ASHRAE STD 15 & 34
SAFETY STANDARD FOR REFRIGERATION SYSTEMS
|Publication Date:||2 February 2020|
ASHRAE STD 15-2019 Section 18.104.22.168 states:
22.214.171.124 Pressure vessels having inside dimensions of 6 in. (152 mm) or less shall be
a. listed either individually or as part of an assembly by an approved, nationally recognized testing laboratory;
b. marked directly on the vessel or on a nameplate attached to the vessel with a "U" or "UM" symbol signifying compliance with ASME Boiler and Pressure Vessel Code, Section VIII 6; or
c. when requested by the AHJ, the manufacturer shall provide documentation to confirm that the vessel meets the design, fabrication, and testing requirements of ASME Boiler and Pressure Vessel Code, Section VIII.