(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 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. Edition 2013 Germanischer Lloyd Page 8–6
Rules IV Industrial Services Part 7 Offshore Technology Chapter 3 General Safety Section 8 Active Fire Protection 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. Edition 2013 Germanischer Lloyd Page 8–7
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(IV-7-3) General Safety

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