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Viscous Fluids
Effect on
Centrifugal Pumps

Viscosity Correction

Viscous Fluids
Effect on
Centrifugal Pumps

The performance of centrifugal pumps is affected when pumping viscous liquids. A dramatic increase in Brake Horsepower and a reduction of Flow and Head occurs.

To determine the affects of pumping viscous fluids using a centrifugal pump use the Performance Correction Chart below:


CH = Head Correction


CQ = Flow Correction


CE = Efficiency Correction

 

EXAMPLE


To determine the affects of pumping a 1,000 SSU viscous hydrocarbon liquid with a specific gravity of 0.9 using a pump with known water performance characteristics we find that:

CALCULATIONS

WATER CAPACITY(GPM)
WATER HEAD (FT)
WATER EFFICIENCY HORSEPOWER(BHPR)
450
114
72.5%
16.1
600
108
80%
18.4
750
100
82%
20.8
900
86
79.5%
22.1
SPECIFIC GRAVITY .90 .90 .90 .90
VISCOSITY 1,000SSU 1,000SSU 1,000SSU 1,000SSU
CQ (FLOW CORRECTION)
CH (HEAD CORRECTION)
CE( EFFICIENCY CORRECTION)
0.95
0.96
0.635
0.95
0.94
0.635
0.95
0.92
0.635
0.95
0.89
0.635
VISCOUS CAPACITY(GPM)
VISCOUS HEAD(FT)
VISCOUS EFFICIENCY
VISCOUS HORSEPOWER
427
109.5
46%
23.1
570
101.5
50.8%
25.9
712
92
52.1%
28.6
855
76.5
50.5%
29.4
Viscosity Correction Curve

PERFORMANCE CURVE

These calculations can be plotted on a performance curve as shown:

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