Rolled Angle Ring as flange

[jkate]

Has anyone ever done any calculations to use a a rolled angle as a flange for bolting a head to a shell? This is not an ASME vessel and I’m just looking for a calculation method to be able to calculate the quantity and size of bolt holes and checking the thickness to use a rolled angle as a flange to hold 1 or 2 psi. Any help would be appreciated.

 

[iangineer]

Is there a gasket between the "flange" and the cover? If so, you would need to know how much stress is needed to seat the gasket. The gasket would create a moment arm to the bolts and the thickness would go up. Bolting flat metal to flat metal, though, you don't really need calculations if it's not an ASME vessel and only holding 2psig. It will leak unless it's a soft cover, but if there is any space between the cover and the flange where the bolts penetrate, then there will be a moment.

 

Not a Code vessel, but you still need to ask yourself 'what are the consequences of leaking?'

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[SnTMan]

...if there is any space between the cover and the flange where the bolts penetrate, then there will be a moment.

Unless a full faced gasket is used.

Regards,

Mike

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

 

[r6155]

As a guide, look at the details of the roof manhole in API 650.

Regards

 

[iangineer]

r6155 has a good idea. API 650 roof manhole is pretty thin and uses a full-face gasket. It's not properly seated per any bolt stress calculations, but it should be fine since it doesn't see much pressure. I couldn't find the Garlock explanation, but here is a similar PDF for bolt torques:
[URL unfurl="true"]https://www.scribd.com/document/386343118/API-650-Manhole-Torque-Values-pdf[/url]

 

[r6155]

See more in ASME VIII Div 1 Appendix 1
1.6
(4) flange thickness for full‐face gasket for heads with round bolting holes.

Use it properly.
Regards

 

[jkate]

Great. Appreciate the input.