THE IRRIGATION AGE. 



171 



type of engine was selected on account of the small 

 amount of floor space required; the low steam consump- 

 tion, and the possibility of continuous operation with 

 the minimum amount of attention. It is equipped with 

 a belt pulley 60x12% inches, the speed being 260 revo- 

 lutions per minute. At this speed it will give 105 H. P. 

 with 90 pounds steam pressure, and 117 H. P. with 100 

 pounds steam pressure. As the pump requires only 90 

 H. P., it is evident that the engine will operate well 

 within its power with 90 pounds of steam. A 12-inch 

 double leather belt is used to transmit the power to the 

 pump. 



successful that no boiler troubles have been experienced 

 in two years of pumping. 



STEAM AND EXHAUST PIPES. 



By carefully noting the vertical section and plan 

 the methods used to compensate these pipes against ex- 

 pansion and contraction will be seen, and the general 

 design of the plant comprehended. 



COSTS OF PUMPING. 



During 1908 the acreage irrigated was about 500 

 acres, 350 acres being planted to trees. 75 acres to 



Crots 5ecfi'on of Engine 4 Pumpinfl RoomJ. 

 Plan of Elgin, Utah, Plant. 



BOILERS. 



Two standard horizontal tubular boilers are used, 

 each being 66 inches diameter and 16 feet in length, 

 and rated at 100 H. P. A separate stack is used for 

 each. Since bricks were scarce and high in price, the 

 boilers were set in reinforced concrete, compensation 

 for expansion being made in the design. This setting 

 shows no signs of deterioration after two years' use. 

 The boilers were designed for burning coal, but during 

 1908 wood was used very successfully, and no difficulty 

 was experienced in operating the plant with one boiler. 



AUXILIARIES. 



Feed water is supplied to the boilers by a duplex 

 boiler feed pump, piston packed, size 5^x31/^x5, ca- 

 pacity 40 gallons per minute. 



In order that all mud might be settled out of the 

 feed water before it is used, two wood tanks are used, 

 12 feet in diameter and 12 feet high, each being of 

 ample capacity to contain sufficient water for feeding 

 the boilers for 24 hours. The water, therefore, has 24 

 hours in which to settle before passing to the feed 

 water heater and filter. Each tank is equipped with a 

 system of flushing valves, by means of which all mud 

 that accumulates may be flushed out before the tank is 

 refilled by the centrifugal pump. 



For heating the feed water before it passes to the 

 feed pump, a Stilwell combined heater and filter of the 

 open type is used. This filters the water first, and 

 then permits it to pass in thin sheets over a series of 

 pans, the exhaust steam from the engine being here 

 brought into contact with it. Any mineral matter that 

 is suspended in the water is here precipitated and col- 

 lected, the pans being readily removed and cleaned. This 

 combined system of purifying the water has proven so 



cantaloupe, and about 75 acres to other crops. The 

 pump was started on April llth and ran until Sept. 

 16th, operating from 10 to 12 hours per day for 6 

 days per week. It ran for 140 days, or about 1,540 

 hours. The speed of the pump was kept down until it 

 discharged about 7 second-feet, and the quantity of 

 water pumped during this time was about 850 acre- 

 feet, giving about 1.7 acre-feet per acre of land under 

 cultivation. The secretary of the company writes that 

 the plant, although designed for 1,000 acres, could sup- 



Pumping Plant of Elgin Power and Water Co., Elgin, Utah. 



