Compressed air leak cost: turn flow estimates into verified savings
Calculate a leak energy equivalent, keep free-air reference conditions consistent, and check compressor response before promising a saving.
A leak's flow can be converted into an energy equivalent, but repairing that leak does not guarantee the electricity meter falls by exactly that amount. Compressor controls, unload behavior and system pressure determine how reduced air demand becomes reduced electrical input.
Use free-air flow and matching specific power
Suppose an illustrative leak is estimated at 500 L/min of free air. A measured specific power of 7 kW per m³/min gives 0.5 × 7 = 3.5 kW of equivalent compressor input. Over 6,000 pressurized hours, that is 21,000 kWh. At 0.15 currency/kWh, the annual energy equivalent is 3,150 currency units.
The compressed air leak calculator makes these assumptions visible. Free-air flow expresses the volume at stated reference conditions; pipe-volume flow at line pressure is a different quantity. Match the conditions used by the flow estimate and compressor specific-power data.
Pressurized time can exceed production time
A section left pressurized through nights and weekends can leak when the machines are idle. Record when the affected section is actually pressurized. Do not multiply by production hours if the air remains on longer, or by all calendar hours if it is isolated during idle periods.
Likewise, a leak estimate based only on hole diameter is conditional on pressure, geometry and discharge assumptions. Prefer a documented measurement or engineering estimate and retain its uncertainty. Prioritize repair using both energy significance and the process's approved maintenance practices.
Check what the compressor does
A reduction in demand may shorten loaded time but leave a fixed-speed compressor consuming substantial unloaded power. A properly controlled system may instead stop a machine or lower speed. Look at total system kW, pressure and production before and after repair; one compressor's local meter can miss a change in sequencing across the plant.
| Before/after evidence | Why it matters |
|---|---|
| Comparable production and operating hours | Avoid attributing a schedule change to leak repair |
| Header and point-of-use pressure | Confirm the service requirement still holds |
| Loaded, unloaded and stopped time | Explain how demand reduction changes power |
| System input kWh | Verify the realized energy change |
| Repeat leak survey | Detect recurrence and new losses |
Build a small verification loop
Tag the leak location, record the estimated free-air flow and repair date, then review a comparable operating period. Investigate apparent zero savings before assuming the repair failed: controls may need an approved adjustment, or the baseline may be too variable to resolve the change.
Use the industrial energy calculator for the broader schedule and tariff model. Only carry documented realizable savings into the automation business case.
Source
U.S. Department of Energy: determine the cost of compressed air describes duty-dependent costs and a systems approach. The leak example here is an explicit energy-equivalent calculation, not a measured savings claim.
Cite this page: Compressed air leak cost: turn flow estimates into verified savings
, Shopfloor, 2026-10-11. https://shopfloor.space/articles/compressed-air-leak-cost/