The Sullivan Air Lift Pumping System
År: 1917
Forlag: Sullivan Machinery Company
Sted: Chicago
Sider: 40
UDK: 621.65-69 Sull
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Loss of Air Pressure in Pipes, due to Friction;
Applies to all Pressures and for Volumes up
to 3000 Cu. Ft. of Free Air
Cubic Feet of Free Air per Minute Divide the number corresponding to the diameter of the pipe and volume in cu. ft. of free air by the ratio of compressions from free air. The result is the loss in pounds per sq. inch in 1000 feet of pipe. *See example.
Diameter of Pipe in Inches
% 1 2 2^ 3 3^-
6 12 24 48 75 100 125 150 200 250 300 43.5 173. 753. 5.7 22.8 91. 362. 1.4 5.3 21. 85. 200. 373. .4 1.5 5.9 23.5 57. 92. 163. 230. 368. 2.2 8.5 21. 37.5 59. 83.5 150. 216. 338. 2. 4.9 8.7 13.6 19.5 35. 54.5 79. 1.6 2.7 4.4 6.3 10.8 17.7 25.3 2.3 3.7 6.4 9 3 2.9 4.2
2 2^ 3 3^ 4 V/2 5 6 7
350 400 450 500 600 700 800 900 1000 1200 1400 1600 1800 2100 2400 2700 3000 105. 140. 174. 216. 316. 33. 45. 55. 68. 100. 133. 172. 219. 272. 400. 12.7 14.8 20.7 26. 37. 51. 59. 83. 104. 148. 204. 236. 332. 5.5 7.1 9.4 11.1 16.6 21.8 29. 38. 44. 67. 87. 114. 150. 196. 266. 2.7 3.6 4.1 5.6 7.3 10.9 14.3 16.5 22. 29. 44. 57. 66. 98. 117. 149. 201. 1.9 2.3 2.9 4. 5.8 7.5 9.2 11.7 16. 23. 30. 35. 52. 65. 82. 100. 1.7 2.5 3.4 4.4 5.4 6.8 9.6 14. 18. 22. 30. 38. 49. 60. 1.8 2.2 2.8 3.9 5.5 7.1 8.8 12.5 15.5 19.5 24. 1.4 1.9 2.6 3.1 4.3 5.9 7.7 9.8 12.
♦Example:
What is the loss of pressure and the terminal pressure with 350 cu. ft. of free air
compressed to 90 lbs.? Initial gauge pressure passing through 500 ft. of 2 in. pipe.
From the table it will be seen that the number corresponding to the diameter of
pipe and the volume mentioned is 105.
90 4~ J4-Z _ - j Atmospheres or Compressions.
IV
I000' = 2 I0S- = 52.5 = 7-4 Lbs. Loss.
500' 2 7-1
90 Lbs. Initial — 7.4 Lbs. Loss = 82.6 Lbs. Terminal pressure.
This table is adapted from Elmo G. Harris’ Formula P— c —■ X “■—
in Compressed Air. McGraw-Hill Book Co., 1910. J a6 r
f=Loss of pressure per sq. inch.
c=An experimental coefficient.
1=» Length of pipe in feet.
d=Diameter of pipe in inches.
Va=Cubic feet of free air passing per second.
r=Ratio of compressions from free air.
Values for “C” Used
d= in. M i 2 3 3^ 4 4^ 5 67
C” 1.47 1.21 1.3s 1.16 1.02 i .95 .9 .86 .82s .775 -7IS .825 .8
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