Trim Calculator
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IMPELLER TRIM CALCULATOR 1) Enter the pump test curve impeller diameter in cell B17 2) Enter the reduced or increased impeller diameter in cell B21 3) Enter up to eight flow values in cells C17 - J17 If there are fewer than eight points enter the last flow multip 4) Enter the corresponding heads in cells K17 - R17 If there are fewer than eight points enter the last head multip 5) Enter the flow efficiencies (%) in cells C18 - J18 If there are fewer than eight points enter the last efficiency 6) Calculated flows, heads & BHP will appear in the blue cells 7) Click on the tabs to view the curves Q1 Q2 Q3 Q4 Q5 Q6 Q7 13.5 250 500 750 1000 1250 1500 1750 Pump Eff 50 60 73 80 84 86 86 BHP 25.9 42.3 50.6 59.3 66.9 72.7 75.5 12.5 231 463 694 926 1157 1389 1620 BHP 20.5 33.6 40.2 47.1 53.1 57.7 60.0 Trims greater than 10% can reduce hydraulic efficiency.
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This is from Pump tech company, this gives an idea of impeller trim.
Transcript of Trim Calculator
IMPELLER TRIM CALCULATOR
1) Enter the pump test curve impeller diameter in cell B172) Enter the reduced or increased impeller diameter in cell B213) Enter up to eight flow values in cells C17 - J17 If there are fewer than eight points enter the last flow multiple times4) Enter the corresponding heads in cells K17 - R17 If there are fewer than eight points enter the last head multiple times5) Enter the flow efficiencies (%) in cells C18 - J18 If there are fewer than eight points enter the last efficiency multiple times6) Calculated flows, heads & BHP will appear in the blue cells7) Click on the tabs to view the curves
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q813.5 250 500 750 1000 1250 1500 1750 2000
Pump Eff 50 60 73 80 84 86 86 83BHP 25.9 42.3 50.6 59.3 66.9 72.7 75.5 76.1
12.5 231 463 694 926 1157 1389 1620 1852BHP 20.5 33.6 40.2 47.1 53.1 57.7 60.0 60.40.9260.857
Trims greater than 10% can reduce hydraulic efficiency.
H1 H2 H3 H4 H5 H6 H7 H8205 201 195 188 178 165 147 125
176 172 167 161 153 141 126 107
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