You are here: Home > Pump Tools > Pumping Formulas
Pumping Formulas
Pumping Formula for any liquid
Volumic flow from mass flow & density |
||
|---|---|---|
| For any liquid | ||
| Vol flow (l/s) | = | 1000 * Mass Flow (kg/s) Density (kg/m3) |
Head of liquid from pressure & density |
||
| For any liquid | ||
| Head (m) | = | 102.0 * Pressure (kPa) Density (kg/m3) |
Pump input power from pump performance |
||
| For any liquid | ||
| Power (kW) | = | Density (kg/m3) * Volumetric Flow (l/s) * Head (m) 1000 * 102.0 * Efficiency (decimal) |
Pump input power from kilowatt - hour meter |
||
| Power (kW) | = | 36 * Disc.Revs. * Meter Ratio Constant * Motor Efficiency (dec) Time (s) * Meter Disc. Constant (rev/kW-h) |
Pump input power from current and voltage |
||
| Power (kW) | = | Current (A) * Voltage (V) * Motor Efficiency (dec) * Pump Efficiency (dec) 57 735 |
Motor input energy per volume of liquid pumped |
||
| For any liquid | ||
| Energy/ Volume (kW-h/kl) | = | Density (kg/m3) * Head (m) 367 347 * Motor Efficiency (dec) * Pump Efficiency (dec) |
Pump input power from engine |
||
| Power (kW) | = | Pi * Torque (N.m) * Speed (rpm) 30 000 |
| = | Torque (N.m) * speed (rpm) 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) 102.2 * Efficiency (decimal) |
Motor input energy per volume of liquid pumped |
||
| energy/volume (kW-h/kl) | = | Head (m) 368.0 * Motor efficiency (dec) * pump efficiency (dec) |
Average velocity of flow |
||
| Through a circular section | ||
| Velocity of flow (m/s) | = | 1273 * Volumetric Flow (l/s) [Diameter (mm) ] squared |
Through any area normal to the direction of flow |
||
| Velocity of Flow (m.s) | = | 1000 * Volumetric Flow (l/s) Area (mm2) |
