces served shall be specially 

considered. 

The means provided for stopping the power ventilation serving machinery spaces or hazardous areas 

shall be entirely separate from the means provided for stopping ventilation of other spaces. 

B.9 Accommodation spaces and control stations 

• The ventilation of the accommodation spaces and control stations shall be arranged in such a way 

as to prevent the ingress of flammable, toxic or noxious gases or smoke from surrounding areas. 





Section 8 


Section 8 



B Arrangements in Machinery Spaces and Spaces Containing Fired Processes ......... 8-2 

C Arrangements in Spaces Containing Large Oil Filled Electrical Equipment............... 8-2 

D Additional Requirements for Specific Lockers and Galley Facilities........................... 8-3 

E Water Fire Extinguishing Systems.............................................................................. 8-3 

F Foam Fire Extinguishing Systems .............................................................................. 8-6 

G Fixed Gas Fire Extinguishing Systems ....................................................................... 8-8 

H Portable Fire Extinguishers and Fireman's Outfit ..................................................... 8-13 

A 


A.1 Scope 

The purpose of fire-fighting system (Active Fire Protection) is to provide quick and reliable means for 

fighting fires and mitigate explosion effects. They have to be installed in areas where the major fire risk 

are present. 

Every offshore installation/unit shall be equipped with a general water fire extinguishing system in accordance 

with E and with portable and mobile extinguishers as specified in H. 

For helideck safety requirements incl. firefighting see Section 5, D. 

A.2 Fire-resistance of components in fixed fire-extinguishing systems 

Unless otherwise specified in this Section, piping, pipe fittings and related components except gaskets of 

fixed fire-extinguishing systems inside in the protected spaces shall be designed to withstand a temperature 

of 925 °C. 

A.3 Approval of fire-extinguishing appliances and equipment 

Approvals of Administrations or other Certifying Bodies if applicable to the specific application, are generally 

accepted for fire-fighting equipment and components such as fire-extinguishers, fire-hoses, foam 

concentrates, etc. 

A.4 Codes and standards 

Following codes and standards shall apply: 

• IMO – Code for the Construction and Equipment of Mobile Offshore Drilling Units (MODU Code) 

• SOLAS 

• IMO -International Code for -Fire Safety System (FSS Code) 

• ISO 13702 Petroleum and natural gas industries – Control and mitigation of fires and explosions on 

offshore production installations – Requirements and guidelines 

• ISO 1776 Petroleum and natural gas industries – Offshore production installations – Guidelines on 

tools and techniques for hazard identification and risk assessment 

• other international codes and standards can be agreed, such as VdS, NFPA or others 

• National Rules to be observed 





Section 8 


B 

Arrangements in Machinery Spaces and Spaces Containing 

Fired Processes 

B.1 Extinguishing equipment 

B.1.1 Spaces containing internal combustion machinery with a total power output of not less than 

750 kW, oil or gas fired boilers, heaters or incinerators of not less than 75 kW thermal rating, or spaces 

containing oil fuel units or settling tanks, shall be provided with one of the following fixed firefighting systems: 

• a pressure water spraying system 1 

• a CO 2 system or a system using an extinguishing gas other than CO 2 

• a high expansion foam system 

B.1.2 They are, in addition, to be furnished with one mobile foam type extinguisher of not less than 

45 litres capacity or equivalent and one approved portable foam extinguisher or equivalent for each 750 

kW of engine power output or part thereof. The total number of portable extinguishers shall not be less 

than 2 and need not exceed 6. 

B.1.3 Spaces containing oil or gas fired boilers or equivalent shall be furnished, in addition, with at 

least two approved portable foam extinguishers or equivalent in each space containing a fired process 

installation or part of the oil fuel installation, and at least one extinguisher of the same description with a 

capacity of 9 liter for each burner, provided that the total capacity of the additional extinguishers need not 

exceed 45 litres for each space. 

B.2 Stopping of ventilating fans and pumps 

B.2.1 Means are to be provided for stopping ventilating fans serving machinery and working spaces, 

and for closing all doorways, ventilation ducts, annular spaces around funnels and other openings to such 

spaces. These means are to be capable of being operated from outside such spaces in case of fire. 

B.2.2 Machinery driving forced and induced draught fans, electric motor pressurization fans, fuel 

transfer pumps, fuel unit pumps and other similar fuel pumps are to be fitted with remote controls situated 

outside the space concerned, so that they may be stopped in the event of a fire arising in the space in 

which they are located. 

B.3 Fuel shut-off valves 

Every fuel suction pipe from a storage, settling or daily service tank is to be fitted with an independent, 

manual released shut-off valve close to the tank capable of being closed from outside the space concerned 

in the event of a fire occurring in the space in which such tanks are situated. 

C 

Arrangements in Spaces Containing Large Oil Filled Electrical 

Equipment 

C.1 Extinguishing equipment 

C.1.1 Spaces containing oil immersed transformers, reactors or others, shall be provided with one of 

the following fixed fire fighting systems: 

• a pressure water spraying system 1 

• an inert gas system 

• a high expansion foam system 

–––––––––––––– 

1 Water mist systems which are type approved in accordance with MSC/Circ.1165 may be used. 





Section 8 


C.1.2 Spaces containing oil immersed transformers or reactors are, in addition, to be furnished with one 

mobile CO 2 type extinguisher of not less than 45 kg capacity or equivalent and one approved portable 

CO 2 extinguisher or equivalent. The total number of portable extinguishers shall not be less than 2 and 

need not exceed 6. 

C.2 Stopping of ventilating fans, pumps and energy supply 

C.2.1 Means are to be provided for stopping ventilating fans serving such spaces, and for closing all 

doorways, ventilation ducts, annular spaces around funnels and other openings to such spaces. These 

means are to be capable of being operated from outside such spaces in case of fire. 

The high voltage facilities shall be de-energized before the beginning of fire fighting. 

D 

Additional Requirements for Specific Lockers and Galley Facilities 

For paint lockers or similar flammable liquid lockers and galley range exhaust ducts or deep-fat cooking 

facilities, specific fire-extinguishing systems shall be provided in acc. to international rules and appropriated 

approval certifications. 

