. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 22 BULLETIN^ 57, U. S. DEPARTMENT OF AGRICULTURE. lifted more than 100 feet, or where the working pressure on the pump does not exceed 65 pounds. Figure 18 illustrates the appUcation of this system to a farm home. The water level in shal- low wells is usually near enough to the surface to be within the limits of suction. The limiting practical suction lift for a pump is about 20 feet, although it will vary with the elevation above sea level. This means that the pump cylinder which raises the water by suction in lift pu
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 22 BULLETIN^ 57, U. S. DEPARTMENT OF AGRICULTURE. lifted more than 100 feet, or where the working pressure on the pump does not exceed 65 pounds. Figure 18 illustrates the appUcation of this system to a farm home. The water level in shal- low wells is usually near enough to the surface to be within the limits of suction. The limiting practical suction lift for a pump is about 20 feet, although it will vary with the elevation above sea level. This means that the pump cylinder which raises the water by suction in lift pumps and which raises by suction and also forces the water in force pumps should not be more than 20 feet above the water level in the weU. To practically eliminate suction Hft the cyhnder may be submerged as shown in figure 19, thus making the cyhnder and pump frame separate and connected only by a sec- tion of pipe. This pre- vents the valves from dry- ing out and makes the pump self-priming. Force pumps often have two cyhnders, and in deep wells it is necessary that the lower or suction cyl- inder be either submerged or within at least 15 feet of the water level. In. Fig. 19.—Force pump with cylinder suljmerged in shallow well. the figure shown the forcing cyhnder is within the suction cyhnder. The suction of any type of pump must be au' Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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