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Maximum Recommended Air Flow (SCFM) Through ANSI Standard Weight Schedule 40 Metal Pipe The flow values in the table below are based on a pressure drop of 10% of the applied pressure per 100 feet of pipe for 1/8", 1/4", 3/8", and 1/2" pipe sizes; and a pressure drop of 5% of the applied pressure per 100 feet of pipe for 3/4", 1", 1-1/4", 2", 2-1/2", 3" pipe sizes. The table gives recommended flows for pipe sizes at listed pressures and should be used to determine appropriate piping for air systems. Applied Nominal Standard Pipe Size Pressure PSI 1/8" 1/4" 3/8" 1/2" 3/4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 5 0.5 1.2 2.7 4.9 6.6 13 27 40 80 135 240 10 0.8 1.7 3.9 7.7 11.0 21 44 64 125 200 370 20 1.3 3.0 6.6 13.0 18.5 35 75 110 215 350 600 40 2.5 5.5 12.0 23.0 34.0 62 135 200 385 640 1100 60 3.5 8.0 18.0 34.0 50.0 93 195 290 560 900 1600 80 4.7 10.5 23.0 44.0 65.0 120 255 380 720 1200 2100 100 5.8 13.0 29.0 54.0 80.0 150 315 470 900 1450 2600 150 8.6 20.0 41.0 80.0 115.0 220 460 680 1350 2200 3900 200 11.5 26.0 58.0 108.0 155.0 290 620 910 1750 2800 5000 250 14.5 33.0 73.0 135.0 200.0 370 770 1150 2200 3500 6100 Water Discharge Table This table is intended for general reference and general applicability only, and should not be relied upon as the sole or precise source of information available with respect to the subject covered. The user should also refer to and follow manufacturer's specific instructions and recommendations with regard to such information, where they exist. Flow of water through 100 foot lengths of hose, Straight-Smooth Bore - U.S. Gallons per minute PSI at Nominal Hose I.D. Diameters - Inches Hose Inlet 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4" 6" 20 26 47 76 161 290 468 997 2895 30 32 58 94 200 360 582 1240 3603 40 38 68 110 234 421 680 1449 4209 50 43 77 124 264 475 767 1635 4748 60 47 85 137 291 524 846 1804 5239 75 53 95 154 329 591 955 2035 5910 100 62 112 180 384 690 1115 2377 6904 125 70 126 203 433 779 1258 2681 7788 150 77 139 224 478 859 1388 2958 8593 200 90 162 262 558 1004 1621 3455 10038 Figures are to be used as a guide since the hose inside diameter tolerance, the type of fittings used, and orifice restriction all influence the actual discharge. Thus, variations plus or minus from the table may be obtained in actual service. Conversion Table - Feet of Water to Inches of Mercury Feet of 1 2 4 6 8 10 12 14 16 20 22 24 26 28 30 32 34 Water Inches of 0.9 1.8 3.5 5.3 7.1 8.8 10.6 12.4 14.1 17.7 19.4 21.2 23.0 24.8 26.5 28.3 30.0 Mercury 528 DPL108 pages518-554.pmd 528 10/5/2007, 10:29 AM
Goodyear Rubber Products
