Branch PWHT - Control Thickness

[Hareesh K V]

Dear Sir,

Situation: 

Welding of pipe branch connection with RF pad.

Header size: 20mm; Thickness of RF Pad: 20mm

Branch pipe thickness: 10.97mm

Whether PWHT is required for the branch connection?

As per ASME B 31.3, Clause 331.1.3 (a), the PWHT control thickness is the lesser of the below two conditions,

(1) the thickness of the weld [ As per clause 331.1.3 (b) (5) the control thickness of branch can be calculated.]

(2) the thickness of the materials being joined at the weld or the thickness of the pressure-containing material if the weld is attaching a nonpressure containing material to a pressure-containing material.

Here can i consider (2) as 20mm as that is the thickness of the material being used in this situation and consider the same as the control thickness for PWHT?

Regards,

Hareesh K V

+91-8547859202

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Hareesh K V
+91-9447625012

[rajesh kaswala]

consider 1  because specify branch connection ,

 no. 2 just for pressure & non pressure part joint eg. support 

regard

rajesh

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[Hareesh K V]

In (2)also the branch joint with mother pipe is a pressure joint and the pad is a non pressure part. 

So can the joint between mother and branch pipe be considered for PWHT thickness? 

Is there any interpretations available. 

Regards, 

Hareesh K V

8547859202

[rajesh kaswala]

dear sir.

pls refer B 31.3 , 328.5.4D fig. 4 , 5,  6 for details

regard

rajesh

[Hareesh K V]

Dear sir, 

The figures as you mentioned are the details of branch connections. 

My question is why the clause (2) cannot  be considered for branch connections? 

If it can be considered PWHT can be waived off in my case. 

Regards, 

Hareesh K V

8547859202