PWHT Requirements and Material Selection

[enginakgun55]

Hello,

We work on material selection about column materials (shell, head, skirt). If we use A-516 Gr.70 material in this project, does it require heat treatment for repair on the column during maintenance?

Production Properties : Sour Service , Distilation Column

Best Regards

[TC Kwa]

Hi,

If it is for Sour service, PWHT shall be done, since material is A-516 Gr 70.

Thank you. 

Regards,

Ir. TC Kwa

+6012-3998739

Email: tc...@yahoo.co.uk

LinkedIn Profile : https://my.linkedin.com/in/tckwa 

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[José Juan Jiménez Alejandro]

The material 516 Gr 70 is a P1, you are mentioning that it is a repair, I suggest you check Table UCS-56-1 (b) (ASME Section VIII Div. 1), where the PWHT requirements for P1 materials appear, in ( b) it makes some exceptions to the PWHT based on the thickness of the material, if you exceed those thicknesses you will have to do the PWHT, but because it is a repair you also have to check the NB-23 and API 650 since from what I see in the drawing is a kit for the O&G Industry.
The Skirt I do not think it should carry PWHT since it is not a pressurized part.
Cheers!.

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Ing. José Juan Jiménez Alejandro

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[George Dilintas]

In sour service there is a HIC risk. This risk is reduced if PWHT is done even the weld thickness is lower than the limits of UCS-56-1

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[atul khatri]

Refer Table 1 for NACE SP0472  for PWHT requirement and its exemption.

Thanks

Atul Khatri

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