Re: [MW:19892] RE: 19867] PWHT on P91 support (Pad +Shoe)

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  

On 15 January 2014 20:54, John Henning <jhenning@deltak.com> wrote:

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

 

John A. Henning

Welding & Materials

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of sumod s
Sent: Wednesday, January 15, 2014 5:54 AM
To: materials-welding
Subject: [MW:19867] PWHT on P91 support (Pad +Shoe)

 

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

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