[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: 46CFR58.20-20]

[Page 264-265]
 
                           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. 58.20-20  Refrigeration piping.

    (a) All piping materials shall be suitable for handling the primary 
refrigerant, brine, or fluid used, and shall be of such chemical and 
physical properties as to remain ductile at the lowest operating 
temperature.
    (b) Piping systems shall be designed in accordance with ANSI-B31.5. 
Piping used for cargo reliquefaction systems shall also comply with the 
applicable requirements found in low temperature piping, Sec. 56.50-105 
of this subchapter.
    (c) A relief valve shall be fitted on or near the compressor on the 
gas discharge side between the compressor and the first stop valve with 
the discharge therefrom led to the suction side. A check valve shall be 
fitted in the atmospheric discharge line if it is led through the side 
of the vessel below

[[Page 265]]

the freeboard deck, or a shutoff valve may be employed if it is locked 
in the open position.

[CGFR 68-82, 33 FR 18878, Dec. 18, 1968, as amended by CGFR 69-127, 35 
FR 9980, June 17, 1970]