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Plant Engineering Calculator

Updated Sep 18, 2026

Compressed Air Leakage Percentage Calculator — Load/Unload Test & Cost

Estimate leakage fraction from compressor load/unload timing during a no-production test, then convert leakage flow into annual energy and cost using specific power.

Live calculationWorking shownPrivate in browser

Inputs

Results

Leakage 20.0%
Leak flow 100.0 CFM
Leak power 18.0 kW
Annual energy 108000 kWh
Annual cost $12960
More actions

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Formula

leak%=Tload/(Tload+Tunload); Qleak=capacity×leak%.

Your calculation, step by step

These steps use the values currently entered above so the result can be checked independently.

  1. 1.Load/unload test cycle = 2.000 + 8.000 = 10.000 min.
  2. 2.Leak fraction = loaded time ÷ total cycle = 2.000 ÷ 10.000 = 0.20000 = 20.00%.
  3. 3.Leak flow = 500.00 × 0.20000 = 100.000 CFM; power = 100.000 × 18.000 ÷ 100 = 18.000 kW.
  4. 4.Annual leakage energy = 18.000 × 6000 = 108000.0 kWh; value = $12960.00.

How to use this calculator

  1. Enter measured or design values using the units shown beside each field.
  2. Review the live results and the substituted calculation steps before using the estimate.
  3. Check the assumptions below, then continue to a related calculator when the next engineering decision needs another model.

Worked example

A compressor loaded 2 min and unloaded 8 min during a no-production test indicates about 20% of capacity as leakage under the test assumptions.

Assumptions and limits

  • Test should be performed with production air demand isolated or known.
  • Controls, receiver volume and pressure band must be stable enough for the timing method.

How to interpret the result

Treat the primary result as an engineering screening value, then use the secondary outputs to understand scale, energy or operating impact. Confirm site measurements, equipment limits and applicable standards before making a design or control change.

Questions engineers ask

What assumption makes the load/unload timing leakage method work?

The test assumes production demand is isolated or otherwise known, and the compressor cycles around a stable pressure band. Then loaded time divided by total cycle time approximates the fraction of compressor capacity replacing leakage.

Why can receiver volume and control settings affect the test?

Load/unload timing depends on how quickly system storage rises and falls through the control band. Unstable controls, changing pressure band or active plant demand can distort the simple timing fraction.

Does leak percentage equal percentage of electricity wasted?

No. The owner first converts leakage flow to power using the entered specific power. Compressor part-load behavior can make actual energy response differ, so measured package performance is preferred for a detailed assessment.

Continue the calculation

Use the next calculator in the same engineering workflow instead of restarting from search.

compressed air leakcompressor specific powercompressed air demand profile
Methodology. MAXScanner shows the governing formula, entered values and calculation outputs so the estimate is auditable. The calculator is a screening aid; assumptions and equipment-specific limits remain part of the engineering review.