--On Thu, 9 Dec 2021 at 7:49 am, pgoswami@rogers.com<pgoswami@rogers.com> wrote:Yes James,
That's possible, however from my experiences, I've seen combination PQRs always puzzle the Independent Inspectors, unless things are explained in a proper way. During our learning days in BHPV , L&T often we used to be queried by the TPIs, on combinations PQRs for PWHT and various other problems. However proper explanations of the code clauses would often solve problems.
Thanks.
Pradip Goswami.P.Eng, IWE.
Cell/Whasapp:1-905-9793232
From: 'james gerald' via Materials & Welding <materials-welding@googlegroups.com>
Sent: December 8, 2021 8:52 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:32650] RE: 32639] PWHT soaking time for impact testing applicable vessel
I suppose according to ASME SecIX 2 PQR can be combined provided all essential variables are same except one say in your case PWHT time
On Wed, 8 Dec 2021 at 11:40 pm, pgoswami@rogers.com
<pgoswami@rogers.com> wrote:
By the law of rationales , you should accept this combination of PQRs. Why, as explained below:
Your calculated time for soaking is -108.6 minute. 80% of that time is:- 108.6x 0.8= 86.88 @ 87 minutes.
- Vendor submitted PQR No1, is for 60 minutes
- Vendor submitted PQR No2, is for 720 minutes. 720 minutes of soaking time is well over the requirements of 89 minutes as per the above calculations.
In fact, vendor had submitted both the PQR's to safeguard the 87-minute requirement, as PQR No1 was for 60 minutes and did not meet the cut off requirements of 87 minutes. Hence, they substantiated the Sec IX requirements with the PQR of longer soaking time, i.e., 720 minutes.
In fact, the PQR with 720 minutes meet the requirements of 108.6 minutes of PWHT time. If I would the welding engineer or approving inspection engineer, I would have asked the PQR 1-(60 minutes) to be removed from the dossier, so as to avoid the confusion.
Since vendor had submitted both PQRs and if they want to retain both in the documentations, ask for a clarification note in the above-mentioned justification to close the issue.
Also, you've to make sure that both PQR1 & PQR2 meet specifically charpy impact & hardness( if applicable) in addition to the other mechanical test.
Hope this clarifies your query.
Thanks.
Pradip Goswami.P.Eng, IWE.
Independent Consulting Welding & Metallurgical Engineering Specialist
Consultant: SNC Lavalin Inc. (Nuclear &Non-Nuclear)
Saudi Aramco Approved Designated Project Welding Engineer (DPWR)
Qatar Petroleum Approved, SME-Materials & Corrosion Engineering.
Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/
Email:pgoswami@rogers.com,pradip.goswami@gmail.com
Cell/Whasapp:1-905-9793232
From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> On Behalf Of Muhammed Ibrahim PK
Sent: December 7, 2021 2:28 AM
To: materials-welding@googlegroups.com
Subject: [MW:32639] PWHT soaking time for impact testing applicable vessel
Gentle men,
A pressure vessel required PWHT, and Impact test. The vessel thickness is 46 mm. The PWHT of this vessel required as per code is 108.6 minute.
The contractor submitted a PQR which is performed 60 minutes (1hr) and 720-minute (12hrs) PWHT and all mechanical test done in both holding time.
As ASME sec IX, clause 407.2
"
QW-407.2 A change in the postweld heat treatment (see QW-407.1) temperature and time range the procedure qualification test shall be subjected to PWHT essentially equivalent to that encountered in the fabrication of production welds, including at least 80% of the aggregate times at temperature(s). "
As per the above clause the PQR is acceptable?. It does not meant PQR shall be essentially equivalent within 80% of actual production PWHT?. Since the manufacture done 60 minutes and 720 minutes, and the production PWHT comes in between holding time (108.6) the PQR will be acceptable?
Thanks & Regards
Muhammed Ibrahim PK--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
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