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Compressed Air Pipes - Fittings and Pressure Drops

Fittings in compressed air pipe lines - equivalent length pressure drop

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Pressure drop in compressed air pipe line fittings can be expressed as equivalent length in meters of  pipe line.

Equivalent Pipe Length (m)
FittingNominal Pipe Size (mm)
1520253240506580100125
90o bend 0.15 0.2 0.25 0.35 0.5 0.6 0.8 1.0 1.2 1.5
90o elbow 0.25 0.4 0.5 0.65 0.8 1.0 1.4 1.8 2.4 3.2
Tee - run 0.2 0.3 0.4 0.5 0.7 0.85 1.1 1.3 1.6 2.0
Tee - side outlet 0.5 0.7 1.4 1.8 2.4 2.7 3.6 4.6 5.7 7.0

Example - Compressed Air Pipe Line and Equivalent Length

A 90o bend equals to a 0.6 m 50 mm pipe line.

Equivalent Pipe Length (ft)
FittingNominal Pipe Size (inches)
1/2"3/4"1"1 1/4"1 1/2"2"2 1/2"3"4"5"
90o bend 0.5 0.7 0.8 1.2 1.7 2 2.6 3.3 4 5
90o elbow 0.8 1.3 1.7 2.1 2.6 3.3 4.6 5.9 7.9 10.6
Tee - run 0.7 1 1.3 1.7 2.3 2.8 4.4 4.3 5.3 6.6
Tee - side outlet 1.7 2.3 4.6 5.9 7.9 8.9 11.9 15.1 18.8 23.1

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