Section 18(3) in The Merchant Shipping (Cargo Ship Construction And Survey) Rules, 1974
(3)Every feed check valve, fitting or pipe through which feed was passes from a pump to such boilers shall be designed and constructed withstand the maximum working stresses to which it may be subjected, with a factor of safety which is adequate having regard to the material of why it is constructed and the working conditions under which it will be us. Every such valve, fitting or pipe shall, before being put into service for the first time, be subjected to a hydraulic test suitably in excess of the maximum working pressure of the boiler to which it is connected or of the maximum working pressure to which the feed line may be subjected, whichever is greater, and shall be maintained in an efficient condition.
