(IV-7-3) General Safety

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Rules IV Industrial Services Part 7 Offshore Substations Chapter 3 General Safety Section 5 Access and Transfer 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 Edition 2013 Germanischer Lloyd Page 5–6
Rules IV Industrial Services Part 7 Offshore Substations Chapter 3 General Safety Section 5 Access and Transfer 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; Edition 2013 Germanischer Lloyd Page 5–7
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(IV-7-3) General Safety

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