Iranian Classification Society Rules
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Section 3 Fire Extinction
301. Water supply systems
1. At least two water supply sources (sea chests, valves, strainers and pipes) are to be provided and so arranged that one supply source failure will not put all supply sources out of action.
3. A fixed water spray system is to be provided to protect drilling area. The minimum water ap- plication rate is not less than 20.4 m -min , or
3. A suitable fixed foam system is to be provided. The system is to be capable of delivering foam solution at a rate of not less than 6.5 m -min (4.1 m -min for Aqueous Film Forming Foam or Film-Forming Fluoroprotein Foam) for 15 minutes. Alternatively, a gas fixed fire ex- tinguishing system may be used for enclosed mud processing spaces.
1. Spaces having a fire risk, in principle, are to be provided with an automatic fire detection and alarm system.
3. The fire detection main indicator board is to be at a manned control station and is to be clearly to indicate where fire has been detected.
Detection systems using only thermal detectors, in general, are not to be permitted.
Sufficient manual fire alarm stations are to be installed throughout the accommodation spaces, service spaces and control stations. One manually operated call point is to be located at each exit. Manually operated call points are to be readily accessible in the corridors of each deck such that no part of the corridor is more than 20 m from a manually operated call point. Measures are to be taken to prevent inadvertent operation of the manual call alarm system.
(6) Ventilation intakes of enclosed machinery spaces contiguous to hazardous areas and contain- ing internal combustion engines and boilers; and
2. Low level alarm set at 10 ppm and high level alarm set not higher than 300 ppm are to be designed. The high level alarm is to activate an evacuation alarm. If the alarm at the main control point is unanswered within 2 minutes, the toxic gas (hydrogen sulphide) alarm and the helideck status light is to be automatically activated.
1. A self-contained breathing apparatus (SCBA) positive-pressure/pressure-demand breathing equip- ment with full-face piece and rated for a minimum of 30 minutes is to be provided for each person in working areas where hydrogen sulphide may be encountered, and each person in other areas is to be provided with a SCBA rated for a minimum of 15 minutes, or;
(2) Muster/evacuation area;
(4) Mud processing areas; and
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