When Should the High Pressure Rules in Chapter IX of ASME ... Becht
In general the test pressure shall be calculated as per equation 24 of para ASME The same paragraph also adds a paragraph "Alternatively, for CS piping with a MSYS 42ksi, the test pressure for the assembly of components, excluding pipe supporting elements and bolting (, pipe, fittings, valves, flanges), may be based on Rr for any components in the assembly."