======+=======================+=======+=========+===============+ | | | | Gallons per | | Dimensions | Size | Size| Minute | |-------+-------+-------| of | of| required | | | | |Drive- | Delivery| to operate | Number| Height| Length| Width | pipe | -pipe | Engine | ------+-------+-------+-------+-------+---------+---------------+ 10 | 2' 1" | 3' 2"| 1' 8"| 1-1/4"| 3/4" | 2-1/2 to 6| 15 | 2' 1" | 3' 4"| 1' 8"| 1-1/2"| 3/4" | 6 to 12| 20 | 2' 3" | 3' 8"| 1' 9"| 2" | 1" | 8 to 18| 25 | 2' 3" | 3' 9"| 1' 9"| 2-1/2"| 1" | 11 to 24| 30 | 2' 7" | 3' 10"| 1' 10"| 3" | 1-1/4" | 15 to 35| 40 | 3' 3" | 4' 4"| 2' 0"| 4" | 2" | 30 to 75| 80 | 7' 4" | 8' 4"| 2' 8"| 8" | 4" |150 to 350| 120 | 8' 9" | 8' 4"| 2' 8"| 12" | 5" |375 to 700| 120 | 8' 9" | 8' 4"| 2' 8"| 2-12" | 6" |750 to 1400| ======+=======+=======+=======+=======+=========+================+ =======+===========+========+========+======= |Least Feet | |Price |Price | of Fall | |Single- |Double- Number |Recommended| Weight |acting |acting -------+-----------+--------+--------+------- 10 | 3 | 150 | $ 50 | $ 65 15 | 3 | 175 | 55 | 70 20 | 2 | 225 | 60 | 75 25 | 2 | 250 | 66 | 81 30 | 2 | 275 | 75 | 90 40 | 2 | 600 | 150 | 170 80 | 2 | 2200 | 525 | 575 120 | 2 | 3000 | 750 | 850 120 | 2 | 6000 | 1500 | 1700 =======+===========+========+========+======= If the length of the discharge pipe is more than a hundred feet, the effect of friction is to reduce the amount of water pumped, but rams will operate successfully against a head of three or four hundred feet. The writer remembers an installation in the northern part of New York State, where two large hydraulic rams furnish the water-supply supply for an entire village, pumping every day several hundred thousand gallons. Figure 44 shows an installation by the Power Specialty Co. of New York, using the fall of some rapids in a brook to pump water into a tank in the attic of a house. [Illustration: FIG. 45.--Means of securing fall for hydraulic ram.] In Fig. 45 are shown two methods of securing a fall for hydraulic rams, recommended by the Niagara Hydraulic Engine Co. The first method shows no drain pipe, but a long drive pipe; while the second method puts the ram in an intermediate position, with considerable lengths of each.