What does an air leak cost?
Quantify air, energy and money lost through leaks. Measured flow is the best input.
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Example data – these are not your operating figures. Adjust them before calculating.
Result
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How we calculate
Method: Known flow: volume = flow × 60 × hours. Hole: isentropic discharge of an ideal gas to the atmosphere, γ = 1.4; critical pressure ratio 0.5283. Below the critical ratio, flow is choked. Mass flow is converted to 1.01325 bar abs and 20 °C. Energy = volume × specific energy consumption.
Assumptions and limitations: A hole calculation provides only an indicative estimate, not a measurement. Pressure and flow remain constant over the entered hours. Simple annual balance excluding VAT, discounting, financing and price increases. This is not an energy audit under ISO 11011.
Method references- NASA Glenn: Mass Flow Rate Equations – critical and subcritical gas flow.
- CAGI Compressed Air & Gas Handbook, chapter 4, 2021 – system design, storage and pressure losses.
Method version 1.0. Standard references verified in the ISO catalogue; the physical balances are not calculations prescribed by ISO. Before final design, we will verify actual operating and catalogue data.