two times pwht

[fazel1]

is it accepted by ASME SecVIII to repair many of the nozzle welds of a pressure vessel after pwht and then apply pwht for the whole component, in furnace?

 

[metengr]

Yes, as long as your WPQR's have been qualified with a maximum PWHT cycle time.

 

[stanweld]

Per Section IX for subcritical PWHT of the subject welds, time at temperature is only an essential variable when impact testing is required. Per ASME Section VIII, Div.1 UCS-85(c)requires the material test report reflect at least 80% of the total time at PWHT temperature unless exempted per UCS-85(e, (f), (g), (h), and (i).