CO2 system:

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Requirements of CO2 Flooding System

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1. Discharge requirement is,

 at least 50% of CO2 discharge to be carried out in 1 minute and at least 85% discharge in 2 minutes.

2. Capacity of CO2 in the system to be,

• 30% of the gross volume of the largest protected cargo space,
• 40% of the gross volume of machinery space excluding engine casings,
• 35% of the gross volume of machinery space including engine casings for vessels GT < 20000.

Total amount of CO2 cylinders depends on the highest gross volume according to machinery space and cargo space volume.

• 2 separate control must be provided, one to open distribution valve and other to release the gas
• Safety procedures must be there against unauthorized use of the system.
• Machinery space to be fitted with audio-visual alarm and ventilation blower trip.
• Alarm must trigger well before operation of CO2 flooding system.
• Permanent piping arrangements should be made.
• Manifold, distribution piping to be pressure tested. to 122 bar
• Diameter of associated pipe lines in the system should not be less than 20 mm.
• Copper and flexible pipes are allowed between CO2 cylinder and common manifold.
• Distribution pipes to cargo spaces should not pass through engine room.
• All stop valves to be checked every month to ensure their working and position.
• The CO2 flooding system installation to be checked monthly for any leakages.
• All control valves to be tested annually.

CO2 room requirements

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In CO2 flooding system, carbon dioxide bottles are placed in a separate room called CO2 room. The requirements for location, accessibility, use and ventilation of CO2 storage spaces as per IMO are:

• Spaces for storage of cylinders or tanks for extinguishing gas should not be used for other purposes.
• These spaces should not be located in front of the forward collision bulkhead.
• Access to these spaces should be possible from the open deck.
• Spaces situated below the deck should be directly accessible by a stairway or ladder from the open deck.
• The space should be located no more than one deck below the open deck.
• Spaces where entrance from the open deck is not provided or which are located below deck are to be fitted with mechanical ventilation.
• The exhaust duct (suction) should be lead to the bottom of the space.
• Such spaces should be ventilated with at least 6 air changes per hour.

CO2 bottle requirements

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• stamped pressure at 52 bar
• bursting disc rapture at 177 – 193 bar at 63°C
• hydraulically tested to 228 bar
• level tested by weighing or radioactive level detection,
• recharge if 5% lost,
• have both manual and auto operation
• clamped against movement
• if more than 10 years, require internal and external exam
• Store in temperature less than 55°C.

Class of fire, A, B, C, D

Class A – combustible material; not use CO2

Class B – oil fires; not use water

Class C – electrical fire; only can use dry powder and CO2

Class D – metal fire; only can use dry powder