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Vacuum distilation Column under external pressure made in flanged sections

Vacuum distilation Column under external pressure made in flanged sections

Vacuum distilation Column under external pressure made in flanged sections

(OP)
I have a SS304 distillation column that's supposed to operate under a full vacuum and is fabricated in flanged sections 1600 mm dia each 3500 mm in length and 6 mm wall thickness.

The sections are flanged to each other by bolted flanges 1800 mm dia and 40 mm thick.

My question is, can I take credit for the flanges themselves as stiffening rings (assuming their moment of inertia is high enough which I think it is in this case) in which case the max unsupported length for a buckling calculation would become the section length of 3500 mm.

Of course, this calculation will be verified by a PE later but I am only trying to get a rough estimate of suitability for now.

RE: Vacuum distilation Column under external pressure made in flanged sections

plantprowler, you don't state a Code of construction, but under Sec VIII, Div 1 bolted flanges are considered as lines of support, so that your section length is 3500 mm as you state. See Fig UG-28.

At a quick read, there do not appear to be any particular MOI requirements for these flanges.

Regards,

Mike

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

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