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Designing Rings for Pressure Carrying Applications
4

Designing Rings for Pressure Carrying Applications

Designing Rings for Pressure Carrying Applications

(OP)
Hello,

I need to design rings that can withstand a certain amount of pressure. ASME Section VIII has thickness calculations for full plates in UG-47 & UG-34, but the thicknesses yielded from these calculations are over designed (as expected). Can anyone point me in the right direction for ring thickness calculations?

Thanks!

RE: Designing Rings for Pressure Carrying Applications

Pressure applied in the plane of the ring, normal to the ring, or what?

RE: Designing Rings for Pressure Carrying Applications

And Code / non-Code application? If Code, which?

RE: Designing Rings for Pressure Carrying Applications

(OP)
Pressure would be applied normal to the flat face of the ring.  ASME Section VIII code would be preferred but is not required.

Thanks

RE: Designing Rings for Pressure Carrying Applications

And how is the ring supported? Can you provide a sketch?
Ring calculations are in ASME VIII calculations for flanges, but the way pressure is applied and supporting is arranged is specific to flanges (could be adapted though).
 

prex
http://www.xcalcs.com : Online engineering calculations
http://www.megamag.it : Magnetic brakes and launchers for fun rides
http://www.levitans.com : Air bearing pads

RE: Designing Rings for Pressure Carrying Applications

The annular ring is supported on both its outside edge and inside edge. I have designed such components in the past. The text "Formulas for Stress and Strain" by Roark and Young provides tables with such plates with different loads and different edge conditions. You'll be able to find your case in that text. Or you can refer to texts on theory of elasticity or plates and shells (such texts are the source for Roark's compendium). The solutions in Roark, etc, will give you the locations of the maximum stress for given conditions, and what that stress will be in terms of the pressure load, diameters, etc. As I remember, Roark assumes a value for Poisson's ratio of 0.2 for these circular plates, which doesn't really match most steels, so you may need to determine what effect this has on your calculations.

RE: Designing Rings for Pressure Carrying Applications

3
This is a single, circular centrally located opening in a circular flat head per UG-39(c)(1) and shall be designed according to Appendix 14.

prex
http://www.xcalcs.com : Online engineering calculations
http://www.megamag.it : Magnetic brakes and launchers for fun rides
http://www.levitans.com : Air bearing pads

RE: Designing Rings for Pressure Carrying Applications

prex is absolutely correct in his assessment.  If your design is in accordance with ASME Section VIII, Division 1, there are specific rules for this application.  prex pointed you in the correct direction.  Thanks prex!

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