B31.3 appears to require the use of ASME UV-rated relief valves for thermal relief of trapped line segments.
I have an application using 1/4" to 1/2" tubing on a supercritical CO2 application, and would prefer to use non-UV rated reliefs, which are cheaper and readily available...
maxh,
Virtually all the commercial bulk liquid CO2 storage tanks in the world are carbon steel, and that includes beverage grade CO2. The only applications for stainless I have seen are for high purity systems in the semiconductor and pharmaceutical industries. A proper code-designed carbon...