Div 2: can we increase flange thickness and still call it standard b16.5 flange

[inammanj123]

I am working on a DIV-2 vessel. Can we change standard flange thickness and still call it standrd flange, asically i can ignore Following warning of pvelite:

Warnings for Flange : FLANGE :

Note: . Check Fig. 2-4(6) of Appendix 2.
This warning should not be considered for Standard Flanges as permitted by
ASME VIII in Table U-3 or for non-Code vessels.

 

[Geoff13]

I'm used to a registering authority that is fairly picky about meeting the Code exactly. This would be how they would reply. Your experience may be different.

B16.5 (2013 is what I have handy) clause 7.4 has over and under tolerances for flange thickness. If you're intentionally building a thickness outside these then it isn't strictly a Standard B16.5 flange and becomes a custom flange.

 

[TGS4]

Just wondering, you say you're designing a Div 2 vessel, and yet your "warning " is from Div 1?

Otherwise I agree with Geoff13.

 

[SnTMan]

And reference to 2-4(6) is incorrect as well. 2-4 defines types of flanges, (a) - loose, (b) - integral, (c) - optional. No (6).

Regards,

Mike

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

 

[inammanj123]

error is just copied from PVELITE.
Ok so it means in my case(8 inch flange) I can increase thickness by 3 mm, but i was talking to an Asme inspector, and he said that we can increase thickness, because B16.5 says "tf" as "minimum thickness", but i think i should clarify this thing again with him.

 

[SnTMan]

My apologies, my mistake, I see now it is FIG 2-4(6). I suppose the warning must be referring to the note about the hub slope. Ignore it for a B16.5 flange. I don't understand why you think you need to increase the flange thickness.

Regards,

Mike



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

 

[TGS4]

Regarding the flange thickness, please refer to paragraph 7.4 in B16.5 regarding the tolerances on the flange thickness. Anything outside the tolerance cannot be stamped as a B16.5 flange.