P11 alloy steel Grade Material - PWHT scope

[Zakaria ghrab]

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

[Raghuram Bathula]

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

[ramón ignacio briceño]

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: raghura...@gmail.com
Date: Wed, 16 Jan 2013 13:34:38 +0530
Subject: Re: [MW:16523] P11 alloy steel Grade Material - PWHT scope
To: material...@googlegroups.com

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[Zakaria ghrab]

Thank you Ramon,

  Did you have some ASME references !

Regards.

2013/1/18 ramón ignacio briceño <bric...@hotmail.com>

--

زكرياء غراب
GHRAB Zakaria
Jorf Lasfar Units 5&6 Power Plant construction Project
EA2C/ SDEM Entreprises
Site QA/QC Manager
Mobile : Morocco (+212) 6 61 07 00 11
             Tunisia (+216) 96 635 805


Yesterday is the pass, tomorrow is the future; and today? Today is the present, the gift: Enjoy it!

[kannayeram gnanapandithan]

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 <zakari...@gmail.com> wrote:
> Thank you Ramon,
>
> Did you have some ASME references !
>
> Regards.
>
> 2013/1/18 ramón ignacio briceño <bric...@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: raghura...@gmail.com
>> Date: Wed, 16 Jan 2013 13:34:38 +0530
>> Subject: Re: [MW:16523] P11 alloy steel Grade Material - PWHT scope
>> To: material...@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
>> <zakari...@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
>>
>>
>>
>>
>>
>>
>> --
>> To post to this group, send email to material...@googlegroups.com
>> To unsubscribe from this group, send email to
>> materials-weld...@googlegroups.com
>> For more options, visit this group's bolg at
>> http://materials-welding.blogspot.com/
>>
>> http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
>>
>> 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.
>>
>>
>>
>> --
>> To post to this group, send email to material...@googlegroups.com
>> To unsubscribe from this group, send email to
>> materials-weld...@googlegroups.com
>> For more options, visit this group's bolg at
>> http://materials-welding.blogspot.com/
>>
>> http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
>>
>> 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.
>>
>>
>>
>
>
>
> --

> *زكرياء غراب
> **GHRAB Zakaria** *

> Jorf Lasfar Units 5&6 Power Plant construction Project
> EA2C/ SDEM Entreprises
> Site QA/QC Manager
> Mobile : Morocco (+212) 6 61 07 00 11
> Tunisia (+216) 96 635 805
>
>
> Yesterday is the pass, tomorrow is the future; and today? Today is the
> present, the gift: Enjoy it!
>

[Ranendra Chakraborty]

Dear Ghrab,

PWHT is required if the thickness is greater than 13 mm. Please refer ASME B 31.3 table 331.1.1

 

Regards,

Ranendra chakraborty

[Shomenath Bagchi]

PWHT after welding is advisable for better properties.

---

From: Zakaria ghrab <zakari...@gmail.com>
To: material...@googlegroups.com
Sent: Wednesday, January 16, 2013 1:22 PM
Subject: [MW:16522] P11 alloy steel Grade Material - PWHT scope