Dear All,
I have been a CONSULTANT FOR such problem & my personal opinion is expressed as follow.
I fully agree with views expressed so far.
But bag to differ that " Code is a law, with engineering judgments. Hence the inspector has the rights to declare that the original HT was inadequate."
Inspectors & total industry must resist the "REJECTION". We as intellectual & having seniority must become practical.
How the code will revise???.
ANS.: One is experiments (Pure research) & second is such chances that gives opportunity to experiment !!!
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My understanding is that it is P1 material.
In that case every pass normalizes the immediate bottom pass.
Hence code requirement for P1 FOR MANDATORY SR is 32 mm & above thickness.
SOLUTION:
In any case
0. After SR=PWHT no PTC testing is required as per code--Unless for low temp. vessels. That means code is assuming that if every care is taken as per code then there is not much of a change in mechanical properties of WELD & HAZ. Hence this minor time difference can not result in tremendous non agreeable metallurgical & OR mechanical OR process guarantee type defect. Depending up on final use the best decision can be arrived at.
1.if sufficient length is available ON PRODUCT then carry out all DT.
2.if sufficient length is not available on product carry out HARDNESS survey on PP, HAZ & WELD.
THIS WILL GIVE FAIR IDEA OF TT & WELD TENSILE VALUES. If + then proceed for all test on PTC.
3. Prepare additional Test piece & let it undergo simulated SR with less by 5 minutes. Test for all test required by
product designed use.Prove with guts.Nothing goes wrong.
Even if all above proves wrong accept the defeat with guts on experimenting.
Please do it even for your self satisfaction. Who knows It might become a code case.
How can we have code without negative tolerance on time: Whatsoever--???.
All this is without any prejudice to the contribution by other experts in the group. Further comments welcome for better understanding on the issue.
Best Regards,
C.B.KAPADIA
Free-Lance Fabrication Technology & API Monogram Certification consultant
C.B.KAPADIA
Free-Lance Fabrication Technology & API Monogram Certification consultant
From: pgoswami <pgoswami@quickclic.net>
To: materials-welding@googlegroups.com
Sent: Tuesday, 24 July 2012 5:42 PM
Subject: RE: [MW:14949] RE: 14919] Stress relieving Rejected for 5 min less soaking time.
Harish/Mohd,
I am not trying to act as moderator.
Looking at the problem, a separate simulation may be as time consuming as the original HT. Code is a law, with engineering judgments. Hence the inspector has the rights to declare that the original HT was inadequate. The simplest solution what looks to me is to perform additional SR for 15-20 mins and satisfy code requirements.
PWHT time is all cumulative , and there no restriction form ASME code.
Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario , Canada .
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Harish Kannepalli
Sent: Monday, July 23, 2012 11:58 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:14942] RE: 14919] Stress relieving Rejected for 5 min less soaking time.
You can propose the following to your client:
-- Perform Simulation on separate coupon, check the mechanical & metallurgical properties. If they meet the code requirements, it may be acceptable. After all, code is made by humans for humans.
--
2012/7/23 John Henning <jhenning@deltak.com>
--Most common materials require 1 hour/25mm or 60minutes/25mm and I assume you are working with one of these materials. Then, for a 40mm thick material the required minimum soak time is (40mm)*(60min.)/(25mm) = 96 minutesYou don't meet Code required minimum soak time. Your soak time must exceed the minimum time. Therefore, your pipe weld is unacceptable. No discussion – it is clearly unacceptable in its present condition.John A. HenningWelding & MaterialsFrom: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of mohd
Sent: Saturday, July 21, 2012 1:52 AM
To: materials-welding@googlegroups.com
Subject: [MW:14919] Stress relieving Rejected for 5 min less soaking time.Dear expert,As per ASME 8-1-UCS-56We have done SR for our 40mm thk-30" pipe joint.but unfortunetly, soaking time was just short by 5min.Now our client/PMC both are not agree to release.Required time : 1hr.15minActual Time : 1hr.10minIt is acceptable OR could you share any technical view to convince client?regards,mohd.--
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regards,
Harish.
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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