[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: 46CFR58.20-10]

[Page 264]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 58_MAIN AND AUXILIARY MACHINERY AND RELATED SYSTEMS--Table of Contents
 
                  Subpart 58.20_Refrigeration Machinery
 
Sec. 58.20-10  Pressure relieving devices.

    (a) Each pressure vessel containing refrigerants, which may be 
isolated, shall be protected by a relief valve set to relieve at a 
pressure not exceeding the maximum allowable working pressure of the 
vessel. When a pressure vessel forms an integral part of a system having 
a relief valve, such vessel need not have an individual relief valve.
    (b) Relief valves fitted on the high pressure side may discharge to 
the low pressure side before relieving to atmosphere. When relieving to 
atmosphere, a relief valve shall be fitted in the atmospheric discharge 
connection from the receivers and condensers. The relief valve from the 
receivers may relieve to the condenser which in turn may relieve either 
to the low side or to atmosphere. It shall be set to relieve at a 
pressure not greater than the maximum allowable working pressure. A 
rupture disk may be fitted in series with the relief valve, provided the 
bursting pressure of the rupture disk is not in excess of the relief 
valve set pressure. Where a rupture disk is fitted on the downstream 
side of the relief valve, the relief valve shall be of the type not 
affected by back pressure.