E 

Water Fire Extinguishing Systems 

E.1 Fire water system 

E.1.1 

Fire pumps 

E.1.1.1 At least two independently driven power pumps have to be provided, each arranged to draw 

directly from the sea or a tank and discharge into a fixed fire main. However in cases with high suction 

lifts, booster pumps and storage tanks may be installed, provided such arrangements will satisfy all the 

requirements of E.1.1.1 to E.1.1.10. At least one of the required pumps is to be dedicated to firefighting 

duties only and shall be available for such duties at all times and shall be also connected to the emergency 

power supply. 

E.1.1.2 The pumps, their power supply and the associated pipes and valves are to be so arranged 

throughout for the platform that a fire in any space does not compromise the proper function of all the fire 

pumps. 

E.1.1.3 Each pump shall be capable of delivering at least one jet simultaneously from each of any two 

fire hydrants, hoses and 19 mm nozzles while maintaining a minimum pressure of 0.35 N/mm 2 at any 

hydrant. 

In addition, where a foam system is provided for protection of the helicopter deck, the pump shall be capable 

of maintaining a pressure of 0.7 N/mm 2 at the foam installation. If the water consumption for any 

other fire protection or fire-fighting purpose should exceed the rate of the helicopter deck foam installation, 

this consumption shall be the determining factor in calculating the required capacity of the fire 

pumps. 

E.1.1.4 The capacity of the required pumps shall be appropriate to the firefighting services supplied 

from the fire main. The capacity of each pump is not to be less than 70 m 3 /h. It shall be possible to operate 

the fire-water pumps engines when the ventilation to the rooms has been shut-off. 

E.1.1.5 Centrifugal pumps used as fire pumps are to be connected to the fire main by means of screwdown 

non-return valves or a combination of non-return and shut-off valve. 

E.1.1.6 Relief valves are to be provided in conjunction with all pumps connected to the fire main, if the 

pumps are capable of developing a pressure exceeding the design pressure of the fire main, hydrants 





Section 8 


and hoses. Closure of any single isolating valve or combination of isolating valves shall not leave any part 

of the main unprotected against overpressure. 

E.1.1.7 The water supply for the fire main should be drawn directly from the sea or a tank and only 

self-priming pumps shall be installed. However, in installations/ units with high suction lifts, booster pumps 

and intermediate storage tanks may be installed. 

E.1.1.8 Where either of the required pumps is located in a space not normally manned and relatively 

far away from working areas, provisions are to be made for remote start-up of the pump and remote operation 

of associated suction and discharge valves. 

E.1.1.9 Except as provided in E.1.1.1, sanitary, bilge or general service pumps may be accepted as 

fire pumps, provided that they are not normally used for pumping oil. 

E.1.1.10 

E.1.2 

E.1.2.1 

Fire pumps shall start automatically when there is a pressure drop in the firewater main. 

Fire mains 

A fixed fire main shall be provided. 

E.1.2.2 The diameter of the fire main and water service pipes shall be sufficient for the effective distribution 

of the maximum required discharge from the required fire pumps operating simultaneously. 

E.1.2.3 With the required fire pumps operating simultaneously, the pressure maintained in the fire 

mains shall be adequate for the safe and efficient operation of all equipment supplied therefrom. 

E.1.2.4 The fire main is to be routed clear of hazardous areas as far as practicable and be arranged in 

such a manner as to make maximum use of any thermal shielding or physical protection afforded by the 

structure of the unit. 

E.1.2.5 The fire main shall be provided with isolating valves located so as to permit optimum utilization 

in the event of physical damage to any part of the main. 

E.1.2.6 

The fire main shall not have connections other than for fire-fighting purposes. 

E.1.2.7 All practical precautions should be taken to protect the fire main against freezing, in order to 

have water readily available. 

E.1.2.8 Materials readily rendered ineffective by heat shall not be used for fire mains and hydrants 

unless adequately protected. Hydrants shall be so placed that the fire hoses may be easily connected. 

E.1.2.9 A cock or valve is to be fitted to serve each fire hose so that any fire hose may be removed 

while the fire pumps are at work. 

E.1.3 

Monitors, hydrants, hoses and nozzles 

E.1.3.1 The unit or installation shall be equipped with a sufficient number of strategically located hydrants, 

hose stations, fire hose reels and monitors. 

E.1.3.2 Monitors 

Monitors shall be installed, if applicable depending on designed hazardous areas. Details of monitors to 

be subject of relevant fire load of the hazardous area. 

E.1.3.3 Hydrants 

Hydrants are to be so distributed, that at least two water jets not emanating from the same hydrant can 

reach any point of the platform which would normally be accessible to the crew. One jet may be delivered 

by a single length of hose and the second by a joint hose length of not more than 30 m. 

E.1.3.4 Fire hoses 

Fire hoses shall be of an approved type and be sufficient in length to project a jet of water to any of the 

spaces in which they may be required to be used. Their maximum length should not exceed 15 m. For 

open decks, also length of fire hoses of 20 m are acceptable. 





Section 8 


Every fire hose shall be provided with a dual purpose nozzle and the necessary couplings, and together 

with any necessary fittings and tools be kept ready for use in appropriate positions near the water service 

hydrants or connections. 

Standardized couplings in acc. to national regulations shall be used. 

E.1.3.5 Nozzles 

Nozzles shall comply with the following requirements: 

• Standard nozzle sizes should be 12 mm, 16 mm and 19 mm or as near thereto as possible. Under 

special circumstances the use of larger nozzles may be considered. 

• For accommodation and service spaces, a nozzle size greater than 12 mm need not be used. 

• For machinery and exterior locations, the nozzle size shall be 19 mm. 

E.2 Fixed pressure water systems for firefighting and cooling 

E.2.1 

Deluge systems 

E.2.1.1 Areas, which require water protection, e.g. transformers or reactors should be covered by 

deluge systems. The deluge system shall discharge water through all nozzles at the same time and will 

be started automatically or manually by opening the deluge valve. 

The deluge system shall provide adequate coverage for the relevant fire and explosion scenarios, with 

respect to both volume and area coverage, horizontal and vertical surfaces. 

The deluge nozzles will receive water at design pressure not later than 30 s after a confirmed fire signal 

has been given. 

