figuring Pred in a cylidrical vessle-eplosion proofing a cyclone 1

[Dirn]

I have a vessle that I have to give the "P reduced" for but do not have any data on it since it's a new design. Is there a way to figure this out without using the arbirary numbers described in the FM data sheet 7-76? We are certain the cyclone can handle more than 4.4 psig but have not idea how to get this data. Any help or a point in the right direction would be great! Thanks in advace!

Dan

 

[psafety]

Sure there is - I assume you have a construction drawing, know the grade of steel, the weld type/efficiency used.

I use ASME vessel equations and various others originating from API and other sources. I determine the weakest element using the design stress to base design pressure.

Pred equations are in NFPA 68 2007, Ch 6.3. You decide if you will allow/disallow deformation in the event of a deflagration this determines if you factor against the ratio of yield or ultimate to the design pressure.

 

[Dirn]

Thank you for pointing me in the correct direction!