ASME-B.31.3 2014 edition, Table 331.1 Postweld Heat Treatment

[andrewski]

Hello,

In ASME B31.3 edidtion Table 331.1.1 Postweld Heat Treament for P.No.1, Group Nos. 1-3: Holding Temperature Range, 595 to 650 Deg. C; Minimum Holding Time at Temperature for Control Thickness up to 50mm is 1h/25mm.... My interpretation to this is that All P.No. 1, Group Nos. 1-3 are subject to PWHT regardless of the pipe wall thickness, Can you please clarify?

Thank you and regards,
Andrewski

 

[GenB]

Unless there are exceptions. I don't have the Code but you should read it to confirm.

General Blr. CA,USA

 

[SJones]

See Table 331.1.3

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[metengr]

As is customary with codes and standards what edition of the code are you required to follow? ASME B31 Piping Codes have undergone a dramatic shift in PWHT exemptions in the last year. For the 2014 edition of ASME B31.3, there is no PWHT required for P-No 1 Groups 1-3 steel provided preheat is applied above a certain thickness and you have multiple pass welds. See Table 331.1.3.

 

[SJones]

The title of the thread says 2014 edition.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[metengr]

That it does.