Where deluge systems are installed, the following requirements apply: 

E.2.1.2 

The nozzles are to be of an approved type. 

The number and arrangement of the nozzles is to be such as to ensure an effective average distribution 

of water of at least 5 l/m 2 per minute in the spaces to be protected. 

E.2.1.3 The system may be divided into sections, the distribution valves of which shall be operated 

from easily accessible positions outside the spaces to be protected, not likely to be cut off by a fire in the 

protected space. 

E.2.1.4 The system shall be kept charged at the necessary pressure up to the deluge valve and the 

pump supplying the water for the system shall be put automatically into action by a pressure drop in the 

system. 

E.2.1.5 The pump shall be capable of simultaneously supplying at the necessary pressure all sections 

of the system in any one compartment to be protected. The pump, its controls and deluge valves shall be 

installed outside the space or spaces to be protected. It shall not be possible for a fire in the space or 

spaces protected by the water spraying system to put the system out of action. 

E.2.1.6 The pump may be driven by an independent internal combustion engine but, if it is dependent 

upon power being supplied from the emergency generator, that generator shall be so arranged as to start 

automatically in case of main power failure, so that power for the pump required by E.2.1.5 is immediately 

available. When the pump is driven by an independent internal combustion engine, it shall be so situated 

that a fire in the protected space will not affect the air supply to the engine. 

E.2.1.7 Precautions shall be taken to prevent the nozzles from becoming clogged by impurities in the 

water or by corrosion of piping, nozzles, valves and pump. Carbon steel and galvanized steel shall not be 

used in the deluge system. 

E.2.1.8 Suitable provisions shall be made for the system to be tested without detracting from its operational 

efficiency or disrupting the operational routine of the installation. 

E.2.1.9 Upon use of the system, an audible and visual alarm is to be activated in the control centre, 

indicating the section affected. 





Section 8 


E.2.2 

Automatic sprinkler systems 

E.2.2.1 Every normally or intermittently manned offshore installation/ unit shall be provided with an 

automatic sprinkler system for the accommodation spaces. This system shall apply fire-extinguishing 

water through nozzles if heat is detected and is charged with pressurized water up to every nozzle. Only 

fire exposed nozzles will discharge water. 

E.2.2.2 Each sprinkler section is to be equipped with an detection device which, when a sprinkler is 

activated, actuates a visual and audible alarm at the control center, indicating the section concerned. A 

pressure gauge is to be provided at each section. 

Any electrical equipment shall be self-monitoring and each section shall be capable of being for water 

flow tested individually. 

E.2.2.3 Installations/units equipped with an automatic sprinkler system are to be additionally provided 

with a fire detection and alarm system with automatic smoke/heat detectors and manual call points with 

displays in the control room. 

E.2.2.4 Where sprinkler systems are installed in the accommodation and day rooms, the alarm devices 

are to conform to the following requirements: 

Automatic devices shall be mounted which give an audible and visual alarm as soon as a sprinkler is 

activated. 

Activation shall be indicated in the control room. With regard to the self-monitoring function, the alarm 

system is to be designed similarly to a fire detection system. 

E.2.2.5 The system is normally to be supplied by a pressurized fresh water system, capable, once 

actuated, of operating automatically for 30 minutes at a sufficient water pressure to enable it to operate 

efficiently. Other arrangements are to be approved on a case by case basis. 

E.2.2.6 In the event of a pressure drop in the system, a pressure water pump used solely for this purpose 

shall start up automatically before the pressure water tank has been exhausted. 

E.2.2.7 The pressure water tank and sprinkler pump are to be located in a safe area outside the 

spaces to be protected. 

E.2.2.8 

A changeover arrangement to a fire water main shall be provided. 

E.2.2.9 Piping shall be heat-resistant and shall be either inherently corrosion-resistant or be suitably 

protected against corrosion. 

E.2.2.10 

The spray nozzles are to be grouped into sections. 

They are to be so arranged, that not less than 5 l/m 2 /min is sprayed over the area to be protected. 

Inside the accommodation spaces the nozzles shall be activated within a temperature range of 68 °C to 

79 °C. 

The nozzles are to be made of corrosion-resistant material. Nozzles of galvanized steel are not permitted. 

F 

Foam Fire Extinguishing Systems 

F.1 Foam type 

Only approved foam concentrates are to be used. The systems shall be protected against freezing. 

F.2 High expansion foam 

High expansion foam systems for the protection of enclosed spaces are to be so designed, that the largest 

space to be protected can be filled with foam at the rate of at least 1 m depth per minute without allowance 

for machinery and equipment. The supply of foam solution shall be sufficient to fill completely at 

least 5 times the largest space to be protected. The expansion ratio of the foam shall not exceed 1000 : 1. 





Section 8 


F.2.1 Foam generator 

The foam generator with tanks, pipe system, ducts, etc. is to be permanently installed and shall be capable 

to attain full foam production within 2 minutes after fire alarm. 

The foam generator with equipment is to be placed in a safe area, separated from areas to be protected. 

If there is no access from the open deck, two separate means of access are to be provided. 

F.2.2 Foam ducts 

The foam ducts are to be dimensioned according to the size of the foam generator outlet, and are to be 

so located, that an even distribution of foam is obtained throughout the room to be protected. The ducts 

are to be made of steel and protected against corrosion. 

A shut-off device is to be fitted between the foam generator and the distribution system. 

F.3 Low expansion foam 

F.3.1 Enclosed spaces 

If low expansion foam is used for local protection in enclosed spaces, the system is to be so designed, 

that the largest area over which fuel can spread, can be covered within 5 minutes with a 150 mm thick 

layer of foam. The expansion ratio shall not exceed 12:1. 

F.3.2 

Exterior locations 

F.3.2.1 Fixed low-expansion foam systems for use in exterior locations shall be capable of supplying 

foam solution to the monitors and foam applicators at a rate which shall be at least the greater of the following 

quantities, but not less than 1250 l/min: 

1. 0.6 l/min per square meter of the total area to be protected 

2. 1.5 l/min per square meter of a circular area with the radius of 75 % of the nominal length of throw of 

the largest monitor provided. 

