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Vessel sizing

Vessel sizing

Vessel sizing


I just want to ask any process engineer as to what would be an appropriate sizing for a horizontal pressure vessel, to be put in a pit, having a nominal volume of 6.7 cubic meters.

Operating pressure : 5 Kpa
Design pressure : 3500 Kpa
Corrosion allowance : 5 mm
Specific gravity of fluid : 0.984
Heads: Elliptical

RE: Vessel sizing

What is the actual process stream the vessel is part of? What is the throughput and/or required retention time? What is operating temperature? Should be a fairly straightforward pressure vessel calc if you have all that info.

RE: Vessel sizing

Around here- probably 4' to 5' diameter in that capacity range. If it just doesn't matter, specify the capacity and let fabricators pick the most economical dimensions.
The 5 kpa operating/ 3500kpa design seems a bit odd, but can be done if desired.

RE: Vessel sizing

From the engineering point of view, the vessel size, diameter vs length, may be based on several factors, such as process condition, instrument control requirement, physical space restriction, etc. you may consult with PE as well as the ICE and Civil for a optimum solution.

RE: Vessel sizing

Process engineer is responsible to determine length, diameter , internal specification, liquid levels..ect of the vessel based on the process data and fluid specification to ensure a good separation between fluid phases. this website might help you https://www.sspcalc.net/

RE: Vessel sizing

Keep the Length/Dia ratio at between 3 to 5 from a lowest cost / wall thickness perspective. Try to fit in all your other requirements ( level gaps, residence times, surge volumes, vapor separation, there may be other dimensional limits from the fabricator if you have to do PWHT etc ) within this ratio band. At the most, you could stretch the L/D ratio to 6 and still keep the weights and costs within acceptable norms.

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