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JacInsp
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Join Date: Apr 2010
Posts: 4

PWHT after Hydrotest possible or not

04/08/2010 3:50 AM

If a pipe line which its Hydrotest is completed possible for PWHT again. If so what are the steps that should perform.
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JacInsp
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Join Date: Apr 2010
Posts: 4
#4
In reply to #3

Re: PWHT after Hydrotest possible or not

05/06/2010 7:00 AM

Thanks for your kind information and the the valued one that i have received for my request.
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Anonymous Poster
#3

Re: PWHT after Hydrotest possible or not

05/05/2010 9:03 AM

Hydrotest has to be done after PWHT. There are two reasons for this

If you do not do PWHT, for a material which requires PWHT for mechanical properties, and you do hydrotest, you are increasing the chances of a brittle failures.

Secondly if PWHT is not done properly, and you induce cracks in the material, and you do not do hydrotest after that, tehn you are taking a risk of running with cracks.
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JacInsp
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Posts: 4
#2
In reply to #1

Re: PWHT after Hydrotest possible or not

04/10/2010 11:48 AM

Its pwht to be done before the hydro. Still is there any code saying that PWHT can be done after hydro, suppose a weld"o"let is not done PWHT. Shall we do it in this case.
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PWSlack
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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: PWHT after Hydrotest possible or not

04/08/2010 3:57 AM

Does the PWHT run the risk of affecting the integrity of the pipeline, or, does the applicable piping code require the hydrotest to be completed after the PWHT? If so, repeat the hydrotest after the PWHT.

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