PWHT Soaking time for Overlayed T/S
PWHT Soaking time for Overlayed T/S
(OP)
Hello all
I have a low alloy steel Tube sheet. This needs to be Overlayed with E 309MoL followed by E 316L. There is no other welding involved as the exchanger is AES type and the tube to tube sheet joint is expanded type.
The client specification calls for PWHT after all the welding is complete.
The thickness of the tube sheet is 100mm.
What should be the soaking time?
The design is ASME Sec VIII Div 1.
I have a low alloy steel Tube sheet. This needs to be Overlayed with E 309MoL followed by E 316L. There is no other welding involved as the exchanger is AES type and the tube to tube sheet joint is expanded type.
The client specification calls for PWHT after all the welding is complete.
The thickness of the tube sheet is 100mm.
What should be the soaking time?
The design is ASME Sec VIII Div 1.





RE: PWHT Soaking time for Overlayed T/S
RE: PWHT Soaking time for Overlayed T/S
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: PWHT Soaking time for Overlayed T/S
Metenger
Yes i agree with your recommendation it is common sense.
Is there a specific clause in ASME or any other code/Standard/Specification which specifies that the thickness to be considered is the thickness of the weld deposit overlay (UW 40 does not deal with such issues).
Regards
B.Moorthy
RE: PWHT Soaking time for Overlayed T/S
RE: PWHT Soaking time for Overlayed T/S
See Interpretation VIII-1-83-192 (Int Vol. 14 page 108).
..., and the minimum holding time is based on the weld overlay thickness.
jt
RE: PWHT Soaking time for Overlayed T/S
IS THERE ANY CLASSIFICATION AVAILABLE (EXCEPT EXPERIENCE) FOR THE JOINT TYPE OF TUBE-TUBESHEET (LIKE SEAL,STRENGTH,EXPANDED ETC) WITH REFERNCE TO DESIGN CONDITIONS/SERIVE/EXCHANGER TYPE ETC?
THANKING U PPL IN ADVANCE
RE: PWHT Soaking time for Overlayed T/S
RE: PWHT Soaking time for Overlayed T/S
Refer to ASME Sec VIII Div 1 Appendix A and AA for joint classification. Also you may want to check TEMA (Recommended Practices).