> The maximum pressure at any hydrant shall not exceed that at which the effective control of a fire hose can be demonstrated.

Fire mainmeaning

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Fire mainon ship

Firemains and hydrants

> Fire hoses of approved non-perishable material and be sufficient length to project a jet of water to any of the space required.

> 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.

Fire mainpipe

> 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.

> 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.

> For machinery spaces nozzle size shall obtain the maximum pressure from two jets from the smallest pump. Nozzle size > 19mm need not be used