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PF-065 · Verified method

Air Compressor Sizing Calculator

Size compressor capacity from summed demand, utilization and reserve.

Inputs

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ENGINEERING GUIDE

Use the Air Compressor Sizing Calculator to estimate required compressor CFM/FAD from connected equipment demand, simultaneity, leakage allowance and reserve. The result keeps each sizing assumption explicit.

How to interpret the result

Treat the calculated CFM/FAD as a capacity requirement for the stated demand case, not as a compressor model recommendation. Verify pressure, reference-flow basis, duty profile, redundancy and manufacturer performance data before equipment selection.

Formula and methodology

PneumaForge applies this verified method: Demand aggregation + explicit reserve factors. The functional engine is shared with related tools in the compressor-demand family, while this page solves the specific intent represented by air compressor sizing calculator.

Demand aggregation + explicit reserve factors

Variables and inputs

  • Connected equipment demand
  • Simultaneity
  • Leakage allowance
  • Reserve

Worked example

Reproducible example: start with the calculator's default values (Connected equipment demand = 2000; Simultaneity = 80; Leakage allowance = 10; Reserve = 15) and calculate the result. Then change the variable most relevant to your application and compare the new required fad/scfm; recommended capacity range against the baseline.

Assumptions and limits

Duty/simultaneity/reserve are explicit assumptions; no hidden diversity factor.

Engineering tips

  • Use FAD or another clearly stated reference flow consistently across compressor comparisons.
  • Prefer measured package input power or CAGI/OEM data when comparing real machines.
  • Separate peak demand, average demand and redundancy requirements before selecting installed capacity.
  • Keep the inputs used for air compressor sizing calculator on a consistent engineering basis before comparing alternatives.

Frequently asked questions

What does the Air Compressor Sizing Calculator calculate?

It is designed to size compressor capacity from summed demand, utilization and reserve. The reported outputs are required fad/scfm; recommended capacity range.

What inputs does the Air Compressor Sizing Calculator use?

The calculator uses Connected equipment demand, Simultaneity, Leakage allowance and Reserve. Only use values that represent the same operating condition or design case.

What formula or method is used?

The calculation follows: Demand aggregation + explicit reserve factors. The page also states the assumptions that define where the method is valid.

Which assumptions can affect the result?

Duty/simultaneity/reserve are explicit assumptions; no hidden diversity factor.

Can I use different units?

Yes. PneumaForge converts supported units through canonical engineering units. For compressed-air reference flows and pressure bases, the reference pressure and temperature must also remain consistent.

Technical sources