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# Pump Curve Vs System Curve

pump power torque bernulli

6 replies to this topic
|

### #1 panoskagiou

panoskagiou

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Posted 02 December 2019 - 03:45 PM

Hello everyone! Please  could you help me with the difference between the pump curve and the system curve?

And how I can derive the equation, which describes this curve?

Kind regards,

Panos

### #2 breizh

breizh

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Posted 02 December 2019 - 07:13 PM

Hi,

Let you study the material attached  (KSB pamphlet) .

The intersection between the pump curve (provided by manufacturer ) and the system curve ( Head Vs Flow rate  calculated using Bernoulli equation ) is the operating point .

Hope those documents can support your work .

Breizh

#### Attached Files

Edited by breizh, 02 December 2019 - 09:49 PM.

### #3 panoskagiou

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Posted 03 December 2019 - 01:41 PM

Hi! You are always incredible helpful. I thank you so much!

The reason of my question was to try to understand the simple sentence:

The head of the pump does not depend on the density of the fluid or generally does not depend on the fluid.

I tried to understand this from several formulas. And I was looking a formula in which the head indeed does not depend on

the density. But, I found something in my notes and in the internet please see attached.

And I was wondering if you have any extra information about the one of the two formulas (which correlated the head of the pump with the rotational velocity, etc).

Please see the attached pictures and tell me you opinion!

Thank you again for the really interesting documents.

### #4 breizh

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Posted 03 December 2019 - 07:10 PM

Hi,

Consider the link above to understand the effect of specific gravity  on head .

https://www.nuclear-...hine-equations/

For the second question it has to do with Euler equation (link above)

Good luck

Breizh

Edited by breizh, 03 December 2019 - 10:36 PM.

### #5 panoskagiou

panoskagiou

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Posted 04 December 2019 - 04:20 PM

Breizh thank you so much for your important help!

### #6 panoskagiou

panoskagiou

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Posted 04 December 2019 - 04:31 PM

I would like to ask you a last question related to rotating equipment. The same idea is applied also for the compressors?

I mean the actual head is derived from the euler equation?

### #7 breizh

breizh

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Posted 04 December 2019 - 06:23 PM

Hi,

Yes seek for turbomachine  using your favorite search engine.

Good luck,

Breizh

Edited by breizh, 05 December 2019 - 12:42 AM.