Section 40(1) in The Merchant Shipping (Fire Appliances) Rules, 1969
(1)Where provision is made for the injection of gas or steam into machinery or cargo spaces for fire extinguishing purposes, the necessary pipes for conveying the gas or steam shall be provided with control valves or cocks which shall be so placed that they will be easily accessible and not readily cut off from use by an outbreak of fire. Such control valves or cocks shall be so marked as to indicate clearly the compartments to which the pipes are laid. Suitable provision shall be made to prevent inadvertant admission of the gas or steam to any compartment. Where cargo spaces fitted with smothering gas for fire protection are used as passenger spaces the smothering gas or steam pipe connection shall be blanked during service as a passenger space.
