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# Pump Sizing

pump sizing calculation

5 replies to this topic
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### #1 Lorean

Lorean

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Posted 20 July 2020 - 09:53 AM

So i have to size pump, there is a tank A which sends liquid to centrifugal pump A, pump A delivered this liquid to tank B.
There is also tank C that sends liquid to pump C that delivers liquid to tank D.
Now according to new design, discharge of pump A will be connected to suction of pump C. How to find discharge pressure of pump A(which is the suction pressure of pump C)?
The way i calculated was : i calculated suction of pump A, then used pump curve, found rated head, converted to bar, and aded up to suction pressure got the discharge pressure of pump A. Then i used the discharge pressure of pump A, substracted friction loses of the pipe between pump A and C, took static elevation into account, and thus found suction pressure of pump C. Is it a right way to size pump? Could you please help? Both of them are centrifugal pumps

### #2 fallah

fallah

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Posted 20 July 2020 - 10:41 PM

Please upload a simple sketch of the system you described...

### #3 breizh

breizh

Gold Member

• 5,421 posts

Posted 20 July 2020 - 11:54 PM

lorean,

Please don't duplicate the same post !

We are happy to help but we want you to tell us your difficulties showing your work or at least submitting minimum information , sketch for us to support .

BTW did you talk to your supervisor ?

note : I've attached a great resource  about centrifugal pump to support your work.

Engineering is about hard work .

Good luck

Breizh

Edited by breizh, 21 July 2020 - 12:45 AM.

### #4 Lorean

Lorean

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Posted 21 July 2020 - 04:44 AM

Dear Breizh and Fallah, thanks you for your time

I have spent more than an hour and still could not figure out how to attach image sketch here...

https://imgur.com/nFjHheK

I hope you ll be able to open this sketch url,

Sorry, i m new here, i did not know that i am supposed to post only 1 post in only one forum

Thanks

Edited by Lorean, 21 July 2020 - 04:47 AM.

### #5 breizh

breizh

Gold Member

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Posted 21 July 2020 - 05:42 AM

Hi,

Next time click on the button "more reply options"  bottom right corner then attach your documents .

BTW we got your sketch .

You have two pumps in serie , you need to generate the pump curve for 2 pumps  .

Make sure the pumps are compatible and won't affect their performance working in serie.

https://www.ksb.com/...eration/191658/

Good luck

Breizh

Edited by breizh, 21 July 2020 - 05:44 AM.

### #6 Lorean

Lorean

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• 16 posts

Posted 21 July 2020 - 08:14 AM

Dear Breizh, thank you very much, you are very kind and supportive engineer
The pumps are existing pumps, so is the way i calculated right? Because the curve for both of them already exists.