Hi
I'm looking at the analysis of a process gas system where the piping spec is calling for A519 Gr 4130 [low carbon CrMo]. Now while I'm not 100% keen on the idea of using structural tubular sections as pressure piping [116C & 317barg], it is the owners specifications we have to work with so the material 'is what it is'. This specification and grade are not in B31.3 or ASME VIII Part II, as it is not pressure material. Does anybody out there have any information that might help me make a rational decision regarding what the allowable stresses should be set at [in line with B31.3 para 302.3.1 (d)&(f)]. I'm guessing being a structural material it will have a specified minimum tensile strength at a single specified temperature. I don't think it will have specified properties at my moderately elevated temperatures.
In fact does anybody have any experience in using this stuff in a pressure application. I think I have seen it on mud lines during drilling operations before.
All help / links gratefully recieved!