Water Lifted By Compressed Air
For Municipal, Manufacturing, Irrigation or Other Water Supply

Air Mains, Initia.] a^nd FinaJ Pressures. Initial Gauge Pressure, 105 Pounds. Keduction of Final Pressure in 500 Feet. Diam. Pipe. ■ 1 lb. j 2 lbs. 3 lbs. 5 lbs. 1 7 lbs. 1 9 lbs. 12 lbs. 1 in. .. 20 29 37 44 52 58 65 IV4 “ - 37 52 68 81 94 ' 105 118 ly, “ ... .. 61 86 111 133 155 172 194 2 “ ... 129 190 245 294 341 380 427 2% “ ... 245 344 44-3 531 617 687 772 3 “ .... .. 401 562 724. 867 1,000 1,120 1,260 3y2 “ .... 599 839 1,080 1,290 1,500 1,670 1,880 4 “ .... 850 1,190 1,530 1,830 2,130 2,370 2,670 “ .... ..I 1,150 1,610 2,070 2,480 2,890 3,220 3,610 . 1,510 2,110 2,720 3,260 3,790 4,220 4,750 6 “ .... .. 2,410 3,380 4,350 5,220 6,070 6,760 7,590 .. 3,580 5,010 6,460 7,740 8,990 10,000 11,200 8 “ .... . 5,030 7,050 9,080 10,800 i 12,600 14,000 15,800 9 “ .... . 6,810 9,540 1 12,200 14,700 1 17,100 19,000 21,4-00 10 “ .... . 8,920 ; 12,500 16,100 19,200 J 22,400 24,900 28,000 Example. It is required to deliver 2,000 cubic feet of equivalent free air at the end of a pipe line 1,500 feet long, the initial pressure being 60 pounds, and the loss of pressure not to exceed 10 pounds; what diameter of pipe must be used? By table of 60 pounds initial pressure under 3 pounds loss, and opposite 5 inch diameter of pipe, we see that the delivery would be 2,000 cubic feet, so that for a pipe line 1,500 feet long, the loss of pressure would be about 3x1,500—500 9 pounds. We say “about” 9 pounds, because the loss is not exactly proportional to the length, but nearly so when the basis of length is 500 feet. Globe Valves, Tees and Elbows. The reduction of pressure produced by globe valves is the same as that caused by the following additional lengths of straight pipe, as calculated by the formula : Additional length of pipe = 114 X diameter of pipe 1 -|- (3.6 diameter) Diameter of pipe) Additional length) 1 1% 2 2% 3 3% 4 5 6 inches 2 4 7 10 13 16 20 28 36 feet 7 8 10 12 15 18 20 22 24 inches TF 53 70 88 115 143 162 181 200 feet The reduction of pressure produced by elbows and tees is equal to two-thirds of that caused by globe valves. The following are the additional lengths of straight pipe to be taken 'into account for elbows and tees. For globe valves multiply by f : Diameter of pipe),,!, ™ 2 2/2 __$ Additional length i 2 3 5 < J 11 13 19 6 inches 24 feet 7 8 10 12 15 18 20 22 24. inches 30—35 Ï7 59 77 96 108 120 134- feet These additional lengths of pipe for globe valves, elbows and tees must be added in each'case to the actual lengths of straight pipe. Thus, a 6-inch pipe, 500 feet long with 1 globe valve, 2 elbows and 3 tees, would be equivalent to a straight pipe 500 - 36 - (2 x 24) -|- (3 x 24) - 656 feet long. 89