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# Gravity Flow In Pipes

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3 replies to this topic
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### #1 KRISHNASAT

KRISHNASAT

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Posted 28 April 2010 - 01:10 AM

Dear Members,
Would request you to give the details of the velocity limits for the gravity flows in a vertical pipes. And would like to get clarification from the experts, getting -ve pressure drop in the vertical pipes (gravity flow) is acceptable or am I doing some thing wrong.

rgds,

### #2 Zauberberg

Zauberberg

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Posted 28 April 2010 - 01:51 AM

Did you tru to search the Forum and look for similar threads? I believe we have dozens of similar topics.

Please go to http://www.cheresour...flow-pipelines/ and you will see a link there, leading to the Excel sheet dedicated to gravity flow, made by our Forum Administrator, Art Montemayor.

### #3 sreenivas

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Posted 28 April 2010 - 03:51 AM

Dear Member,

In my opinion, the static pressure head (due to the liquid above) at the exit of the pipe, will be converted to the velocity head. You can use the Bernoulli's equation to calculate these heads & the resultant velocity. Negative pressure drops in vertical pipelines could mean the capillary effect. However, you should check the surface tension of the fluid, to decide if it overtakes the friction factor of the pipeline.

### #4 sarm

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Posted 03 December 2011 - 03:35 PM

hi all,
i have one problem..for diesel tank overflow line (located at top of the tank rather than side) capacity calculation. given overflow line size is 1". i need to find the capacity of the overflow line need to match with inflow rate.fluid is diesel, visosity is 3.1 cp & density - 850kg/m3 @50°C. I have done calculation in pipenet but it's result is 3.75m3/hr. just need to confirm/doubt what is the max. flow rate expect from overflow line having 1" size. pl. if any solution is there pl. let me know..