PWHT Blind Flanges

[pveng6224]

I haven't seen a thread that relates to this question.

I am PWHTing a vessel that has 2 manways and 1 4" vent with a blind flange. They are SA-105N. Do these blind flanges need to be PWHT'd ? Why/why not ?

Thank you

 

[SNORGY]

Before even looking at the code, I am inclined to take the blinds off and PWHT the rest of the vessel. I see no benefit in heating an A105-N blind flange.

Regards,

SNORGY.

 

[TBP]

You're stress relieving the welds.

 

[vesselfab]

When we stress relieve for service, we throw in the Blinds.

There is usually something welded to the blinds, anyway.

Maybe not required, but the furnace is hot anyway.

 

[SnTMan]

It is not required to POST WELD Heat-Treat non-welded parts.

Regards,

Mike

 

[rneill]

As stated by others, the PWHT is for the benefit of welded joints only. However, there should be no harm in the blinds being included.