SOLAS Regulation for Fire main, Fire hydrant, Relief valve on Ship

 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.


> 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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