Section 40(5) in The Merchant Shipping (Fire Appliances) Rules, 1969
(5)When steam is used as an extinguishing medium in cargo spaces, the boilers available for supplying steam shall have an evaporation of at least one kilogramme of steam per hour for each 0.75 cubic metre of the gross volume of the largest cargo compartment in the ship. The steam shall be available in the required quantity whenever needed during the course of the voyage and for this purpose suitable provision by way of extra feed water shall be made.
