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PD 5500 Vacuum

PD 5500 Vacuum

PD 5500 Vacuum

(OP)
Hello,

Were having a problem in getting a vessel to pass full vacuum. The vessel shell is out of 3mm and we can only fit one stiffening ring due to nozzle placement..

We cannot get the moment of inertia sufficiently with one ring. Is there another way around this?

J

RE: PD 5500 Vacuum

Clareok, you can:
1) Lower vacuum pressure
2) Lower vacuum temperature
3) Change shell material
4) Increase shell thickness
5) Decrease shell diameter
6) Decrease shell length / add lines of support

Option 4) is usually the least expensive at the design stage, option 6), can you bridge a nozzle or put rings inside?

Regards,

Mike

RE: PD 5500 Vacuum

If you have a manhole, you might consider internal stiffening rings as per UG-29.
Cheers,
gr2vessels

RE: PD 5500 Vacuum

Oops,
I forgot your design is per PD5500, I couldn't check it now, but I'm sure the principle of internal rings applies to PD500 too.

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