Plumbing Pump Affinity Flow Calculator
Calculate actual measured pump flow affinity scenario at caller speed under independently verified same-impeller/fluid similarity; exponent 1, not a pump curve intersection, efficiency guarantee or operating instruction.
Description
Pump affinity flow scales directly with speed under fixed impeller and fluid similarity.
Pump affinity flow scales directly with speed under fixed impeller and fluid similarity. The system curve can alter the operating flow.1
The returned values include Ideal query flow liters minute, Ideal speed ratio. The How section below explains the calculation, input rules and interpretation.
When to use Plumbing Pump Affinity Flow Calculator
Use Plumbing Pump Affinity Flow Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No pump selection, efficiency guarantee or operating instruction is supplied.
Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.
How to use Plumbing Pump Affinity Flow Calculator and understand its results
- Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.
- Enter observedReferenceFlowLitersMinute, observedReferenceSpeedRpm, callerQuerySpeedRpm, callerSameImpellerAndFluidVerified using the field table and calculation rules, then run the tool.
- Read idealQueryFlowLitersMinute, idealSpeedRatio. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| observedReferenceFlowLitersMinute | Observed reference flow liters minute | number | Required |
| observedReferenceSpeedRpm | Observed reference speed rpm | number | Required |
| callerQuerySpeedRpm | Caller query speed rpm | number | Required |
| callerSameImpellerAndFluidVerified | Caller same impeller and fluid verified | boolean | Required |
Enter nonnegative reference flow, positive reference and query speeds, and a true independently verified same-impeller/fluid flag. A false flag is an input error. Return ideal flow and speed ratio.
ratio=queryRpm/referenceRpm; queryFlow=referenceFlow×ratio Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| idealQueryFlowLitersMinute | Ideal query flow liters minute | number |
| idealSpeedRatio | Ideal speed ratio | number |
{
"input": {
"observedReferenceFlowLitersMinute": 100,
"observedReferenceSpeedRpm": 1000,
"callerQuerySpeedRpm": 1500,
"callerSameImpellerAndFluidVerified": true
},
"output": {
"idealQueryFlowLitersMinute": 150,
"idealSpeedRatio": 1.5
}
}Limitations and assumptions
No pump selection, efficiency guarantee or operating instruction is supplied.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Plumbing Pump Affinity Head Calculator: Pump affinity head scales with speed squared under fixed impeller and fluid similarity. It estimates a corresponding ideal point. For a complementary task, use Plumbing Pump Affinity Power Calculator: Pump affinity power scales with the cube of speed under fixed impeller and fluid similarity. Actual system operation can depart from that ideal.
References
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Plumbing Pump Affinity Flow Calculator — tool.io
Similar or alternative tools
- Plumbing Pump Affinity Head Calculator
Pump affinity head scales with speed squared under fixed impeller and fluid similarity. It estimates a corresponding ideal point.
- Plumbing Pump Affinity Power Calculator
Pump affinity power scales with the cube of speed under fixed impeller and fluid similarity. Actual system operation can depart from that ideal.