Pre-heat/PWHT question
Pre-heat/PWHT question
(OP)
Material type: SA-516-70
Material thickness: 1.75"
Code of Construction: ASME SEC VIII DIV 1 2004 ED/ADD
We are performing a repair of a tube sheet. The repair is due to a .020" deep steam cut on the gasket surface roughly .5" long. UCS-56 only addresses "welded joints". I have no welded joint, only an addition of metal to the tube-sheet.
1) Am I looking in the wrong location in the code book?
2) Would the thickness be governed by the weld depth, or the actual thickness of the base metal?
2) If the thickness is the actual base metal (tubesheet), is preheat in lieu of PWHT an option without going the route of one of the NBIC alt. methods?
Thanks in advance.
Material thickness: 1.75"
Code of Construction: ASME SEC VIII DIV 1 2004 ED/ADD
We are performing a repair of a tube sheet. The repair is due to a .020" deep steam cut on the gasket surface roughly .5" long. UCS-56 only addresses "welded joints". I have no welded joint, only an addition of metal to the tube-sheet.
1) Am I looking in the wrong location in the code book?
2) Would the thickness be governed by the weld depth, or the actual thickness of the base metal?
2) If the thickness is the actual base metal (tubesheet), is preheat in lieu of PWHT an option without going the route of one of the NBIC alt. methods?
Thanks in advance.





RE: Pre-heat/PWHT question
RE: Pre-heat/PWHT question
SA-337-5 CL. 2 Tube sheet
4.375" thick
Code of Construction: ASME SEC VIII D1 1986/1885 ADD
Small repair to gasket sealing surface. .125" in depth. Where would the requirement to PWHT be listed in regards to weld repair? This is neither shell, nor channel, nor head. It is the tube sheet, and is not listed as PWHT. It is not a welded joint. Jurisdiction is pointing back at me to answer my own question. AI shrugs his shoulders and say preheat in lieu of. NBIC says no to preheat in lieu of PWHT for P5B materials. I can't believe this small issue would be so difficult to resolve in this day of severe oversight. Would this fall into the realm of AI approval makes everything Kosher? I am split on the issue and could sure use some guidance. I am off to search through the interpretations again. Thanks in advance.
RE: Pre-heat/PWHT question