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Pump Curve Vs System Curve

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#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?

 

I am looking forward for your answer!

 

Thank you in advance!

 

Please see the attached picture

 

Kind regards,

Panos

Attached Files



#2 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 .

 

I've added a spread sheet to support .

 

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. 

Attached Files



#4 breizh

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Posted 03 December 2019 - 07:10 PM

Hi,

https://www.pumpfund... total head.pdf

 

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

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Posted 04 December 2019 - 04:20 PM

Breizh thank you so much for your important help! :)



#6 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?

Thank you in advance!



#7 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.





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