Cylinder end failing at pressure.

[GraemeMath]

Hello, had a quick look on the search but couldn't find anything unfortunatly.

I'm designing a tool casing (basically a cylinder with a capped end) that will have to withstand 15000PSI. I'm wondering how you go about calculatin how thick the end wall has to be to prevent it from blowing out under such pressure.

I am looking in 7th Edition Mechanical Engineering Design Book, but I can't find anything in that either.

Thanks for any help,

Graeme Mathieson

 

[cbrn]

Hi,
ASME "Boiler and Pressure Vessel Code", (especially VIII - 1 if you are hand-calculating)

Regards

 

[GraemeMath]

Thanks for the fast reply.

Where would I find these codes?

 

[GraemeMath]

Ah, I just asked one of the other engineers I work with and our company has access to them.

I've not been working in the real engineering world for long.

 

[cbrn]

Hi,
I forgot: if you are in Europe, and nobody (customer, etc...) imposes you to refer to ASME rules, you'd better refer to Pressure Equipment Directive and, in particular, to its harmonized Norm EN13445. It's far more recent than ASME BPVC and much more up-to-date as regards calculation hypotheses and criteria.

Regards

 

[GraemeMath]

Thanks cbrn.

I work for Expro North Sea Limited, and they seem to use ASME, and I just an extract from the ASME standards.

Thanks,

Graeme Mathieson

 

[GraemeMath]

I think I have found the right part. Is it th4e Discontinuity Stresses part I should be looking at?

If so, I'm not having much luck following it.

 

[cbrn]

Hi,
ehm, I don't know, I'd have to know exactly what you are designing... Anyway, as a general matter, yes, it does make sense that you look Discontinuity Stresses.

Regards

 

[GraemeMath]

It's a bored out cylinder that has to contain 15,000 PSI.

I think I have managed now. I used an equation from 27th edition Machinery Handbook instead, under the "Plates, shells and cylinders", page 294, equations a) and b)


Thanks,

Graeme