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Rudol, Thanks for the tip. I have the third edition and never thought to look there for a rectangular flange analysis. Mahajan uses a tongue and groove design and I want to use an o-ring design, but I would assume that his analysis works for both. That should give me a pretty good approximation...

Many thanks for the feedback from JohnGP and doc9960. The A.E. Blach approach is limited to a rectangular flange that is nearly square (with an aspect ratio of less than 1.5) and treats the flange as an equivalent circular flange following ASME VIII, Div. 1, App. 2 rules. That would be a neat...

Sec. VIII, Div. 1 does not address a longitudinal flange design like the one I am looking for. I think I can prove portions of it using hoop stress and beam theory, treating the bolts as ligaments, but flange rotation and gasket factors would have to be addressed. I don't have FEA capability...

The design code would be ASME Sec. VIII, Div. 1 under para. U-2(g). Location of installation is not yet known.

I am looking for a reference to calculations that would allow me to perform the design myself. Thanks.

I am looking to design a pressure vessel in two half (180 degree) sections with longitudinal flanges that bolt together. No internal ligaments. Flat or dished heads each end. Specs. as follows: MOC: CS (probably SA-516 Gr 70) OD: 26" Length: 40 ft. DP: 50 PSIG DT: 500 F Does anyone have an...