3. The arrangement of fire fighting systems in fuel cells spaces, and the need for water spray for cooling of fuel cells or other components must be evaluated and approved by the Society for each installation.

202. Fire Protection

1. Gas tanks or tank batteries located above deck are to be shielded with class A-60 insulation to- wards accommodation, service stations, cargo spaces and machinery spaces.

2. The tank room boundaries and ventilation trunks to such spaces below the bulkhead deck are to be constructed to class A-60. However, where the room is adjacent to tanks, voids, auxiliary machi- nery spaces of little or no fire risk, sanitary and similar spaces, the insulation standard may be re- duced to class A-0.

3. The fire and mechanical protection of gas pipes lead through ro-ro spaces on open deck is to be subject to special consideration by the Society depending on the use and expected pressure in the pipes. Gas pipes lead through ro-ro spaces on open deck are to be provided with guards or bol- lards to prevent vehicle collision damage.

4. The bunkering station is to be separated by class A-60 divisions towards other spaces, except for spaces such as tanks, voids, auxiliary machinery spaces of little or no fire risk, sanitary and similar spaces where the insulation standard may be reduced to class A-0.

5. A FC space is to as a minimum have gas tight steel bulkheads.

6. The categorization of the FC space as a machinery space of category A or other machinery space is depending on the amount of combustible material or fuel available in the space. The categories for the FC spaces have to be decided for each installation.

203.

Fire extinction

1. Fire main

(1) The water spray system required below may be part of the fire main system provided that the required fire pump capacity and working pressure is sufficient to operation of both the required numbers of hydrants and hoses and the water spray system simultaneously.

(2) When the storage tank is located on open deck, isolating valves are to be fitted in the fire main in order to isolate damage sections of the main.

2. Water spray systems

(1) A water spray system is to be fitted for cooling and fire prevention and to cover exposed parts of gas storage tank located above deck.

(2) 1T0heℓsy/msteinm/mis² tfoor bheoridzeosnigtanledprotjoectceodvesrurfaallceasreaansd 4asℓsp/mecinif/imed² faobrovveertiwcaitlhsuarnfacaepsp. lication rate of

(3) For the purpose of isolating damage sections, stop valves are to be fitted at least every 40 m or the system may be divided into two or more sections with control valves located in a safe and readily accessible position not likely to be cut-off in case of fire.

(4) The capacity of the water spray pump is to be sufficient to deliver the required amount of wa- ter to the hydraulically most demanding area as specified above in the areas protected.

(5) A connection to the ship's fire main through a stop valve is to be provided.

(6) Remote start of pumps supplying the water spray system and remote operation of any normally

closed valves to the system are to be located in a readily accessible position which is not like- ly to be cut off in case of fire in the areas protected.

(7) The nozzles are to be of an approved full bore type and they are to be arranged to ensure an

effective distribution of water throughout the space being protected.

(8) An equivalent system to the water spray system may be fitted provided it has been tested for its on-deck cooling capability to the satisfaction of the Society.

3. Dry chemical powder fire-extinguishing system

(1) In the bunkering station area, a permanently installed dry chemical powder extinguishing system is to cover all possible leak points. The capacity is to be at least 3.5 kg/s for a minimum of 45s discharges. The system is to be arranged for easy manual release from a safe location out- side the protected area.

(2) One portable dry powder extinguisher of at least 5 kg capacity is to be located near the bun- kering station.

204. Fire detection and alarm system

1. Detection

(1) An approved fixed fire detection system is to be provided for the tank room and the ventilation trunk for tank room below deck, and also for the FC spaces.

(2) Smoke detectors alone are not to be considered sufficient for rapid fire detection.

(3) The type of fire detection system must be decided on basis of the actual fuels and combus

tible gases that may be present in the spaces. Hydrogen must be given special attention as a hydrogen fire is difficult to detect(It creates no smoke, very little heat radiation and burns

with a flame that is almost invisible to the eye in daylight).

(4) Where the fire detection system does not include means of remotely identifying each detector individually, the detectors are to be arranged on separate loops.

2. Alarms and safety actions

Required safety actions at fire detection in the FC space and tank room are given in Table 3.1 of

Sec.4. In addition, the ventilation is to stop automatically and fire dampers are to close.