RE: [MW:7968] PWHT

Dear sir,

       According to the ASME B31.1 and to your below detail first I confirm it that PWHT is required.

 

The details as follows,

As per ASME B31.3 Table 331.1.1 

 P1-carbon steel :

 Thickness greater than 19 mm  and tensile strength for all, the PWHT minimum metal temperature shall be 593⁰ - 649⁰ C for 2.4 hr.

 

P5A-Alloy steel:

 

Thickness greater than 13 mm  and tensile strength for all, the PWHT minimum metal temperature shall be 704⁰ - 760⁰ C for 2.4 hr.

 

 So you can do PWHT with 704⁰ - 760⁰ C for 2.4 hr and cooling rate shall be followed by the same table notes.

 

It is my understanding. If any controversy let me know. Thank You.

 

Regards,

 

J.C.Andrews,

QA/QC Engineer,

Doha-Qatar.

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of kannayeram gnanapandithan
Sent: 31 October 2010 08:14 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:7956] PWHT

 

Is it allowed/accepted practice for PWHT of matl combination P1+P5A, if so what is the temp, Mr Goswami

Thank u

Pandithan

On Wed, Oct 27, 2010 at 4:33 PM, Brl Pp <refazosaris@gmail.com> wrote:

Good morning,

Please see below the data of piping line for erection:

- Diameter of pipe: 48”

- Produced: liquefied natural gas.

- Piping class: D41A

- Piping thickness: 38mm.

- Weldolet thickness : 15mm.

- Design code: ASME B31. 3. 2008 Edition.

- PWHT: By code.

According to your experience, for this case we use the PWHT?

If yes, please share your experience. Thanks in advance.

My best regards.


Redouane (Project engineer)
Algeria

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