stress analysis on flange for circular duct

[decabooter]

I'm doing a stress analysis (hand calcs, not FEA) on some round air ducts. Someone brought up the stress at flanges (either into air boxes or expansion joints) could be a concern. I guess I can imagine how a stiff section of the flange might cause some localized stress, but I don't know how to analyze it. Any suggestions?

Thanks.

 

[arto]

Look @ ASME Boiler & Pressure Vessel Code Sect. VIII, Div. 1, Appendix 2 for flange design.

 

[esce]

If you are designing the flanges as flat faced (metal to metal contact outside the bolt circle) I have the Class 1, Category 1 programed in Mathcad. Let me know if you could use it. I would be happy to share it with you.


Erie Shore Consulting Engineers, Inc.

http://esce.freeservers.com

 

[decabooter]

Thanks for the info. Thanks for the offer on the mathcad program, but I don't have matchcad (or even a fortran compiler, if it kicks it could be kicked out as code.) Besides, it needs to be in a documented report, so I will have to go through the calc from scratch anyway. Thanks though.