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

RULES FOK CALCULATING PUMPS. Rule 1. To find the capacity of a double-acting pump: square the diameter of the water cylinder and for a single cylinder pump, multiply by 4; for a duplex pump multiply by 8; for a triplex pump multiply by 12 ; and for a quadruplex pump multiply by 16. 1 his gives the discharge in gallons per minute at piston speed of 100 feet. For piston speed other than 100 feet, multiply the result secured as above by the ratio of the given speed to 100. Thus for speed of 80 feet, multiply by .8. Rule 2. To find the diameter of a double-acting pump to discharge the given volume of water: for single cylinder pumps divide the discharge in gallons by 4; for duplex pumps by 8; for triplex by 12; and for quadruplex by 16. Extract the square root of the result so secured, giving the diameter in inches of the water cylinder of the pump which at 100 feet piston speed will deliver the required volume. For piston speed other than 100 feet divide the discharge by the ratio of the given piston speed to 100 and proceed as above. Rule 3. To find the size of a pump to feed a sfiven boiler: multiply the boiler horse power by 6 and divide the result by 100. This gives the required discharge of the pump in gallons per minute, and the size of the pump may then be found by Rule 2. Boiler feed pumps should not run at a piston speed of more than 30 to 50 feet. Note. The results secured by these rules are not exact but are suf- ficiently close for all practical purposes. 94