Hi Zakaria, P11 require PWHT when you not reach the limit of hardness recomended by the Codes in the Welding and ZAC. Remember, you are work with a material like low alloy carbon steel (Cr-Mo) that is self quench in air, where the welding adquire high hardnees and residual stress not recomended to put it directly in services that demand critical conditions. Such situation requires apply PWHT.
Regards,
Attention with this material.
Regards,
Ramón Briceno
Metallurgical Specialist.
From: raghurambathula@gmail.com
Date: Wed, 16 Jan 2013 13:34:38 +0530
Subject: Re: [MW:16523] P11 alloy steel Grade Material - PWHT scope
To: materials-welding@googlegroups.com
Nominal wall thickness is the thickness listed in the product specification and not the measured thickness. in your case 12.7mm is the applicable thickness
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From: raghurambathula@gmail.com
Date: Wed, 16 Jan 2013 13:34:38 +0530
Subject: Re: [MW:16523] P11 alloy steel Grade Material - PWHT scope
To: materials-welding@googlegroups.com
Nominal wall thickness is the thickness listed in the product specification and not the measured thickness. in your case 12.7mm is the applicable thickness
On Wed, Jan 16, 2013 at 1:22 PM, Zakaria ghrab <zakaria.ghrab@gmail.com> wrote:
Dear experts,
I have one doubt.
We have P11 alloy grade material pipe, size 8" SCH 80, thickness = 12.7 mm. So according ASME construction code PWHT is not mandatory.
For the same piping, we had one non conformance (pipe damage before installation). To release and close, client request to confirm thickness and dimensional check. We get for thickness measurement around 15 mm for all pipie lenght.
So, now client request to perform PWHT for welding joints related.
ISO Dwg mention 8" SCH 80.
How we can release ?
Regards.
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