(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 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. Edition 2013 Germanischer Lloyd Page 8–4
Rules IV Industrial Services Part 7 Offshore Technology Chapter 3 General Safety Section 8 Active Fire Protection 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. Edition 2013 Germanischer Lloyd Page 8–5
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(IV-7-3) General Safety

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