B16.47 blind with hole and UG-34 thickness

[ElCidCampeador]

thread794-380735

Referring to the thread above, I have a similar case, with a blind acc. to B16.47 type B with a centered hole.

Problem: I would reinforce the hole with a sort of reinforced LWN, but in the calculation of the reinforcement the Area Required shall be calculated acc. to UG-39 (a)(1) formula, where t is calculated as per UG-34 (c)(2)(2).
Even if reinforcement check would be ok, there is a problem: "t" (as minimum required thickness) acc. to UG-34 is higher than B16.47 std blind flange. Is it anyway acceptable as analysis? It's odd because I could skip blind thickness calculation because of pressure rating of B16.47...thanks

 

[SnTMan]

ElCidCampeador, I have treated flat covers with a central opening as loose flanges under Apx 2 occasionally. You'd have to try it to see if any advantage in your case. The other methods in UG-39 apparently would be no help.

I wanted to say to ignore excess thickness in the blind (A1=0), but I don't think you can ignore that the altered blind is inadequately thick. You may be better off starting from scratch.

Regards,

Mike


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