8 Hydropneumatic tanks
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.44(65) - Standards for Fixed Sprinkler Systems for High Speed Craft - (adopted on 11 May 1995) - Annex - Standards for Fixed Sprinkler Systems for High Speed Craft - 8 Hydropneumatic tanks

8 Hydropneumatic tanks

  8.1 Systems should have a hydropneumatic pressure tank with a minimum capacity of 200 I and should be fitted with a supplementary supply from a reliable potable or fresh water source that will act in the manner of a hydropneumatic tank.

  8.1.1 The tank may be omitted where the system is kept charged with fresh water by a small topping pump taking suction from the potable or fresh water supply. Topping pump operation should be automatic. The pump should be fitted with a sensor to actuate a fault alarm in the operating compartment in the event of loss of pressure to the topping pump suction. The connection of the topping pump to the potable water should be equipped with a reduced pressure back flow preventer.

  8.2 Hydropneumatic tanks should be fitted with means for audio and visual indicating in the operating compartment low water level and low air pressure conditions. When the hydropneumatic tank level drops to a predetermined level, the sprinkler pump should automatically start.

  8.3 A means should be provided to automatically prevent salt water from entering the hydropneumatic tank.

  8.4 A hydropneumatic tank in the potable water system may serve as the hydropneumatic tank for the sprinkler system provided that the potable water demand cannot deplete the water level or air pressure below the minimum levels required for fire protection.

Parent topic: Annex - Standards for Fixed Sprinkler Systems for High Speed Craft
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