Compressed-air calculator
Pressure loss in compressed-air piping
Every metre of pipe, every elbow and every reducer consumes pressure. Excessive pressure loss is paid for in energy: the compressor must run higher to deliver the same pressure at the point of use.
This calculator evaluates the pressure loss of a pipe run from flow, working pressure, internal diameter and equivalent length (Darcy–Weisbach method, Swamee–Jain friction factor).
Pressure loss
Pipe pressure drop (Darcy–Weisbach, Swamee–Jain friction).
Pressure loss
- bar
- —bar
- kPa
- —kPa
To calculate, still needed: the length, the flow, the working pressure.
Calculation details
- Friction factor
- —
- Velocity
- —ft/s
- Inner diameter
- —mm · —in
- Length
- —m · —ft
Standardized inner diameters: steel ASME B36.10 (Schedule 10 / 40 / 80), aluminum per EQOfluids chart (PN16 = 232 psi · PN70 = 1015 psi). Darcy–Weisbach, air properties @ 20 °C / 1 bar abs (ISO 1217).
Indicative estimates: validate all results before any technical decision.