1″ Schedule 40 Pipe | Actual ID = 1.045

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

FOR EXAMPLE, if Joe has a line pressure of 80 PSIG with an airflow of 150 SCFM moving through the 100 feet of pipe, he would experience a drop in pressure of approximately 5.88 Pounds per Square Inch.

Line Pressure
(PSIG)
Free Air (SCFM)
50 100 150 200 250 275 300 325 350
40 1.20 4.63 10.20 17.90 27.86 33.50 39.82 46.75 54.00
60 0.87 3.38 7.45 13.10 20.40 24.50 29.15 34.20 39.60
80 0.68 2.65 5.88 10.32 16.10 19.35 23.00 27.00 31.22
100 0.57 2.20 4.85 8.50 13.10 15.93 18.95 22.28 58.77