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Re: [MW:31615] POST HEATING OR dehydrogenation heat treatment

By Materials & Welding
I am sorry , Perhaps I misinterpreted your query with simple PWHT instead of Post heating / dehydrogenation.


Regards,
Atul Khatri
Principal Engineer- Piping
Haldor Topsoe India Pvt. Ltd


On Mon, Oct 26, 2020 at 10:17 AM atul khatri <atul.mnnit@gmail.com> wrote:
Dear Mr. Nikhil,
If your concern  is related to process piping then refer to table 331.1.1 of ASME B 31.3. It's based on control thickness.
If you want the specific answer to your query then please share..

-Constructional code
-Material
 -Thickness of pipe   
- Fluid service

Please check if your client  or Licensor is having any stringent requirements ,as it can supersede the codes requirement as well.

And Yes, Post weld heat requirement shall be mentioned in WPS / PQR. Refer ASME IX. It's an essential variable. Refer QW-407

Feel free to discuss in case you need further assistance.


Regards,
Atul Khatri
Principal Engineer- Piping
Haldor Topsoe India Pvt. Ltd


On Sat, Oct 24, 2020 at 8:27 PM NIKHIL THOMAS JOY <nikhil.thomasjoy@gmail.com> wrote:
Sir,

Now i'm doing POST HEATING ON WELD AFTER WELDING AT 350deg cel. for 30 min.  But could you tell me which code it mention.

Waiting for experts response.

BEST REGARDS,
NIKHIL THOMAS JOY
IWI LIMITED 
ADNOC-WHRP
0544975526


On Sat, Oct 24, 2020 at 6:42 PM Jamie Reyes <jamiejrmachineco@gmail.com> wrote:
PWHT is determined by the thickness of the material. Depending on how thick the material is will determine if Post weld heat treat is needed. To refer you to a certain code without knowing the code of Construction would only be guessing. There is more caveats involved, but without knowing more information, this  is as far as I can go. Refer to the correct code of construction for the fabrication involved.

On Sat, Oct 24, 2020 at 7:06 AM NIKHIL THOMAS JOY <nikhil.thomasjoy@gmail.com> wrote:
Dear friends,

Greetings of the day,

I would like to check the post heating details for pipe welded joints for alloy materials.
Please share in which code its available to refer.

My main concern , there is any need to mention post heating in wps or pqr.
if yes, in which code its mention.

Waiting for experts advice.

 

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Regards,
Jamie Reyes
J.R. Machine Company, Inc.

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