Code of Federal Regulations (Last Updated: May 6, 2024) |
Title 46 - Shipping |
Chapter I - Coast Guard, Department of Homeland Security |
SubChapter F - Marine Engineering |
Part 64 - Marine Portable Tanks and Cargo Handling Systems |
Subpart C - Pressure Relief Devices and Vacuum Relief Devices for MPTs |
§ 64.59 - Spring loaded pressure relief valve.
Latest version.
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§ 64.59 Spring loaded pressure relief valve.
A spring loaded pressure relief valve must -
(a) Be set at a nominal pressure of 125 percent of the maximum allowable working pressure;
(b) Have a minimum normal venting capacity that is sufficient to prevent the tank pressure from exceeding 137.5 percent of the maximum allowable working pressure;
(c) Close after discharge of a pressure not lower than 115 percent of the maximum allowable working pressure; and
(d) If closed, remain closed at any pressure less than 115 percent of the maximum allowable working pressure.