Viscous Fluids
| 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
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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 |
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| These calculations can be plotted on a performance
curve as follows: |
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PERFORMANCE CURVE
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