Pumping Formula
| Pumping Formula for any liquid | |||
| Formula for water at 20 degrees C | |||
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Pumping Formula for any liquid |
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| Volumetric flow from mass flow & density | |||
| For any liquid | |||
| Vol flow (l/s) | = | 1000 * Mass Flow (kg/s) | |
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| Density (kg/m3) | |||
| Head of liquid from pressure & density | |||
| For any liquid | |||
| Head (m) | = |
102.0 * Pressure (kPa) |
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Density (kg/m3) |
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| Pump input power from pump performance | |||
| For any liquid | |||
| Power (kW) | = |
Density (kg/m3) * Volumetric Flow (l/s) * Head (m) |
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1000 * 102.0 * Efficiency (decimal) |
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| Pump input power from kilowatt - hour meter | |||
| Power (kW) | = |
36 * Disc.Revs. * Meter Ratio Constant * Motor Efficiency (dec) |
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Time (s) * Meter Disc. Constant (rev/kW-h) |
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| Pump input power from current and voltage | |||
| Power (kW) | = |
Current (A) * Voltage (V) * Motor Efficiency (dec) * Pump Efficiency (dec) |
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57 735 |
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| Motor input energy per volume of liquid pumped | |||
| For any liquid | |||
| Energy/ Volume (kW-h/kl) | = |
Density (kg/m cubed) * Head (m) |
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367 347 * Motor Efficiency (dec) * Pump Efficiency (dec) |
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| Pump input power from engine | |||
| Power (kW) | = | Pi * Torque (N.m) * Speed (rpm) | |
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| 30 000 | |||
| = | Torque (N.m) * speed (rpm) | ||
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| 9 549 | |||
Pumping Formula for water at 20 degrees C
| Volumetric flow from mass flow | |||
| Vol Flow (l/s) | = | 1.002 * Mass Flow (kg/s) | |
| Head of liquid from pressure | |||
| Head (m) | = | 0.1022 * Pressue (kPa) | |
| Head (ft) | = | 0.3354 * Pressure (kPa) | |
| Pump input power from pump performance | |||
| Power (kW) | = | volumetric flow (l/s) * Head (m) | |
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| 102.2 * Efficiency (decimal) | |||
| Motor input energy per volume of liquid pumped | |||
| energy/volume (kW-h/kl) | = |
Head (m) |
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368.0 * Motor efficiency (dec) * pump efficiency (dec) |
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| Average velocity of flow | |||
| Through a circular section | |||
| Velocity of flow (m/s) | = |
1273 * Volumetric Flow (l/s) |
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[Diameter (mm) ] squared |
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| Through any area normal to the direction of flow | |||
| Velocity of Flow (m.s) | = |
1000 * Volumetric Flow (l/s) |
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Area (mm squared) |
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NOTE:
Coefficients are based on:
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