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Simple Question With Draining

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#1 oswalt1012


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Posted 14 November 2019 - 04:48 AM


I am a process engineer and required to study drain time of water fully filled in a header.


The water filled in B will push water in A and finally pipe A and B will be drained. Then I need to calculate how long it will take to fully drain water in the pipe.

It is expected that water in B will be fully drained, pipe A will have some water remained.

It seems very simple, however I forgot the basic rules I learned before.

I believe I need a simple physics formula but I could not find any that would resolve this issue.

CAN anybody help.

#2 breizh


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Posted 14 November 2019 - 08:07 AM


You may find pointers in the link attached  (Bernoulli theorem and continuity ) :


most probably pocket of water will remain in the header !

I doubt that operation guys will operate the way you suggest , most probably if the pipes are resistant enough  they will pressurize the header with air or Nitrogen to empty both the header and the pipe .


My 2 cents


Edited by breizh, 16 November 2019 - 11:23 PM.

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