F.3.2.2 Foam capacity 

The supply of foam concentrate is to be sufficient for at least 30 minutes of operation of the system at 

maximum capacity as specified in F.3.2.1. 

F.3.2.3 Foam monitors 

Foam monitors are to be so arranged that the protected area can be covered from at least two monitors, 

which shall as far as practicable be located opposite to each other. 

F.3.3 Foam hydrants 

Foam hydrants are to be so arranged that any part of the protected area can be reached with at least one 

foam applicator and hose. 

One foam hydrant is to be arranged at the access to any area to be protected. The total of foam applicators 

available shall not be less than four. 

F.3.4 

Location of the system 

F.3.4.1 Foam storage tanks, associated pumps, proportioners and controls shall be located in a safe 

area not likely to be cut off in the event of a fire in a protected area. 

The system is to be designed for rapid readiness. 

F.3.4.2 In centralized systems shut-off valves are to be provided in order to isolate damaged sections 

of the foam main. 

F.4 Influence to water fire fighting 

The operation of the foam system shall not impair the simultaneous use of any water fire fighting installation 

required by these Rules. 





Section 8 


G 

Fixed Gas Fire Extinguishing Systems 

G.1 CO 2 fire extinguishing systems 

G.1.1 Initiation 

The system is to be arranged for manual initiation of release only. 

If, in addition to manual release option also an automatic release is provided, suitable measures have to 

be implemented and approved by GL to ensure that no personnel is present in the protected space when 

the gas is released. 

G.1.2 Design 

CO 2 cylinders, associated pressure components and piping shall be approved in respect of materials, 

design and manufacture. Special attention is to be paid to the risk of icing of quick-flooding lines. 

G.1.3 

Pipes 

G.1.3.1 The pipes for conveying the gas shall be provided with control valves so marked, as to indicate 

clearly the compartments to which the pipes are led. 

G.1.3.2 Wherever possible, welded pipe connections are to be used for CO 2 systems. For detachable 

connections which cannot be avoided and for valves and fittings, flanged joints are to be used. For pipes 

with a nominal bore of less than 50 mm, welded compression type couplings may be used. Threaded 

joints may be used only inside protected spaces. 

G.1.3.3 

All pipes are to be suitably protected against corrosion. 

G.1.3.4 In piping sections where valve arrangements introduce sections of closed piping (e.g. manifolds 

with distribution valves), such sections shall be fitted with a pressure relief valve and the outlet of the 

valve shall be led to the open deck. 

G.1.4 Valves and fittings 

Valves and fittings in the lines from the cylinders to the control valves have to be designed for a nominal 

pressure of 100 bar, the lines from the control valves to the nozzles for a nominal pressure of 40 bar. 

G.1.5 Nozzles 

Discharge nozzles and piping shall be arranged so as to provide effective distribution of gas. 

G.1.6 

Quantity of gas 

G.1.6.1 The quantity of gas carried shall be sufficient to give a minimum quantity of free gas equal to 

35 % of the entire volume of the largest space to be protected. 

If two or more adjacent spaces protected by CO 2 are not entirely separate, they shall be considered as 

forming one space. 

G.1.6.2 The calculation is to be based upon a gas volume of 0.56 m 3 per kg of CO 2 . 

G.1.6.3 The system is to be so designed that 85 % of the required gas can be discharged into the 

space within 2 minutes. 

G.1.7 

Gas storage 

G.1.7.1 Gas cylinder storage rooms or areas shall be situated at a safe and readily accessible position 

and be effectively ventilated in acc. to an applicable standard used for the design of the system. Any entrance 

to storage rooms should preferably be from the open deck and in any case shall be independent of 

the protected space. Access doors shall be gastight and open outward. Bulkheads and decks, which form 

the boundaries of such rooms, shall be gastight and adequately insulated to prevent a temperature exceeding 

45 °C inside the CO 2 room. Any of the boundaries which are contiguous with the protected space 

are to be A-60 Class divisions. 





Section 8 


G.1.7.2 Pressure relief devices associated with CO 2 cylinders, tanks or manifolds are to be so arranged, 

that when operated there will be no danger to personnel from the resultant discharge of CO 2 . 

G.1.7.3 Provision is to be made for changing the cylinders and checking the contents by weighing or 

by other approved means. 

G.1.8 Warning 

Means shall be provided for the automatic giving off audible and visual warning of the release of CO 2 gas 

into any space to which personnel normally has access. 

The alarm shall operate before the gas is released for a period of time suitable to evacuate the space to 

be flooded, but not less than 20 s. 

G.1.9 Control 

The means of control of any such fixed gas fire extinguishing system shall be readily accessible and simple 

to operate and shall be located in a release box in a safe area outside the protected space. Two controls 

shall be provided, one for opening the distribution valve and one for opening the CO 2 gas cylinders. 

G.1.10 Ventilation 

Means shall be provided for stopping automatically all ventilation fans and closing openings serving the 

protected spaces, before the medium is released. 

G.1.11 

Arrangement plan 

A general arrangement plan has to be exhibited in the Control Centre, the operating stations and the CO 2 

rooms, showing the arrangement of the CO 2 system. 

G.1.12 Warning signs 

Warning signs shall be displayed at the accesses to the CO 2 room and to spaces protected by the system. 

G.1.13 Tests 

After completion of the system, pressure and tightness tests in acc. to an applicable standard used for the 

design of the system and free passage tests have to be performed. 

G.2 Extinguishing systems using gases other than CO 2 

G.2.1 


G.2.1.1 Systems using extinguishing gases other than CO 2 shall be type approved in accordance with 

a standard acceptable to GL. 

G.2.1.2 No fire extinguishing gas shall be used which is carcinogenic, mutagenic or teratogenicity at 

concentrations expected during its use or which is not considered to be environmentally acceptable. 

No fire extinguishing gas shall be used in concentrations greater than the cardiac sensitization level 

NOAEL (No Observed Adverse Effect Level), without the use of the release arrangements and alarms as 

provided in G.2.6. 

In no case an extinguishing gas is permitted to be used in concentrations above its LOAEL (Lowest Observed 

Adverse Effect Level) nor its ALC (Approximate Lethal Concentration). 

