HG - Appendix Y Calc

[david339933]

I am trying to establish HG for Appendix Y flange. (Not self sealing gasket)
There is no calc in App. Y for HG.
Do I revert to App. 2 where HG = W - H?, where W = ((Am +Ab)x SA)/2 for gasket seating?
And where Am = Am2 (bolt area required for gasket seating)?

Any thoughts?

 

[SnTMan]

david339933, yes, I think you are on the right track there. See Y-1(b). I'd assume you'd need to check both operating and gasket seating (HG = W-H) cases.

Regards,

Mike

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

 

[david339933]

Thanks Mike....that seems to be the problem. Operating conditions W=Wm1 in App. Y, where Wm1 = H + HC + HG....when HG is unknown. Are you saying Wm1 be calculated as per App. 2 instead?..then use HG in App. Y where Wm1 = H + HC + HG?

 

[SnTMan]

Yes, so it would seem. It appears that as Appendix Y is based around a self energizing gasket, if that type is not used then you will have to design for both seating and operating conditions, as per Apx 2.

But, understand that I have not (and likely will not) go thru it in detail.

Regards,

Mike

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

 

[david339933]

Ha...yes, understood...I don't expect you to do it all for me! Turns out bolt stress was too great for App. Y anyhow, so I used App. 2 for all.
Just curious as to methodology for my own knowledge.

 

[SnTMan]

david339933, no, I didn't expect you did

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