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Viscosity correction for liquid

Viscosity correction for liquid

Viscosity correction for liquid

(OP)
What should be the minimum viscosity of pumping liquid to use Viscosity correction chart?What is its significance?

RE: Viscosity correction for liquid

1) Wherever the chart starts, I would guess 15cSt or so
2) There will be correction factors for head, flow, and efficiency (Ch, Cq, Ce).

Low viscosity will only have a significant effect on efficiency. As you increase, it will require correction to head and flow as well.

The significance? You need a bigger motor and maybe bigger impellers
 

RE: Viscosity correction for liquid

I assume that you are inquiring about centrifugal pumps. As shown on the link, small increases in viscosity have a significant effect on pumping rate and efficiency.

http://www.pumpschool.com/intro/pd%20vs%20centrif.pdf

The pump manufacturer is the best source to answer the question for a particular application.

RE: Viscosity correction for liquid

The HI has a chart for viscosity correction on centrifugal pump performance. The effect is more significant for  small / low specific speed pump.

RE: Viscosity correction for liquid

that link is for micropumps.
See the HI info.
Small low SS pumps have a problem getting enough fluid into them t pump it.  For pipeline centrifugal pumps, 500 cP is more like it.

What would you be doing, if you knew that you could not fail?

RE: Viscosity correction for liquid

AKVS24,
You will use the chart or you will use polinomial form to calculate those correction factors.

Polinomial form are publisehd on:
http://www.warrenpumps.com/brochures/Fluid%20Viscosity%20Effects.PDF

In industrial centrifugal pump, corrections factor will be negligible for lower values than published on chart, you are able to check this with polonomial form.

HI, has a new method to calculate corrections factors.
Nomograph is not used any more.

I hope this helps.
 

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