Pump Specific Speed Calculator
Explicit dimensionless pumpspecific speedω√Q/(gH)^3/4, radians/second, SIQ/head/gravity. Not rpmmetric/US specific speed or a performance/selection guarantee.
Description
Pump specific speed compares angular speed, discharge and head.
Pump specific speed compares angular speed, discharge and head.1
The dimensionless convention used here includes gravity and differs from unit-dependent rpm definitions. Use this tool to calculate the stated observation or conditional model from supplied measurements.
When to use Pump Specific Speed Calculator
Use this tool to calculate the stated observation or conditional model from supplied measurements. Establish the independently reviewed engineering model, geometry, material properties, units and governing reference edition.
How to use Pump Specific Speed Calculator and understand its results
- Establish the independently reviewed engineering model, geometry, material properties, units and governing reference edition.
- Enter actualPumpRotationalSpeedRadiansPerSecond, actualPumpDischargeCubicMetersPerSecond, actualPumpHeadMeters, callerApplicableGravityMetersPerSecondSquared, using the field meanings and rules below, then run the tool.
- Read result.conditionalDimensionlessPumpSpecificSpeed. Interpret each field using the units, signs and evidence rules below.
- If input validation fails, correct the reported field and run again. Before applying a successful result, check the stated reference scope, units, assumptions and any retained unknown evidence.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualPumpRotationalSpeedRadiansPerSecond | Actual pump rotational speed radians per second | number | Required |
| actualPumpDischargeCubicMetersPerSecond | Actual pump discharge cubic meters per second | number | Required |
| actualPumpHeadMeters | Actual pump head meters | number | Required |
| callerApplicableGravityMetersPerSecondSquared | Caller applicable gravity meters per second squared | number | Required |
Require positive angular speed in rad/s, head in meters and gravity in m/s², with nonnegative discharge in m³/s. Calculate omega×sqrt(Q)/(gH)^(3/4). Zero discharge returns zero; no rpm conversion or empirical specific-speed units are substituted.
dimensionlessPumpSpecificSpeed=omegaRadPerS×sqrt(dischargeM3PerS)/(gravityMPerS2×headMeters)^(3/4) Apply the field units and exact ordering, boundary and evidence rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result containing the calculation or selected reference fields below | object |
| result.conditionalDimensionlessPumpSpecificSpeed | Conditional Dimensionless Pump Specific Speed; use the units, sign convention and calculation stated above | number |
{
"input": {
"actualPumpRotationalSpeedRadiansPerSecond": 2,
"actualPumpDischargeCubicMetersPerSecond": 4,
"actualPumpHeadMeters": 1,
"callerApplicableGravityMetersPerSecondSquared": 1
},
"output": {
"result": {
"conditionalDimensionlessPumpSpecificSpeed": 4
}
}
}Limitations and assumptions
The dimensionless convention used here includes gravity and differs from unit-dependent rpm definitions. Results depend on the independently established measurement basis and the exact model assumptions above.
Every listed input requires an explicit value. Unexpected fields, incorrect value types, nonfinite numbers and sparse numeric arrays fail validation; tool-specific bounds and alignment rules apply as described above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful calculation that reports a false comparison or retains unknown evidence.
Alternative or Complementary methods
Use Turbine Specific Speed Calculator to examine a related aspect: Turbine specific speed compares rotational behavior, power, head and fluid properties.
Use Bolt Preload Torque Calculator where its separate inputs and scope apply: A nut-factor torque model estimates tightening torque from preload and bolt diameter.
References
-
Pump Specific Speed Calculator — tool.io
Similar or alternative tools
- Turbine Specific Speed Calculator
Turbine specific speed compares rotational behavior, power, head and fluid properties.
- Bolt Preload Torque Calculator
A nut-factor torque model estimates tightening torque from preload and bolt diameter.