Curves - viscosity 2

[mmentzos]

Please i want to know how the curves of H(Q) (of a centrifugal pump) changes if the fluid is not the water but an oil with:

Relative density 0.759
Viscosity 0.53 cST

Also I have mention that the operation temperature is 364 oC

Thanks in advance
Mike

 

[adula29]

Viscosity 0,53cSt have no influence for performance curves
f(Q)=H.
By the way to appoint correction factors You must take BEP (Best Efficiency Point) only.
Generaly viscosity have influence on performance curves about 4 - 6 cSt. It depend for specific speed

Sorry for my ENGLISH

I understand more but I don't speak english very well

 

[GPRnD]

Your best bet for viscosity correction is to use the HI method. For that you simply need to buy their standard and use it.

However as Adula29 points out, 0.53 cST will not require any viscous correction.

 

[mjpetrag]

http://www.pdhengineer.com/Course F...ugal Pump Analysis Petroleum Applications.pdf

Page 11 corrects for specific gravity differences. On page 23 is a viscosity correction chart. But usually anything less than 10 cSt doesn't need a viscosity correction factor.

-Mike

 

[adula29]

Note that the HIS correction chart consist of two separate charts.

http://lh5.ggpht.com/webwormcpt.wwc...0/Centrifugal Pump Visc Correction 10-100.PNG

 

[GPRnD]

THe HIS chart you linked to there appears to be the old HIS viscosity standard not the new one from 2002.

The old one yields significant errors particularly on low specific speed pumps.