# Compressed Air - Pressure Drop in Pipe Lines - Online Pressure Drop Calculator

## Calculate pressure drops in compressed air pipe lines - Online Pressure Drop Calculator and Spreadsheets - metric and imperial units

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

dp = 7.57 q^{1.85}L 10^{4}/ (d^{5}p) (1)

where

dp= pressure drop (kg/cm^{2})

q= air volume flow at atmospheric conditions (FAD)(m^{3}/min)

L= length of pipe (m)

d= inside diameter of pipe (mm)

p= initial abs. pressure (kg/cm^{2})

*1 kg/cm*^{2}= 98068 Pa = 0.98 bar = 0.97 atmosphere = 736 mm Hg = 10000 mm H_{2}O = 10 m H_{2}O = 2050 psf = 14.2 psi = 29 in Hg = 394 in H_{2}O = 32.8 ft H_{2}O

**Note!** - pressure is "force per unit area" and commonly used pressure units like *kg/cm*^{2} and similar are in principle not correct since *kg* is a mass unit. A mass must be multiplied with gravity *g* to be a force (weight).

### 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.

NOTE! Pressure drops above 1 kg/cm2 (14-15 psi) are in general not relevant. The formula used may not be valid.

### 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).

Or, alternatively - Compressed Air - Pressure Drop in Pipe Lines - in Google Docs. You can open, save and modify your own copy of the Google spreadsheet if you are signed into your Google Account.

### Compressed Air Pipeline Pressure Drop Table - Initial abs. Pressure *7 kg/cm*^{2} (100 psig)

^{2}(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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