Section 154.519 - Piping relief valves(a) The liquid relief valve that protects the cargo piping system from liquid pressure exceeding the design pressure must discharge into:(2) A cargo vent mast if that vent mast has a means for the detection and removal of the liquid cargo that is specially approved by the Commandant (CG-ENG).(b) A relief valve on a cargo pump that protects the cargo piping system must discharge into the pump suction.CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983