Tube to Tubesheet Weld Procedure Qualification
Tube to Tubesheet Weld Procedure Qualification
(OP)
Guys,
I am following up on this previous post: http://www.eng-tips.com/viewthread.cfm?qid=291961
Just to clarify, if we are welding a Section VIII division 1 heat exchanger that has a tube to tubesheet strength weld (partial or full), we do not need to qualify the procedure using a mock tubesheet with 10 tubes. If this is true, all we need to do to qualify this procedure, is to simply make a test coupon with the applicable dimensions and materials as if it was any other weld.
Please advise if my understanding is correct or advise if I am missing something. I could not find any reference to QW-193 in UG-20 and according to the post above, it does not exist.
I am following up on this previous post: http://www.eng-tips.com/viewthread.cfm?qid=291961
Just to clarify, if we are welding a Section VIII division 1 heat exchanger that has a tube to tubesheet strength weld (partial or full), we do not need to qualify the procedure using a mock tubesheet with 10 tubes. If this is true, all we need to do to qualify this procedure, is to simply make a test coupon with the applicable dimensions and materials as if it was any other weld.
Please advise if my understanding is correct or advise if I am missing something. I could not find any reference to QW-193 in UG-20 and according to the post above, it does not exist.





RE: Tube to Tubesheet Weld Procedure Qualification
RE: Tube to Tubesheet Weld Procedure Qualification
RE: Tube to Tubesheet Weld Procedure Qualification
However, most clients including myself will require QW-193 by engineering specification.
RE: Tube to Tubesheet Weld Procedure Qualification
RE: Tube to Tubesheet Weld Procedure Qualification
"QW-202.6 Tube‐to‐Tubesheet Qualification. When the applicable Code Section requires the use of QW-193 for tube‐to‐tubesheet demonstration mockup qualification tests, QW-193.1 shall apply. If specific qualification test requirements are not specified by the applicable Code Section, tube‐to‐tubesheet welds shall be qualified with one of the following methods:
(a) groove welds per the requirements of QW-202.2 and QW-202.4
(b) a demonstration mockup per the requirements of QW-193.1
(c) fillet welds per the requirements of QW-202.2(c) (for nonpressure retaining tube‐to‐tubesheet welds only)"
While ASME VIII/1 have no specific requirements for Tube‐to‐Tubesheet Qualification, ASME VIII/2 requires per paragraph 6.3.4 the demonstration mockup (QW-193 is very similar to Article F-3 of the old ASME VIII/2 and was removed from ASME VIII/2 and added in ASME IX with the Edition 2004, Addenda 2006).
That means in your case (design code ASME VIII/1) you have the free choice of QW-202.6 (a), (b) or (c) if applicable.
Hope that helps
Regards - Juergen
RE: Tube to Tubesheet Weld Procedure Qualification
RE: Tube to Tubesheet Weld Procedure Qualification
I appreciate any guidance on this matter.
RE: Tube to Tubesheet Weld Procedure Qualification
Yes, this weld would require qualification in accordance with one of the (3) options given in paragraph QW-202.6 of ASME Sec. IX. QW-193 is not mandatory for ASME Section VIII Division 1, to my knowledge.