## Liquid velocity (flow) in pipe during gravitational tank to tank transfer

## Liquid velocity (flow) in pipe during gravitational tank to tank transfer

(OP)

Hello,

I was wondering if someone has a calculation tool (for instance excelsheet) for a quick and dirty calculation of the liquid velocity (or flow) between two tanks if the liquid is transferred from one (high level) to the other (low level) by gravitation.

Thankx in advance,

Pepijn

I was wondering if someone has a calculation tool (for instance excelsheet) for a quick and dirty calculation of the liquid velocity (or flow) between two tanks if the liquid is transferred from one (high level) to the other (low level) by gravitation.

Thankx in advance,

Pepijn

## RE: Liquid velocity (flow) in pipe during gravitational tank to tank transfer

Try e.g. http://www.itacanet.org/natural-flow-calculator-sp... - it seems like the kind of spreadsheet you are looking for, but I haven't verified how accurate it is. The best thing is to develop your own spreadsheet and be 100% confident with the results.

Dejan IVANOVIC

Process Engineer, MSChE

## RE: Liquid velocity (flow) in pipe during gravitational tank to tank transfer

There are many Web based or apps which will give you the answer for a given set of inputs.

Remember - More details = better answers

Also: If you get a response it's polite to respond to it.

## RE: Liquid velocity (flow) in pipe during gravitational tank to tank transfer

## RE: Liquid velocity (flow) in pipe during gravitational tank to tank transfer

## RE: Liquid velocity (flow) in pipe during gravitational tank to tank transfer

The levels in your tanks will be changing continuously so the pressure drop will also be changing continuously and this necessitates the outer level of iteration.

The quickest way to solve this problem is to use one of the explicit friction factor equations to calculate the flowrate for each pressure drop value, and then to copy this equation "many" times into a spreadsheet where the pressure drop can be changed as you go down step-wise. The value of "many" will depend on how accurate you want to be, but it is very easy to copy the equations 100 or even 1000 times and go down in very small steps and get a relatively accurate answer.

Katmar Software - AioFlo Pipe Hydraulics

http://katmarsoftware.com

"An undefined problem has an infinite number of solutions"