Toolnoza

ENGINEERING TOOL

Compressed Air Pressure Drop Calculator

Estimate low-loss pipe pressure drop, velocity and Reynolds number using Darcy–Weisbach.

Compressed Air Pressure Drop Calculator

FREE ONLINE TOOL

Pressure drop

0.0295 bar

Air velocity

4.2933 m/s

Reynolds number

56,468.9155

Darcy friction factor

0.0255

Loss / inlet absolute pressure

0.3681 %

Estimated outlet absolute pressure

7.9838 bar(a)

Formula and assumptions

Δp = (fL/D + ΣK)ρv²/2; ρ = Pabs/(287.05T); f = 64/Re or Haaland

Constant inlet-density approximation for dry air; viscosity 1.81×10⁻⁵ Pa·s. Only for loss below 10% of inlet absolute pressure and Mach below 0.3. Transitional flow is uncertain. For larger losses use a compressible-flow model; no compressor or receiver sizing.

Technical reference: Atlas Copco — Compressed Air Manual

STEP BY STEP

How to use compressed air pressure drop calculator

  1. Check the input units and assumptions.
  2. Review the result and example.

IN PRACTICE

Example

1000 L/min free air, 7 bar(g), ID 25 mm, 30 m, roughness 0.045 mm, K = 3; compare the pressure loss with the inlet pressure.

GOOD TO KNOW

Which model does this calculator use?

Constant inlet-density approximation for dry air; viscosity 1.81×10⁻⁵ Pa·s. Only for loss below 10% of inlet absolute pressure and Mach below 0.3. Transitional flow is uncertain. For larger losses use a compressible-flow model; no compressor or receiver sizing.

+

Related tools

Compressed Air Leak Cost CalculatorOpen toolPneumatic Cylinder Air Consumption CalculatorOpen toolCompressor Duty Cycle CalculatorOpen toolAir Receiver Tank Sizing CalculatorOpen toolCompressed Air Pipe Size CalculatorOpen toolCompressor Tank Fill Time CalculatorOpen tool