Re: [MW:16551] P11 alloy steel Grade Material - PWHT scope

to avoid PWHT, u should have done preheat(120deg celsius) while welding.

Pandithan, AWS-CWI,CSWIP3.1
Welding Consultant

On 1/18/13, Zakaria ghrab <zakaria.ghrab@gmail.com> wrote:
> Thank you Ramon,
>
> Did you have some ASME references !
>
> Regards.
>
> 2013/1/18 ramón ignacio briceño <bricenori@hotmail.com>
>
>> 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.
>> 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
>>
>> 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.
>> --
>> *زكرياء غراب
>> **GHRAB Zakaria** *
>> +212606588856
>>
>>
>>
>>
>>
>>
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>
>
>
> --
> *زكرياء غراب
> **GHRAB Zakaria** *
> Jorf Lasfar Units 5&6 Power Plant construction Project
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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.