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Tapping of Blind flanges

Tapping of Blind flanges

Tapping of Blind flanges

(OP)
I need to tap a 4" 300# RFBF with a 2.375" bore and prep the bore to allow for a full penetration weld for a 2" NPT diptube that will be installed through the flange.  I have noticed that all of the "tapped" blind flanges that I have seen, have an extra portion of reinforcement on the opposite side of the sealing surface, built into the flange. I have seen blinds that come from the manufacturer with this extra reinforcement without a tap.

1.  Does anyone know what the name of the blinds are called ?
2.  Do these type of blind flanges need to be used when performing a tapping operation as listed above ?

I'll be grateful for any feedback, Thanks

RE: Tapping of Blind flanges

This is called a hubbed blind or reducing flange.  The former are somewhat hard to find, but every SW reducing flange is made from one.

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