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# Buckling of Cylindrical Shell

## Buckling of Cylindrical Shell

(OP)
Hi All,

Do you have any idea why the cylindrical vessel do not consider buckling in the calculation ?
Is it already been considered in the thickness formula in UG-28 as per ASME section VIII Div. 1 ?

### RE: Buckling of Cylindrical Shell

Hi Sam Low

If the vessel is under internal pressure it won’t buckle, if the vessel is subject to external pressure then buckling would be considered with ASME, it also depends on the diameter to length ratio of the vessel.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

### RE: Buckling of Cylindrical Shell

#### Quote (Sam Low)

Do you have any idea why the cylindrical vessel do not consider buckling in the calculation ?
Is it already been considered in the thickness formula in UG-28 as per ASME section VIII Div. 1 ?

Yes, buckling is considered in longitudinal compression and external pressure acting on cylinders. If it is available to you see Sec II, Part D, Appendix 3 for discussion.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

### RE: Buckling of Cylindrical Shell

Vessel design considers buckling if external pressure (ie, internal vacuum) is specified.
If full or partial vacuum is not specified, then usually it is not considered.
Vessels design for pressure will be adequate some some amount of vacuum, so if it is an existing vessel or existing design, adding vacuum requirements may or may not affect the design.

### RE: Buckling of Cylindrical Shell

(OP)
As what I have studied, COMPRESS follow Bergman (ASME paper 54-A-104) calculation to cross check the buckling effect on the vertical cylindrical shell.

What if my vessel is horizontal orientation with external pressure and there is a heavy load on top of it? How could I calculate the buckling for the shell? Even though it can withstand the compression force (lesser than allowable compression force), it doesn't mean no buckling effect occurs. The shell might not be in rounded shape anymore.

Thanks guys!

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