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8" Stub In Connection from 24" Blind Flange

8" Stub In Connection from 24" Blind Flange

8" Stub In Connection from 24" Blind Flange

(OP)
Our Client requires a 8" Connection from the Flat face of 24" Blind Flange. The 8" connection is for a purging valve requirement.
Is there any calculation in ASME B 31.3 to find whether this 8" stub in from the 24" Blind Flange is possible?

RE: 8" Stub In Connection from 24" Blind Flange

There are many many posts about drilling or connecting to blind flanges - please search for them.

However the largest size you can attach to a 24" blind flange is 3 1/2" without using a hub flange (table 6 of ASME B 16.5)

The calculation will be to ASME VIII not B 31.3.

It probably won't pass without a LOT of reinforcement.

Far better to either weld a 24 x 16 reducer to a 24" WN flange and then a 16 x 8" reducer to that or use an 8" reducing hub flange or try and get a blind flange made with a hub of suitable thickness and then drill it out.

You unfortunately need to tell your client that they can't just weld on an 8" pipe to a standard 24" blind flange and be compliant with the design codes. Ignore words such as "temporary" or "commissioning". If it has pressure in it design it properly otherwise your risk to people and property increases and then it will be YOUR fault, not the clients....

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