(a) Piping, valves, flanges, and fittings used in the pumping system must be designed in accordance with part 56 of this subchapter.(b) A cargo loading and discharge header or manifold must- (1) Have stop valves to prevent cargo leakage; and(2) Be visible to the operator at the cargo pump controls.(c) Each pipe and valve in the pumping system that has an open end must have a plug or cap to prevent leakage.(d) Each hose connection must be threaded or flanged except for a quick connect coupling that may be specifically accepted by the U.S. Coast Guard in accordance with the procedures in § 50.25-10 of this subchapter.(e) A non-return valve must be in the pump discharge if a backflow condition may occur during pumping.(f) Any non-metallic flexible hose that is used in the piping system must comply with § 56.60-25(c) of this subchapter.CGD 73-172, 39 FR 22950, June 25, 1974, as amended by USCG-2004-18884, 69 FR 58346 , Sept. 30, 2004