[Code of Federal Regulations]
[Title 46, Volume 2]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR64.59]

[Page 321]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 64_MARINE PORTABLE TANKS AND CARGO HANDLING SYSTEMS--Table of Contents
 
  Subpart C_Pressure Relief Devices and Vacuum Relief Devices for MPTs
 
Sec. 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.