Thanks & Regards
J.Gerald Jayakumar
Thanks & Regards
J.Gerald Jayakumar
--As you increase the soaking time at particular temperature then Grain size will increase. AS per Hall-petch equation and theory, Finer grains produce Good charpy Impact properties and strength.In Aramco specification the reverse of ASME Sec.IX is mentioned for soaking time as it will affect the Hardness.Thanks & Regards
J.Gerald Jayakumar
On Thursday, 9 December, 2021, 01:56:54 pm GMT+4, Muhammed Ibrahim PK <ibratech@gmail.com> wrote:--Dear Mr. Pradeep goswami,As per the statement at least 80% meant minimum or it should be at least 80% closer to actual production PWHT? The statement in sec IX is "essentially equivalent to that encountered in the fabrication of production".Suppose I have done a PQR of 6 Hours and the impact test passed. If I am using same PQR and doing PWHT of 1 hour in job, what is the guarantee that the impact will pass in PTC?. We need to simulate the production condition of at least 80% closer to PQR and impact test?.Thanks & Regards
Muhammed Ibrahim PKOn Thu, 9 Dec 2021 at 06:20, 'james gerald' via Materials & Welding <materials-welding@googlegroups.com> wrote: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/
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