Compressed Air - Pressure Drop Diagrams, Metric Units

Pressure loss in compressed air pipe lines. Pressure drop can be estimated for typical entering pressures. The diagrams are calculated for schedule 40 pipes.

Compressed Air Pipeline Pressure Drop Calculator

Pressure loss in compressed air pipe lines measured in kg/m² per 100 m of pipe for various entering pressures.

The diagrams below are calculated for schedule 40 pipes.

Unit Conversions

1 kg/cm² = 0.98 bar = 735 mmHg = 10000 mmH₂O = 14.2 psi
1 m³/min = 0.017 m³/s = 60 m³/h = 1000 liter/min = 35.3 cfm
1 m (meter) = 3.2808 ft = 39.37 in

Schedule 40 Pipe Pressure Drop Reference Tables

Pipe Diameter (mm)	Pressure 5 kg/cm² (kg/m²/100m)	Pressure 7.5 kg/cm² (kg/m²/100m)	Pressure 10 kg/cm² (kg/m²/100m)	Pressure 13 kg/cm² (kg/m²/100m)
13	45.5	40.2	36.8	34.2
16	20.1	17.8	16.3	15.1
19	10.2	9	8.3	7.7
25	3.8	3.4	3.1	2.9
32	1.2	1.1	1	0.9
38	0.5	0.5	0.4	0.4
50	0.1	0.1	0.1	0.1

Pressure Drop Calculation for Non-Schedule 40 Pipes

For pipes other than schedule 40, use the following formula:

dp = dp₄₀ × (d₄₀ / d)⁵

Where:

dp = actual pressure drop (kg/m² per 100 m pipe)
dp₄₀ = pressure drop in schedule 40 pipe from table above (kg/m² per 100 m pipe)
d₄₀ = inside diameter schedule 40 pipe (mm)
d = actual inside diameter (mm)

Calculator

Inputs

Pressure Drop Schedule 40 (kg/m² per 100m) (kg/m²)

Schedule 40 Inside Diameter (mm)

Actual Inside Diameter (mm)

Results

Actual Pressure Drop-- kg/m² per 100m

Compressed Air - Pressure Drop Diagrams, Metric Units | MEPKit Engineering Tools | MEPKit