This section of ASME B31, Pressure Piping Code, contains requirements for the materials, design, fabrication, assembly, erection, testing, and inspection of refrigerant and secondary coolant piping for temperatures as low as —320°F (—195.5°C), except when other sections of the code cover requirements for refrigeration piping.
ASME B31.5 does not apply to the following:
Self-contained or unit systems subject to the requirements of Underwriters’ Laboratories (UL) or other nationally recognized testing laboratories
Piping designed for external or internal gauge pressure not exceeding 15 psig (100 kPa)
Effective Edition, Addenda, and Code Cases
To determine the effective edition, addenda, and code cases for piping systems within the jurisdiction of ASME B31.5, follow the guidelines delineated for nonnuclear piping systems within the jurisdiction of ASME B31.1. #Little P_Eng