Machinery's Handbook, 31st Edition
2778 FLOW AND ENERGY LOSS IN PIPE, TUBE, AND FITTINGS Table 21. Values of Coefficient C Dia. of Pipe C Dia. of Pipe C Dia. of Pipe C Feet Inches Feet Inches Feet Inches 0.1 1.2 23 0.8 9.6 46 3.5 42 64 0.2 2.4 30 0.9 10.8 47 4.0 48 66 0.3 3.6 34 1.0 12.0 48 5.0 60 68 0.4 4.8 37 1.5 18.0 53 6.0 72 70 0.5 6.0 39 2.0 24.0 57 7.0 84 72 0.6 7.2 42 2.5 30.0 60 8.0 96 74 0.7 8.4 44 3.0 36.0 62 10.0 120 77 The quantity of air discharged in cubic feet per second is the product of the velocity as obtained from the preceding formula and the area of the pipe in square feet. The horse power required to drive air through a pipe equals the volume of air in cubic feet per second multiplied by the pressure in pounds per square foot, and this product divided by 550. Volume of Air Transmitted Through Pipes, in CFM
Actual Inside Diameter of Pipe, Inches
Velocity of Air in Feet per Second
1
2
3
4
6
8
10
12
16
24
0.33 0.65 0.98 1.31 1.64 1.96 2.29
1.31 2.95
5.2 11.8 20.9 32.7
47.1 83.8 188 94.2 167.5 377
1 2 3 4 5 6 7 8 9
2.62 5.89 10.5 23.6 41.9 65.4
3.93 8.84 15.7 35.3 62.8 98.2 141.4 251.3 565 5.24 11.78 20.9 47.1 83.8 131.0 188.0 335.0 754
6.55 14.7 7.85 17.7 9.16 20.6
26.2 59.0 104.0 163.0 235.0 419.0 942 31.4 70.7 125.0 196.0 283.0 502.0 1131 36.6 82.4 146.0 229.0 330.0 586.0 1319 41.9 94.0 167.0 262.0 377.0 670.0 1508 47.0 106.0 188.0 294.0 424.0 754.0 1696 52.0 118.0 209.0 327.0 471.0 838.0 1885 63.0 141.0 251.0 393.0 565.0 1005.0 2262 78.0 177.0 314.0 491.0 707.0 1256.0 2827 94.0 212.0 377.0 589.0 848.0 1508.0 3393
2.62 10.50 23.5 2.95 11.78 26.5 3.27 13.1 29.4 3.93 15.7 35.3 4.91 19.6 44.2 5.89 23.5 53.0
10 12 15 18 20 24 25 28 30
6.55 26.2 59.0 105.0 235.0 419.0 654.0 942.0 1675.0 3770 7.86 31.4 71.0 125.0 283.0 502.0 785.0 1131.0 2010.0 4524 8.18 32.7 73.0 131.0 294.0 523.0 818.0 1178.0 2094.0 4712 9.16 36.6 82.0 146.0 330.0 586.0 916.0 1319.0 2346.0 5278 9.80 39.3 88.0 157.0 353.0 628.0 982.0 1414.0 2513.0 5655
Flow of Compressed Air in Pipes.— When there is a comparatively small difference of pressure at the two ends of a pipe, the volume of flow in cubic feet per minute is found by the formula: V 58 = where V = volume of air in cubic feet per minute p = difference in pressure at the two ends of the pipe in pounds per square inch d = inside diameter of pipe in inches pd 5 WL -----
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