§64.59. Spring loaded pressure relief valve.
46 C.F.R. § 64.59
A spring loaded pressure relief valve must—
Be set at a nominal pressure of 125 percent of the maximum allowable working pressure;
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;
Close after discharge of a pressure not lower than 115 percent of the maximum allowable working pressure; and
If closed, remain closed at any pressure less than 115 percent of the maximum allowable working pressure.
Notes, amendments, and revision history
Authority
Authority: 46 U.S.C. 3306, 3703; 49 U.S.C. App. 1804; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.3.
Source
Source: CGD 73-172, 39 FR 22950, June 25, 1974, unless otherwise noted.