ASME B 31.3, PWHT Requirement for Brach Connection

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williams p wilson

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May 17, 2022, 11:16:47 PM5/17/22
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Dear Experts,

Requesting to clarify the PWHT requirement of below noted branch connection.

Weld Joint Details:
Header pipe to weldolet without reinforcement.
Material : P1
Header Pipe : 8" x 22.23 mm
Weldolet : 2" x 11.07 mm

How to calculate the Nominal Thickness (Tm) & the Requirement of PWHT

Thank You & Regards
Williams P Wilson
Welding Inspector (CSWIP 3.1)
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james gerald

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May 18, 2022, 6:35:17 AM5/18/22
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Select your Branch Connection (Weldolet) to fall in which illustration and calculate your PWHT Thickness.

Inline image
Inline image



Inline image

Thanks & Regards

J.Gerald Jayakumar




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james gerald

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May 18, 2022, 11:15:23 PM5/18/22
to 'james gerald' via Materials & Welding
As per ASME B31.3, the PWHT requirement as per below snap shot.

Inline image


Inline image


williams p wilson

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May 19, 2022, 2:54:05 AM5/19/22
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Dear Sir,

Thanks for your reply.

My case the illustration is figure 328.5.4F (d)
PWHT Thickness is Tm + tc
Tm - Nominal thickness of the branch weld not specified by the manufacturer.
Please explain, How I will calculate the same.
tc will be considered as 6 mm.

Thank You & Regards
Williams P Wilson
QA/QC Engineer
Welding Inspector (CSWIP 3.1)
P Please consider the environment before printing this message

james gerald

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May 19, 2022, 4:53:31 AM5/19/22
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Check with your Piping designer or piping engineer who have specalized software to guide with the thicknesses.

Please use attached for reference

Thanks & Regards

J.Gerald Jayakumar


Branch Olet.pdf

Ganesh Muthurajan

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May 23, 2022, 2:43:41 AM5/23/22
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Better you go for governing thickness as per ASME B 31.3.
It helps



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