G.2.1.3 

New installations of halogenated hydrocarbon (halon) systems are not permitted. 

G.2.1.4 For systems using halocarbon clean agents the system shall be designed for a discharge of 

95 % of the design concentration in not more than 10 s. 

For systems using inert gases, the discharge time shall not exceed 120 s for 85 % of the design concentration. 





Section 8 


G.2.2 

Calculation of the supply of extinguishing gas 

G.2.2.1 The supply of extinguishing gas shall be calculated based on the net volume of the protected 

space, at the minimum expected ambient temperature using the design concentration specified in the 

system's type approval Certificate. 

G.2.2.2 The net volume is that part of the gross volume of the space which is accessible to the free 

extinguishing gas including the volumes of the bilge and of the casing. Objects that occupy volume in the 

protected space shall be subtracted from the gross volume. 

G.2.2.3 The volume of free air contained in air receivers located in a protected space shall be added to 

the net volume unless the discharge from the safety valves is led to the open air. 

G.2.2.4 For systems with centralized gas storage for the protection of more than one space the quantity 

of extinguishing gas available need not be more than the largest quantity required for any one space 

so protected. 

G.2.3 

Gas containers 

G.2.3.1 Containers for the extinguishing gas or a propellant needed for the discharge shall comply in 

respect of their material, construction, manufacture and testing with the relevant Rules on pressure vessels. 

G.2.3.2 

The filling ratio shall not exceed that specified in the system's type approval documentation. 

G.2.3.3 Means are to be provided for the installation’s/ unit's personnel to safely check the quantity of 

medium in the containers. 

G.2.4 

Storage 

G.2.4.1 Centralized systems 

Gas containers in centralized systems are to be stored in a storage space complying with the requirements 

for CO 2 storage spaces, see G.1.7, with the exception that storage temperatures up to 55 °C are 

permitted, unless otherwise specified in the type approval Certificate. 

G.2.4.2 

Modular systems 

G.2.4.2.1 All systems covered by these requirements may be executed as modular systems (with the 

gas containers, and containers with the propellant if any, permitted to be stored within the protected 

space) provided the conditions of G.2.4.2.2 through G.2.4.2.9 are complied with. 

G.2.4.2.2 Inside a protected space, the gas containers shall be distributed throughout the space with 

bottles or groups of bottles located in at least six separate containers. Duplicate power release lines have 

to be arranged to release all bottles simultaneously. The release lines shall be so arranged that in the 

event of damage to any power release line, five sixth of the fire extinguishing gas can still be discharged. 

The bottle valves are considered to be part of the release lines and a single failure shall include also failure 

of the bottle valve. 

For systems that need less than six containers (using the smallest bottles available), the total amount of 

extinguishing gas in the bottles shall be such that in the event of a single failure to one of the release lines 

(including bottle valve), five sixth of the fire extinguishing gas can still be discharged. This may be 

achieved by for instance using more extinguishing gas than required so that if one bottle is not discharging 

due to a single fault, the remaining bottles will discharge the minimum five sixth of the required 

amount of extinguishing gas. This can be achieved with minimum two bottles. However, the NOAEL value 

calculated at the highest expected engine room temperature may not be exceeded when discharging the 

total amount of extinguishing gas simultaneously. 

Systems that cannot comply with the above (for instance where it is intended to locate only one bottle 

inside the protected space) are not permitted. Such systems shall be designed with bottle(s) located outside 

the protected space, in a dedicated room complying with the requirements for CO 2 storage spaces 

(see G.1.7). 





Section 8 


G.2.4.2.3 Duplicate sources of power located outside the protected space shall be provided for the release 

of the system and be immediately available, except that for machinery spaces, one of the sources 

of power may be located inside the protected space. 

G.2.4.2.4 Electric power circuits connecting the containers shall be monitored for fault conditions and 

loss of power. Visual and audible alarms shall be provided to indicate this. 

G.2.4.2.5 Pneumatic or hydraulic power circuits connecting the containers shall be duplicated. The 

sources of pneumatic or hydraulic pressure shall be monitored for loss of pressure. Visual and audible 

alarms shall be provided to indicate this. 

G.2.4.2.6 Within the protected space, electrical circuits essential for the release of the system shall be 

heat resistant, e.g. mineral-insulated cable or equivalent. 

Piping systems essential for the release of systems designed to be operated hydraulically or pneumatically 

shall be of steel. 

G.2.4.2.7 Not more than two discharge valves shall be fitted to any container. 

G.2.4.2.8 The containers shall be monitored for decrease in pressure due to leakage or discharge. Visual 

and audible alarms in the protected space and in the control station stand shall be provided to indicate 

this. 

G.2.4.2.9 Each container is to be fitted with an overpressure release device which under the action of 

fire causes the contents of the container to be automatically discharged into the protected space. 

G.2.5 

Piping and nozzles 

G.2.5.1 Wherever possible, pipe connections are to be welded. For detachable pipe joints, flange connections 

are to be used. For pipes with a nominal internal diameter of less than 50 mm threaded welding 

sockets may be employed. Threaded joints may be used only inside protected spaces. 

G.2.5.2 Flexible hoses may be used for the connection of containers to a manifold in centralised systems 

or to a rigid discharge pipe in modular systems. Hoses shall not be longer than necessary for this 

purpose and be type approved for the use in the intended installation. 

Hoses for modular systems are to be flame resistant. 

G.2.5.3 Only nozzles approved for use with the system shall be installed. The arrangement of nozzles 

shall comply with the parameters specified in the system's type approval Certificate, giving due consideration 

to obstructions. In the vicinity of passages and stairways nozzles shall be arranged such as to avoid 

personnel being endangered by the discharging gas. 

G.2.5.4 

The piping system shall be designed to meet the requirements stipulated in G.2.1.4. 

G.2.5.5 In piping sections where valve arrangements introduce sections of closed piping (manifolds 

with distribution valves), such sections shall be fitted with a pressure relief valve and the outlet of the 

valve shall be led to the open deck. 

G.2.6 

Release arrangements and alarms 

G.2.6.1 The system is to be designed for manual release only. 

