3/8″ Schedule 40 Pipe | Actual ID = .494

The table below shows the airflow pressure drop in Pounds per Square Inch per 100 feet of schedule 40 pipe.

FOR EXAMPLE, if Peter has a line pressure of 60 PSIG with an airflow of 10 SCFM moving through the 100 feet of pipe, he would experience a drop in pressure of approximately 1.95 Pounds per Square Inch.

Line Pressure
(PSIG)
Free Air (SCFM)
5 10 15 20 25 30 35 40
40 0.70 2.65 4.70 10.00 15.40 22.00 29.80 38.60
60 0.55 1.95 3.40 7.30 11.25 16.10 21.80 28.25
80 0.40 1.50 2.70 5.75 8.90 12.70 17.20 22.30
100 0.35 1.25 2.25 4.75 7.35 10.50 14.20 18.40