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Vertical Tank Selection

Low Flow in Pipes- posted in Ankur's blog

Started by A mukherjee, Dec 05 2010 01:27 PM

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Gold Member

Posted 05 December 2010 - 01:27 PM

Hi everyone,
Can anyone tell me what are the differences between downcomer backup flooding & downcomer choke flooding?

Junior Member

Posted 06 December 2010 - 01:23 AM

Hello Aditya,

Downcomer Backup flooding_Aerated liquid backed up into the downcomer because of increased tray pressure drop or liquid height. When this backup exceeds the tray spacing, liquid accumulates on the tray above, causing downcomer flooding. Can be checked either by increasing Tray spacing or Pressure drop
Downcomer Choke flooding is mainly function of downcomer geometry- DC top area / bubbling area. May occur when downcomer is not properly sized for vapor disengagement.

Check attached paper or you may refer ' Distillation Operations- by Henry .Z. Kister' for more details

Edited by csp_process, 06 December 2010 - 01:36 AM.

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