If, in addition to manual release option also an automatic release is provided, suitable measures have to 

be implemented and approved by GL to ensure that no personal is present in the protected space when 

the gas is released. 

The controls for the manual release are to be arranged in lockable cabinets (release stations), the key 

being kept conspicuously next to the release station in a locked case with a glass panel. Separate release 

stations are to be provided for each space which can be flooded separately. The release stations shall be 

arranged near to the entrance of the protected space and shall be readily accessible also in case of a fire 

in the related space. Release stations shall be marked with the name of the space they are serving. 

G.2.6.2 Centralized systems shall be provided with additional means of releasing the system from the 

storage space. 





Section 8 


G.2.6.3 The mechanical ventilation of the protected space is to be stopped automatically before the 

discharge of the extinguishing gas. 

G.2.6.4 Audible and visual alarms shall be provided in the protected space and additional visual 

alarms at each access to the space. 

G.2.6.5 The alarm shall be actuated automatically by opening of the release station door. For installations 

with a design concentration in excess of the NOAEL, see G.2.1.3, means shall be provided to safeguard 

that the discharge of extinguishing gas is not possible before the alarm has been actuated for a 

period of time necessary to evacuate the space but not less than 20 s. 

G.2.6.6 Audible alarms shall be of horn or siren sound and be clearly distinguishable from other audible 

signals. 

G.2.6.7 

power. 

Electrical alarm systems shall have power supply from the main and emergency source of 

G.2.6.8 For the use of electrical alarm systems in gas dangerous zones refer to GL Rules for 

Instrumentation (IV-7-6). 

G.2.6.9 Where pneumatically operated alarms are used the permanent supply of compressed air is to 

be safeguarded by suitable arrangements. 

G.3 Tightness of the protected space 

G.3.1 Apart from being provided with means of closing all ventilation openings and other openings in 

the boundaries of the protected space, special consideration shall be given to G.3.2 through G.3.4. 

G.3.2 

G.3.3 

A minimum agent holding time of 15 min shall be provided. 

The release of the system may produce significant over pressurization in the protected space. 

G.3.4 Escape routes which may be exposed to leakage from the protected space shall not be rendered 

hazardous during or after the discharge of the extinguishing gas. Control stations and other locations 

that require manning during a fire situation shall have provisions to keep the concentrations of products 

below values considered hazardous for the required duration of exposure. 

G.4 Warning signs and operating instructions 

G.4.1 Warning signs are to be provided at each access to and within a protected space as appropriate: 

• "WARNING! This space is protected by a fixed gas fire extinguishing system using .......... Do not enter 

when the alarm is actuated!" 

• "WARNING! Evacuate immediately upon sounding of the alarm of the gas fire extinguishing system." 

G.4.2 

Brief operating instructions are to be posted at the release stations. 

G.4.2.1 A comprehensive manual with the description of the system and maintenance instructions is to 

be provided. The manual shall contain an advice that any modifications to the protected space that alter 

the net volume of the space will render the approval for the individual installation invalid. In this case 

amended drawings and calculations have to be submitted to GL for approval. 

G.5 Documents 

Prior to commencing of the installation the following documents are to be submitted to GL for approval: 

• arrangement drawing of the protected space showing machinery, etc. in the space, and the location 

of nozzles, containers (modular system only) and release lines as applicable 

• list of volumes deducted from the gross volume 

• calculation of the net volume of the space and required supply of extinguishing gas 





Section 8 


• isometrics and discharge calculations release schematic 

• drawing of the release station and of the arrangement in the installation/unit 

• release instructions for display at the release station 

• drawing of storage space (centralized systems only) 

• alarm system schematic 

• parts list 

• manual on board of unit or on installation 

G.6 Testing 

After completion of the system, pressure and tightness tests in acc. to an applicable standard used for the 

design of the system and free passage tests have to be performed. 

H 

Portable Fire Extinguishers and Fireman's Outfit 

H.1 Portable and mobile fire extinguishers 

H.1.1 General 

Water, dry powder, CO 2 or foam should be used as extinguishing agents for the portable and mobile fire 

extinguishers to be provided. 

Portable extinguishers shall on principle also be suitable for fighting fires in electrical installations. 

Water extinguishers may be used in accommodation spaces. 

H.1.2 

Capacity 

H.1.2.1 The capacity is limited by the following requirements: 

• the capacity of required portable fluid extinguishers is to be not more than 13.5 liters and not less 

than 9 liters 

• the weight of the charge in dry powder and gas filled portable extinguishers shall be at least 5 kg 

• the total weight of a single portable extinguisher ready for use shall not exceed 23 kg 

• mobile extinguishers shall be designed for a standard dry powder charge of 50 kg or for a foam solution 

content of 45 or 135 liters 

H.1.2.2 Spare charges are to be provided for each portable extinguisher capable of being recharged. 

One spare extinguisher is to be provided for each portable extinguisher which cannot be recharged on the 

installation/unit. 

H.1.3 

Location 

H.1.3.1 With regard to the number and the recommendations for the location of portable and mobile 

extinguishers, the following has to be observed: 

a) at least one portable extinguisher has to be located in every division enclosed by fire bulkheads; 

b) one of the portable extinguishers to be provided in any space has to be located at the access to such 

space; 

c) for small spaces the number of portable extinguishers may be reduced; 

d) portable CO 2 extinguishers shall not be located in accommodation spaces. 

At least two portable CO 2 extinguishers have to be provided in the vicinity of electrical installa- 

H.1.3.2 

tions. 

H.1.3.3 For the accommodation area, the distance between extinguishers shall not be more than 20 

m, and at least one extinguisher shall be provided on each level. 





Section 8 


Table 8.1 

Firefighting systems and equipment 

Areas and spaces to protected 

Permanently installed fire extinguishing 

systems 

CO 2 

Pressure water 

spraying system 

Foam system 

Connect. of firehoses 

Portable and mobile extinguishing 

equipment 

portable mobile 

Dry powder, 5 

kg 

CO2 

Dry powder, 

50 kg 

Foam, 45 liters 

Machinery spaces with 

internal combustion 

engines total outputs: 

Boiler rooms 

Spaces with 

electrical machinery, 

total output: 

< 750 kW 2 1 

> 360 kW 1 dry 

powder or 1 foam 

≥ 750 kW CO 2 or pressure water min. 2 

1 

system or high expansion 

1 dry powder or 

foam system 

2 

1 foam 

≥ 1.000 kW 

< 1.000 kW 

Oil filled equ.: CO 2 or deluge 

or foam 

min. 2 

3 2 1 

3 2 

Spaces for emergency diesels, aux. 

