Hi Ray,

Per ASME Section VIII Div.1, PWHT is required for welded joints not exempted in UCS-68(b) when MDMT is colder than -55degF. For discussion sake let's consider a vessel with MDMT at -60degF, using only P-1 materials (e.g SA516-70) with impact test done at -60degF. Category C and D joints are not exempted from PWHT as per UCS-68(b), if I interpret correctly. I tried to model this vessel design and noticed that PVElite does not seem to capture this requirement at nozzle-to-shell (Cat D) weld joints. So I would like to know what is PVElite's interpretation on this code requirement.

Thank you.