Plant engineering calculator · Updated 17 September 2026
Compressed Air Pipe Velocity Calculator — SCFM, Pressure & Bore
Convert free-air flow to approximate line-condition flow and velocity using absolute-pressure ratio, pipe inside diameter and temperature ratio.
Inputs
Live results
- Line flow 66.3 ACFM
- Area 0.0218 ft²
- Velocity 50.6 ft/s
- Velocity 15.43 m/s
Formula and method
Qline=Qfree×Patm/Pabs×Tline/Tstd; V=Qline/A.
Worked example
500 SCFM at 100 psig occupies far less line volume than 500 actual CFM; pressure correction prevents a misleading velocity.
Assumptions and limits
- Ideal-gas scaling is used for screening.
- Pressure varies along a real line; use a pressure-drop model for final distribution sizing.
Frequently asked questions
What does this Compressed Air Pipe Velocity Calculator calculate?
Convert free-air flow to approximate line-condition flow and velocity using absolute-pressure ratio, pipe inside diameter and temperature ratio.
Is this suitable for final design?
Use it as a transparent engineering screen. Verify final decisions against measured data, OEM curves, applicable standards and site operating limits.
Why are assumptions visible?
Plant calculations can look precise while hiding uncertain inputs. MAXScanner keeps the governing assumptions visible so scenarios can be checked and compared.