impeller dia and system curve 1

[tomato5]

say there is a 12 inches dia impeller installed in a pump there will be a system curve and the operating point will be the intersection of these two

now, say we replace the larger impeller with a smaller impeller, will the original system curve also change or remain the same?

thank you

 

[JJPellin]

Changing the impeller diameter does not change the system curve.

Johnny Pellin

 

[chicopee]

I think that you meant is pump performance curve and not system curve, however, I don't want to second guess.

 

[tomato5]

for chicopee

no i did not mean performance curve, i meant systems curve in the second case.

thank you

 

[bimr]

The original system curve remains the same. However, the pump performance curve is lower and will intersect the system curve at a different point (lower flow).

See the attachment.

 

[LittleInch]

Tomoto5,

The answer is fairly clear, why would the system curve change when nothing in it has changed?

This is a simple question so gets a fairly simple answer. Is there something more complex behind this that would cause you to think differently?

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[tomato5]

thank you very much

aamir

 

[ProcessHVAC]

No worries, you didn't hurt any feelings.

 

[tomato5]

bimr your attachment was most useful