Regulation for Fire main
> A Fire Main System must have at least two independently driven fire pumps
> Pump should be able to deliver water at a continuous pitot tube pressure of at least 3.4bar at least two fire hose nozzles that are connected to the highest two fire hydrants on the unit.
> Pressure @ hydrant:
for passenger ships:
4,000 gross tonnage and upwards 0.40 N/mm2
less than 4,000 gross tonnage 0.30 N/mm2
for cargo ships,
6,000 gross tonnage and upwards 0.27 N/mm2
less than 6,000 gross tonnage 0.25 N/mm2
> The maximum pressure at any hydrant shall not exceed that at which the effective control of a fire hose can be demonstrated.
Fire Hydrants:
> Number and position of hydrants shall be such that at least two jets of water, not emanating from the same hydrant, one of which shall be from a single length of hose, may reach any part of the ship.
> They should be positioned in such a way that the fire hose may be easily coupled to them.
> They should be fitted with a valve for controlling the discharge. Hydrant valves fitted in fire mains should be designed to open with an anti-clockwise rotation of the hand wheel.
Fire Hose
> Fire hoses of approved non-perishable material and be sufficient length to project a jet of water to any of the space required.
> Fire hose length of at least 10m, but not more than,
-15m in machinery space
- 20m in other spaces and open deck
- 25m for open decks on ships max breath>30m
> In passenger ships, at least one fire hose for each hydrant.
Nozzles
> Standard nozzle shall be 12mm, 16mm and 19mm
> For accommodation and service spaces nozzle size >12mm need not be used
> For machinery spaces nozzle size shall obtain the maximum pressure from two jets from the smallest pump. Nozzle size > 19mm need not be used
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