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this is more clear in B 31.3, clause 331.2.3.a
On Sun, Oct 31, 2010 at 8:51 PM, cyril andrews <jcyrilandrew@gmail.com> wrote:
--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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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.
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