[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: 46CFR58.20-25]

[Page 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. 58.20-25  Tests.

    (a) All pressure vessels, compressors, piping, and direct expansion 
cooling coils shall be leak tested after installation to their design 
pressures, hydrostatically or pneumatically.
    (b) No pneumatic tests in refrigeration systems aboard ships shall 
be made at pressures exceeding the design pressure of the part of the 
system being tested. Pneumatic tests may be made with the refrigerant in 
the system or if the refrigerant has been removed, oil-pumped dry 
nitrogen or bone dry carbon dioxide with a detectable amount of the 
refrigerant added, should be used as a testing medium. (Carbon dioxide 
should not be used to leak test an ammonia system.) In no case should 
air, oxygen, any flammable gas or any flammable mixture of gases be used 
for testing.