Diesel with > 750 kW 

CO 2 or pressure water system 

1 

Store rooms and galleys 

Galley: CO 2 in the hoods 

about stoves 

1 

1 in 

galley 

Acomodation areas 

Automatic sprinkler system 

1 every 

20 m + 

at each 

exit 

Control rooms with radio or electrical 

switchgear 

1 2 

Motor lifeboats 1 x 6 kg 

H.2 Fireman's outfits 

H.2.1 Type of outfit 

Each fireman’s outfit shall consist of at least: 

a) breathing apparatus of an approved type which may be either: 

• a smoke helmet or smoke mask which shall be provided with a suitable air pump and a length of air 

hose sufficient to reach from the open deck, well clear of doorway to any part of the machinery 

spaces. If, in order to comply with these Rules, an air hose exceeding 36 m in length would be necessary, 

a self-contained breathing apparatus shall be substituted or provided in addition as determined 

by GL, or 

• a self-contained compressed-air-operated breathing apparatus, the volume of air contained in the 

cylinders of which shall be at least 1200 l, or other self-contained breathing apparatus which shall be 

capable of functioning for at least 30 minutes. 

At least two spare fillings have to be provided for each breathing apparatus. 

b) a fire proof lifeline of sufficient length and strength, capable of being attached by means of a snaphook 

to the harness of the breathing apparatus or to a separate belt in order to prevent the breathing 

apparatus becoming detached when the lifeline is operated; 





Section 8 


c) protective clothing of material to protect the skin from the heat radiating from the fire and from burns 

and scalding by steam. The outer surface shall be water resistant; 

d) boots and gloves of rubber or other electrically non-conducting material; 

e) a rigid helmet providing effective protection against impact; 

f) an electric safety lamp (hand lantern) of approved type with a capacity for at least three hours; 

g) an axe with high-voltage insulation to the satisfaction of GL. 

H.2.2 Number 

At least two fireman’s outfits shall be provided. 

H.2.3 Storage 

The fireman’s outfits have to be stored in a safe area, readily accessible and ready for use, in at least two 

locations as far apart from each other as practicable. 

H.2.4 Communication 

For internal communication one portable VHF radio set for each set of fireman’s equipment, for the fire 

fighting supervisor, the technical supervisor and the safety control center are to be provided. 





Section 9 


Section 9 



B Manual Alarm.............................................................................................................. 9-2 

C Arrangement of Fire Detectors and Alarm Loops ....................................................... 9-2 

D Public Address and General Alarm System................................................................ 9-3 

A 


A.1 Fire detection system 

A.1.1 Every offshore installation/unit shall be provided with an automatic fire detection and alarm 

system for all accommodation and service spaces. 

The following types of fire detectors / detection units may be used in different locations on the substation: 

• ionization/smoke detectors for all enclosed operating areas, store rooms sleeping quarters, stairways, 

passageways and escapes within accommodation areas 

• heat detectors, preferably in galleys and day rooms 

• differential and flame detectors for operating areas subject to high air speeds and for areas on the 

open deck 

• Aspirating smoke detection systems with assigned detection units and sampling pipes in those areas, 

where other detector types are not recommended, e.g. for reasons of easy test and maintenance, 

i.e. in high rooms such as High Voltage Switchgear rooms. 

A.1.2 

For details concerning arrangement and layout of fire detectors refer to C further below. 

A.1.3 Eventually, a dedicated Closed Circuit TV system (CCTV) should be installed additionally for 

remote surveillance. 

A.2 Gas detection system 

A.2.1 A fixed automatic gas detection and alarm system may be required depending on the detailed 

design of an Offshore Wind Farm Substation. Such gas detection system is to be so arranged as to monitor 

continuously all areas where an accumulation of flammable gas or explosive gas mixture could occur. 

An accumulation of hazardous gas on an Offshore Wind Farm Substation may e.g. be possible in the 

following locations, as applicable: 

• in battery rooms (H2 generation due to faulty batteries or chargers) 

• in locations with Hypochlorite Generation Plants (if H2 leakage is possible due to the design) 

• in paint stores 

• in fuel tanks or at fuel tank openings, depending on the flashpoint of the respective fuel stored 

• at Helicopter refueling units 

• in ventilation outlets from above hazardous area spaces 

Depending on their location, it may be also required to install gas detectors in intakes for ventilation air, 

e.g. in living quarters or emergency shelters. 

A.2.2 Additionally, the possibility of an SF6 leakage in the MV/HV switchgear rooms should be taken 

into account. Such gas is used as an insulator in gas insulated switchgear (GIS). 

SF6 is normally non-toxic and odorless, however, it is known as the strongest greenhouse gas and toxic 

fluoride compounds could develop from SF6 during long term operation of the GIS. 





Section 9 


Rooms located underneath the GIS rooms which are not properly segregated from or sealed to the GIS 

room shall be sufficiently ventilated during attendance of personnel, as SF6 is heavier than air and will 

replace breathable air in case of a major leakage after a release to lower locations/decks. 

For the above reasons, any leakage or loss of SF6 shall be avoided and SF6 containments are to be 

appropriately monitored during operation or maintenance with suitable technical measures, e.g. Gas sensors, 

SF6 leakage/pressure monitoring, etc. 

National regulations concerning safe SF6 handling shall be observed (e.g. BGI 753 for Germany). 

A.2.3 Concerning the arrangement of Gas Sensors, the specific properties of the Gases to be detected 

shall be observed, e.g. Hydrogen is very fugitive and will accumulate right underneath the ceilings, 

as being much lighter than air. 

A.3 Fire & gas alarm system 

The Fire and Gas Detection and Alarm systems shall be capable of indicating at the main control station 

by audible and visual means the presence and location of a fire and an accumulation of hazardous gas. 

