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Interpretation: I‑89‑14
Subject: Section I (1986 Edition, 1987 Addenda), PW‑11,
NDE Prior to PWHT
Date Issued: December 15, 1988
File: BC88‑393
Question: Does PW‑11 require that NDE be performed on welds after they have been subjected to the postweld heat treatment required by PW‑39?
Reply: No, unless the conditions described in PW‑11.2.2 exist.
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Interpretation: VIII-1-98-09
Subject: Section VIII, Division 1 (1995 Edition, 1996 Addenda); NDE
Requirements for PWHT Vessels
Date Issued: December 5, 1997
File: BC97-263
Question: For a vessel in which postweld heat treatment is a requirement, is it mandatory that all radiographic examination required by UW-11 of Section VIII, Division 1 be performed after the final postweld heat treatment?
Reply: No.
Note: This Interpretation has been superceded by the following “R” (Revised) Interpretation:
*
Interpretation: VIII-1-98-09R
Subject: Section VIII, Division 1; UW-11 and UCS-57
Date Issued: February 27, 2003
File: BC03-268*
Question: For a vessel in which postweld heat treatment is a requirement, is it mandatory that all radiographic examination required by UW-11 of Section VIII, Division 1 be performed after the postweld heat treatment?
Reply: No, except that UHA-33(b) and UHA-33(c) require radiographic examination after PWHT.
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Rgds
Raj
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pgoswami@sympatico.ca
Sent: Friday, May 21, 2010 00:29
To: materials-welding@googlegroups.com
Subject: [MW:5200] NDT after PWHT
Luis,
According to ASME Sec VIII,DIV-1,welds have to be radiographed,as a part of the design efficiency, e.g RT-1,RT-2.... and others. No code will specify at what point of fabrication NDE (such as RT) has to be done, if so that becomes too binding. Often clients spefication, which is more suited to service conditions, specify if RT shall be done before or after PWHT.
Usually from codes perspectives for steels which are not prone to serious cracking (e.g P1,P3,P4,P5A) RT shall be done on completion of fabrication, prior to PWHT. For steels which may develop cracking upon PWHT, through secondary hardening, such as P5B, P5C additional NDE (RT/UT or others) should be done following PWHT, to safeguard the components.
From ASME perspectives, for PI materials RT shall be done prior to PWHT. If there is any additional project requirement of RT after PWHT it is above the code requirements.
Thanks.
Pradip Goswami,P.Eng
Welding & Metallurgical Engineer/Specialist
Date: Thu, 20 May 2010 06:30:55 -0700
From: ing_albanes@yahoo.com.mx
Subject: [MW:5198] NDT after PWHT
To: materials-welding@googlegroups.com
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