PWHT of blind flanges

[Muhammed Ibrahim PK]

Dear All,

Is it required to place permanent blind flanges in the furnace when the vessel requires PWHT ?. 

If there is handle welded on blind flange, PWHT required ?

Thanks & Regards
Muhammed Ibrahim PK

[sridhar cn]

Permanent blind flanges may not require PWHT, any welds associated with them typically do, if they affect 

the structural integrity. But if the handle is a temporary weldment, and removed later or if the fillet is small,

then PWHT is not needed. 

C Sridhar.

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[Mohd Siraj]

which type of gasket u will use to fix permeant blind flange?

[venkateswara reddy Desireddy]

Blind Flanges (manhole or other) are keep separate in farnace. Don't assemble with vessel. 

Flanges serrations need to protect, apply chalk powder .

Welded flanges will do PWHT along with vessel. Because of flanges thickness.

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