[MW:19866] PWHT on P91 support (Pad +Shoe)

[sumod s]

Dear experts,

PWHT is done on pipe(P91) to pad (P91) weld. Is it required to do PWHT on pad (P91) to support shoe (CS) fillet weld. Please refer the attachment for details.

Sumod

[John Henning]

Grade 91 in the as welded condition is susceptible to stress corrosion cracking – you decide.

 

John A. Henning

Welding & Materials

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[Babur Khan]

Dear Sumod,

As per attached figure no need PWHT for CS tissue because no direct contact with (P91) material.

  

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Regards

BABUR KHAN LASHARI

Welding Inspector

Mob: +966 (0) 56 2179280

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[Ritesh Rajput]

Dear All

As per my opinion, It is Acceptable with Normal Clause of Heat Treatment, it was not in contact with P 91 material ,  So Not  Need to Heat treatment of CS.

but it is Actually Depend upon thickness of weld Bead of Carbon Steel Plate with P91 Material   and  More on  Heat  which Was Produced During Carbon Steel welding Pad .

But Geometry show that , if  you do Heat Treatment only to P91 material it will surely effect on  CS Support , so it is better you do Heat treatment to Whole Assembly include CS support To Avoid Stress Concentration .

Dear friend :Please Put one thing in mind ,Heat Treatment always show benefit to any Material within if  it 's within Temperature range so Do not worry .

Dear jhen: I am Looking your response on my  explanation .

Regards

RItesh Rajput 

Sr.Manager 

United Piping Solution Group

[george....@gr.bureauveritas.com]

It is not a Code requirement to PWHT the fillet weld between P91 pad and CS support since the pad is not a pressure part.
However I would suggest that you do a PWHT to this weld, especially if you have a corrosive environment.
You could propose a monitoring plan for those welds, but it will be difficult to implement it since I suppose that this line will be insulated.
You may save a lot of trouble in the future if you do a PWHT for this fillet weld.
 

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor
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I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS HELLAS

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(See attached file: Dilintas_George.vcf)

sumod s ---15/01/2014 18:47:25---Dear experts, PWHT is done on pipe(P91) to pad (P91) weld. Is it required to do PWHT on

From: sumod s <sumod.sa...@gmail.com>
To: materials-welding <material...@googlegroups.com>
Date: 15/01/2014 18:47
Subject: [MW:19867] PWHT on P91 support (Pad +Shoe)

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[HAREESH K V]

You have to follow the WPS, which you have established for welding CS with P91.

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[Ali Al-Zawamri]

Dear,

Before saying PWHT required or not we need to know the thickness of the paf and the size of the weld?
If heat transfer to P91 is less through the CS pad then no stress creation will take plase in the P91 in this case no PWHT required but as said above this will depend on CS pad thickness.

Regards

[Farhan]

Dear Firends

Hi how is going,

Regarding the question P91 Pad to CS support welding joint PWHT required or not.

I would ask first question, are you not using this P91 highest Alloy steel family (A335) material due to high pressure and temperature, if yes. then why not going for Higher grade alloy like P22/P11 to avoid creeping defect as CS above 440 degree C start Graphidisation.

Designer should consider higher allow to avoid inconvenience in long run.

Regard

Farhan

Project Engineer 

PDO-Oman