Plumbing Compressed Air Leak Rate Calculator
Infer actual isolated constant-temperature pressure-decay free-air inventory leak, no leak aperture/choked-orifice model, pressure test instructions or cause diagnosis.
Description
An isolated pressure-decay test estimates lost free-air inventory at constant gas temperature.
An isolated pressure-decay test estimates lost free-air inventory at constant gas temperature. Thermal pressure changes would confound the estimate.1
The returned values include Modeled free air leak liters minute. The How section below explains the calculation, input rules and interpretation.
When to use Plumbing Compressed Air Leak Rate Calculator
Use Plumbing Compressed Air Leak Rate Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No leak-aperture model, test procedure or cause diagnosis 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 Compressed Air Leak Rate 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 observedIsolatedSystemVolumeLiters, observedInitialAbsoluteKpa, observedFinalAbsoluteKpa, observedPressureDecayMinutes, callerAtmosphericAbsoluteKpa, callerConstantGasTemperatureVerified using the field table and calculation rules, then run the tool.
- Read modeledFreeAirLeakLitersMinute. 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 |
|---|---|---|---|
| observedIsolatedSystemVolumeLiters | Observed isolated system volume liters | number | Required |
| observedInitialAbsoluteKpa | Observed initial absolute kpa | number | Required |
| observedFinalAbsoluteKpa | Observed final absolute kpa | number | Required |
| observedPressureDecayMinutes | Observed pressure decay minutes | number | Required |
| callerAtmosphericAbsoluteKpa | Caller atmospheric absolute kpa | number | Required |
| callerConstantGasTemperatureVerified | Caller constant gas temperature verified | boolean | Required |
Enter nonnegative system liters and positive initial/final absolute kPa, duration and atmospheric kPa. Require final≤initial and a true independently verified constant-temperature flag; otherwise report an input error. Return modeled free-air L/min.
freeAirLeakL/min=systemLiters×(initialAbsolute−finalAbsolute)/atmosphericAbsolute/minutes Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| modeledFreeAirLeakLitersMinute | Modeled free air leak liters minute | number |
{
"input": {
"observedIsolatedSystemVolumeLiters": 100,
"observedInitialAbsoluteKpa": 300,
"observedFinalAbsoluteKpa": 250,
"observedPressureDecayMinutes": 5,
"callerAtmosphericAbsoluteKpa": 100,
"callerConstantGasTemperatureVerified": true
},
"output": {
"modeledFreeAirLeakLitersMinute": 10
}
}Limitations and assumptions
No leak-aperture model, test procedure or cause diagnosis 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 Compressed Air Receiver Size Calculator: An ideal receiver supplies a free-air deficit through its absolute-pressure swing. Free-air and compressed receiver volumes use different pressure bases. For a complementary task, use Plumbing Compressed Air Pipe Sizing Calculator: Compressed-air pipe candidates need enough actual-volume flow with acceptable pressure loss. Free-air conversion must be done separately.
References
Similar or alternative tools
- Plumbing Compressed Air Receiver Size Calculator
An ideal receiver supplies a free-air deficit through its absolute-pressure swing. Free-air and compressed receiver volumes use different pressure bases.
- Plumbing Compressed Air Pipe Sizing Calculator
Compressed-air pipe candidates need enough actual-volume flow with acceptable pressure loss. Free-air conversion must be done separately.