3/4″ Schedule 40 Pipe | Actual ID = .822

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

FOR EXAMPLE, if Lisa has a line pressure of 80 PSIG with an airflow of 175 SCFM moving through the 100 feet of pipe, she would experience a drop in pressure of approximately 23 Pounds per Square Inch.

Line Pressure
(PSIG)
Free Air (SCFM)
20 40 60 80 90 100 125 150 175
40 0.72 2.72 5.97 10.37 13.10 16.12 24.95 35.60 48.40
60 0.52 2.00 4.37 7.60 9.59 11.80 18.25 26.00 35.45
80 0.41 1.56 3.45 6.00 7.55 9.30 11.40 20.55 27.95
100 0.34 1.29 2.82 4.95 6.22 7.65 11.85 16.95 23.00