Discordance between B31.1 and Sec.8 regarding Thickness for PWHT

[Newbie2211]

Hi guys!
I found discordance between B31.1 Table 132.1.1-1 and ASME BPVC Sec.8 UCS-56, So I ask you which one should apply.

In Table 132.1.1-1 of B31.1 2018 Ed., control thickness is criterion for PWHT.

But in UCS-56 of ASME BPVC Sec.8 2021 Ed., nominal thickness is criterion for PWHT.
And for P-15E, "Weld Thickness(Nominal)" is criterion for PWHT.

I'm so confused because those two thickness are different.
Could you tell me which one is correct?

 

[DekDee]

One is a Pressure Piping Code and one is a Pressure Vessel code.
If you are dealing with something you feel may be a Pressure vessel and a Pressure pipe then feel free to ask for clarification.
Otherwise, please use a bit of logic.

 

[r6155]

@ Newbie2211
ASME B31.1 2018 is old. See 2022 ed and read again

Regards

 

[Newbie2211]

@DekDee

Thank you for your kind reply.
We typically use B31.1 rather than BPVC Sec.8, so I think I need to apply B31.1.

Thanks.

 

[Newbie2211]

@r6155

In B31.1 2022 Ed., control thickness is criterion for PWHT too.

 

[r6155]

@ Newbie2211
Thickness is always the way to go for PWHT for most materials. B31.1 and VIII are the same concept, no discordance.
There are other reasons for needing a PWHT.
I told you B31.1 2022 because it is the current edition.

Regards

 

[Cobra17]

I want to know why Table UCS-66 and 323.2.2A have different values.

 

[Geoff13]

Each Code has different : [ul]
[li]Types of products covered[/li]
[li]Factors of safety[/li]
[li]Authors[/li]
[li]History[/li]
[li]Consequences of failure[/li]
[li]Etc[/li]
[li]Etc[/li]
[/ul]

Thus I would expect B31.1 and Sect VIII Div 1 to have different requirements.

Use the Code applicable to the product you are designing, and ignore other Codes.

 

[SnTMan]

In addition, different committees formulate the rules for the different Codes.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand