Perforated Plate Thickness Calcuation in ASME Pressure Vessel Code

I'm not sure that ASME specifies this. It might not be considered as a pressure-retaining part, even though there will be differential pressure across the plate/strainers. The formula for pressure on a circular flat plate is the closest thing I can think of.

Thanks for replying tornado , if it is not in ASME , is it there in any other code or standard ? , UG-53 in ASME is describing the ligament efficiency but i think this is not the end of the maze , what about this formula you mentioned ?

regards,

FEA can be done in lieu of the code as long as you don't break the code in using it. Are you using FEA or is that just a CAD program?

If this is a filter for inside a vessel (I've designed one of those before), you can use Roark's plate design and then throw in a safety factor. You'll also need to look at differential pressure across the plate to make sure it's not too high.

In short, you can use plate stress formulas to help you.

Dear cingold,

it is a CAD program shown just for clarity ( this was one of the lessons learned here in CR4 :) , i picture worths 1000 words of discussion , :)

you`re right , this is a plate carrying filter nozzles inside a pressure vessel " strainers on plate " multimedia filter , the differential pressure obtained from the filter nozzle curve is very small as you mentioned ( 0.5 bar ).

My design had to account for the weight of filter balls (I guess that's what they're called) and catalyst sitting on top of this. It was at the bottom of a reactor. We just used the weight to get a uniform load on the plate, added a differential pressure to it, and then took a factor of safety.

If you're designing something similar, look at what's called Elephant Stools.