Compressed Air Pipe Lines - Online Pressure Drop Calculator

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The pressure drop in compressed air lines can be calculated by using the formula

dp = 7.57 q^1.85 L 10⁴ / d⁵ p         (1)

where

dp = pressure drop (kg/cm²)

q = air volume flow at atmospheric conditions (FAD) (m³/min)

L = length of pipe (m)

d = inside diameter of pipe (mm)

p = initial abs. pressure (kg/cm²)

• 1 kg/cm² = 98068 Pa = 0.98 bar = 0.97 atmosphere = 736 mm Hg = 10000 mm H₂O = 10 m H₂O = 2050 psf = 14.2 psi = 29 in Hg = 394 in H₂O = 32.8 ft H₂O

Online Compressed Air Pipeline Pressure Drop Calculator - Metric Units

The calculator below can used to calculate the pressure drop in compressed air pipelines.

Online Compressed Air Pipeline Pressure Drop Calculator - Imperial Units

The calculator below can used to calculate the pressure drop in compressed air pipelines.

Compressed Air Pipeline Pressure Drop Spreadsheet

Calculations can be done for other pressures and/or pipe lengths by using this excel spreadsheet (metric units).

The same spreadsheet including different types of pipes (imperial units).

• Compressed Air Pipeline Pressure Drop Diagrams

Compressed Air Pipeline Pressure Drop Table - Initial abs. Pressure 7 kg/cm² (100 psig)

Pressure drops in 100 m (330 ft) compressed air  schedule 40 steel pipe lines are indicated in the tables below:

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Related Topics

• Gas and Compressed Air - Gas properties, capacities of pipelines, sizing of relief valves - air, LNG, LPG and more

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