Plant Utilities worked example

Compressed Air Storage Buffer with usable receiver volume of 1,500 gal: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop usable receiver volume to 1,500 gal, then walk the calculation through step by step. Estimate protected minutes of compressed air receiver buffer from usable storage, demand, and safety factor.

The inputs for this scenario

  • Usable receiver volume: 1,500 gal (the input this scenario stresses; the baseline uses 3,000)
  • Compressed air demand: 180 gal / min (held at the documented default)
  • Safety factor: 1.2 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Unprotected buffer time = usable receiver volume รท compressed air demand.
  • Protected days of supply works out to 6.94 min at these inputs, and this is the headline figure for the scenario.
  • Unprotected days works out to 8.33 days at these inputs.
  • Inventory works out to 1,500 pieces at these inputs.
  • Compressed air demand works out to 180 gal / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where usable receiver volume sits at 3,000 gal and the headline result is 13.89 min, this scenario comes in 50% below the baseline at 6.94 min.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to usable receiver volume, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes constant demand and treats the full usable volume as available, but real drawdown ends when tank pressure falls below the minimum a process can tolerate, so effective buffer is often shorter.

Results at a glance

  • Protected days of supply: 6.94 min (headline result)
  • Unprotected days: 8.33 days
  • Inventory: 1,500 pieces
  • Compressed air demand: 180 gal / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Compressed Air Storage Buffer calculator, set usable receiver volume to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.