Section 18(1) in The Merchant Shipping (Cargo Ship Construction And Survey) Rules, 1974
(1)In every ship, every boiler which provide services essential for the safety of the ship and which could be render dangerous by the the failure of its feed water supply, shall be provided with no less than two efficient and separate feed water systems so arranged that either of such systems may be opened for inspection or overhaul without affecting the efficiency of the other. In every such system means shall be provide which will prevent over-pressure in any part of the system.
