Discharge of Air Through an Orifice

Loss of Pressure in PSI Per Pipe ID
 Angle of Bend 1/2″ 3/4″ 1″ 1 (1/4)” 1 (1/2)” 2″
45° 1.38 0.09 0.03 0.007
90° 1.42 0.34 0.10 0.026 0.012

 

Gauge Pressure
Before Orifice
in PSI
Diameter of Orifice
 1/64″ 1/32″ 1/16″ 1/8″ 1/4″
Discharge in Cubic Feet of Free Air Per Minute
90 .370 1.48 5.92 23.70 94.80
100 .406 1.62 6.49 26.00 104.00
110 .441 1.76 7.05 28.20 113.00
120 .476 1.91 7.62 30.50 122.00
125 .494 1.98 7.90 37.60 126.00
150 .582 2.37 9.45 37.50 150.00
200 .761 3.10 12.35 49.00 196.00
250 .935 3.80 15.18 60.30 241.00
300 .995 4.88 18.08 71.80 287.00
400 1.220 5.98 23.81 94.50 378.00
500 1.519 7.41 29.55 117.30 469.00
750 2.240 10.98 43.85 174.00 696.00
1000 2.985 14.60 58.21 58.21 231.00
Gauge Pressure
Before Orifice
in PSI
Diameter of Orifice
 3/8″ 1/2″ 5/8″ 3/4″ 7/8″ 1″
Discharge in Cubic Feet of Free Air Per Minute
90 213.00 379.00 592.00 853.00 1162.00 1516.00
100 294.00 415.00 649.00 934.00 1272.00 1661.00
110 254.00 452.00 705.00 1016.00 1383.00 1806.00
120 274.00 488.00 762.00 1097.00 1494.00 1951.00
125 284.00 506.00 790.00 1138.00 1549.00 2023.00
150 338.00 600.00 910.00 1315.00 1789.00 2338.00
200 441.00 784.00 1225.00 1764.00 2401.00 3136.00
250 542.00 964.00 1508.00 2169.00 2952.00 3856.00
300 646.00 1148.00 1795.00 2583.00 3515.00 4592.00
400 851.00 1512.00 2360.00 3402.00 4630.00 6048.00
500 1055.00 1876.00 2930.00 4221.00 5745.00 7504.00
750 1566.00 2784.00 4350.00 6264.00 8525.00 11136.00
1000 924.00 2079.00 5790.00 8316.00 11318.00 14784.00

NPE provides these calculators and guides to assist with general queries and recommends working with experts to ensure suitability.
NPE assumes no responsibility or liability for any errors, omissions or misuse of the contents of this site.
These online tools do not constitute professional advice.
For assistance, contact any of NPE’s Australian branches.

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