(IV-7-3) General Safety

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Rules IV Industrial Services Part 7 Offshore Technology Chapter 3 General Safety Section 8 Active Fire Protection 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 Edition 2013 Germanischer Lloyd Page 8–12
Rules IV Industrial Services Part 7 Offshore Technology Chapter 3 General Safety Section 8 Active Fire Protection • 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. Edition 2013 Germanischer Lloyd Page 8–13
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(IV-7-3) General Safety

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