Fire and Gas Alarms shall be also transmitted to the Onshore Control Room to facilitate consecutive action, 

especially in the case of normally unmanned Offshore Substations. 

A.4 Equipment 

For technical details of fire or gas sensors and controllers as well as public address and general alarm 

system components, please refer to GL Rules for Instrumentation (IV-7-6), Section 1. 

B 

Manual Alarm 

B.1 Manual fire alarm 

B.1.1 Sufficient manual fire alarm stations (Manual Call Points, MAC’s) shall be fitted at suitable 

locations throughout the installation/unit. The locations of MAC’s shall include the exits from day rooms, 

stairways, control stations, passageways and escapes. 

B.1.2 

The distance between MAC’s shall not exceed 20 m wherever possible. 

B.1.3 If MAC’s are not sufficiently well lit by emergency lighting close-by, they are to be provided 

with an indicator lamp. 

B.1.4 

Manual Call Points may be part of a fire detection loop (see C.6, below). 

B.2 Man-overboard alarm 

Additionally to the Manual Call Points, Man-overboard alarm pushbuttons shall be installed at suitable 

locations on open deck areas on the Offshore Substation. 

C 

Arrangement of Fire Detectors and Alarm Loops 

C.1 Every alarm loop shall not cover more than one fire zone and, as far as practicable, not more 

than one deck or a stairway connecting more than two decks. 

C.2 Where there are arrangements for the separate flooding with fire extinguishing media of two or 

more adjoining spaces, separate fire alarm loops have also to be provided. 

C.3 A fire alarm section monitoring a service area or an accommodation area shall not include a 

machinery space of category A. 





Section 9 


C.4 For areas provided with automatic pressure water spray systems, separate alarm loops per 

section are to be allocated. 

C.5 Generally the number of the detectors shall not exceed 20 per alarm loop. The number of detectors 

grouped in each loop within a machinery space should not exceed 10. 

C.6 Manually actuated alarms, i.e. Manual Alarm Call points (MAC), may be incorporated in a loop 

together with automatic alarms. 

C.7 The arrangement and number of fire detectors have to be such that all areas with an increased 

fire risk are covered. This applies in particular to Transformer and Reactor rooms/areas, Medium 

and High Voltage Switchgear Rooms, Machinery spaces (e.g. Generator enclosures/rooms and control 

and working spaces). 

C.8 Detectors should not be mounted close to ventilation outlets or in positions where the flow of 

air may affect their operation, or where they are liable to suffer mechanical damage. 

C.9 Ceiling-mounted detectors shall normally be located at least 0.5 m from walls. 

C.10 The maximum distance between detectors (and the maximum area monitored) shall not exceed 

the following figures: 

• for heat detectors: 9 m (37 m 2 ) 

• for smoke detectors: 11 m (74 m 2 ) 

The distance from walls shall not exceed 

• for heat detectors: 4.5 m 

• for smoke detectors: 5.5 m 

C.11 The installation of a type tested aspirating smoke detection (ASD) system can be approved by 

GL. The arrangement and setup of an ASD system shall be such that a detected fire can be clearly assigned 

to a fire zone. 

Concerning the arrangement and dimensioning of the sampling pipes of the ASD system the manufacturer 

requirements shall be strictly followed. 

D 

Public Address and General Alarm System 

D.1 Public address system 

D.1.1 In addition to the general emergency alarm a public address (PA) system is generally required 

on all normally or temporarily manned Offshore Substations. The PA system shall be operable from strategically 

important locations and from the central control station. It shall be audible throughout the accommodation 

area, at the crew’s normal working places and at the strategically important locations. 

D.1.2 If the public address system is used to transmit the general emergency alarm (PA/GA system), 

the following requirements shall be fulfilled: 

• The requirements for the general emergency alarm shall be satisfied. 

• At least two amplifiers are to be provided, each of them separately supplied and fused. 

• At least two loudspeaker circuits, supplied from separate amplifiers, are to be installed in each fire 

zone, respectively in its subdivisions. 

• The loudspeaker circuits are to be so arranged that transmission at a reduced loudness is maintained 

in the event of a failure of an amplifier or loudspeaker circuit. 

• Where loudspeakers with built-in volume controls are used, the volume controls must be disabled by 

the release of the alarm signal. 





Section 9 


• It shall be possible to transmit the undistorted and clearly audible alarm signal at all times. Other simultaneous 

transmissions must be automatically interrupted. 

• It shall be possible to operate all loudspeakers at the same time. 

• The loudspeaker system shall be designed under observance of the minimum required sound level. 

• Announcement via microphone shall be free of acoustical feedback and other disturbances. 

D.1.3 The installation of a public address system may be dispensed for normally unmanned OSS. In 

such case, the operator is responsible to provide suitable communication equipment to the crew for internal 

communication during the temporary attendance on the installation, e.g. wireless radio. 

Please refer also to GL Rules for Instrumentation (IV-7-6), Section 2. 

D.2 General alarm system 

D.2.1 On all units or installations an alarm system shall be provided to alert the crew or to call them 

to the assembly points. It shall be possible to release the alarm from the central control station and also 

from strategically important locations. 

D.2.2 Generally, the following alarms shall be established: 

• general emergency alarm 

• fire alarm 

• gas alarm, if required according to A.2.1and A.2.2 

• abandon unit/installation 

The alarms shall be defined in an alarm philosophy document, which shall be submitted for certification. 

D.2.3 The elements of the alarm system have to be designed independently, but shall be connected 

by a bus system. The use of a common control panel is permitted. 

D.2.4 Means for announcement shall be provided in a sufficient number to ensure that all persons 

inside the installation/unit and on deck are alerted. In noisy rooms, additional visual means of alarm may 

be necessary. 

D.2.5 Once released, the alarm shall sound continuously until it is switched off manually or is temporarily 

interrupted for an announcement through the public address system. 

D.2.6 Cables for general emergency alarm installations and for loudspeaker systems shall be fireresistant 

according to IEC 60331. 

D.2.7 If the main electrical power source fails, the general emergency alarm system shall be fed by 

the emergency power source (uninterruptible power supply fed by the emergency generator).

(IV-7-3) General Safety

Create successful ePaper yourself

Delete template?

Save as template?