Preheating and PWHT for B31.3 CS mtls

[Binoy Lonappan]

Whats the thickness shall be done with PWHT CS material as per B31.3 latest edition .
Here the joint is  branch weld of high thickness weldolet with low thickness pipe.

BINOY L
QC
   

[Lu, Feng]

If both thickness are under 25mm (1”), the PWHT can be exempted if you preheat to 95 C (or 200F) minimum.

 

If the weldolet exceeds 25mm, you need PWHT at 595 ~ 650C for 1hr/25mm.

 

 

Feng Lu, Ph.D. Metallurgy and Welding Engineer

Zachry Industrial, Inc. 527 Logwood San Antonio, TX 78221 l...@zachrygroup.com Office: 210.588.7818 Cell: 512 797 5777 Fax: 210.588.5037 www.ZachryGroup.com

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[Lalu Rajendran]

Hi,

As per ASME B31.3 Edition2014, there is the exception for PWHT for P1 Carbon steel materials. Please see the below extract.

regards,

LALU

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[Binoy Lonappan]

As per the attached requirement from B31.3.2014 edition PWHT tequirement .the thickness considered is the lesser of the two parts joining .
Does it means if one of the parent metal is of below 25 mm PWHT not required.?

BINOY L
QC Engineer-Mechanical
AGC.
Project:AFU KKIA Riyadh.KSA
   

On 26 Mar 2016 12:48 pm, "Binoy Lonappan" <bino...@gmail.com> wrote:

I have checked this but for PWHT the minimum thickness is not given.

BINOY L
QC Engineer-Mechanical
   

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[Binoy Lonappan]

I have checked this but for PWHT the minimum thickness is not given.

BINOY L
QC Engineer-Mechanical
   

On 24 Mar 2016 7:08 pm, "Lalu Rajendran" <lal...@gmail.com> wrote:

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAOwU13tQWAZMSoY5C1OXOqYQYDHrSwnGvHcOuBR6MJc153h4dA%40mail.gmail.com.

[Binoy Lonappan]

[Mathiyazhagan V]

As per b31. 3 latest no need of pwht for p no :1 I.e cs

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[Lalu Rajendran]

Please refer 331.1.3 Definition of Thicknesses Governing PWHT.

Thickness shall be considered for the joints after edge preparation. For dissimilar thickness, you should consider the thickness at bevel edges.

regards,

LALU

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