_The triplex power gang pump_ is shown in Fig. 211. The engraving represents two triplex pumps bolted to one bed, and having an extended pulley shaft with pinions near each end to drive all of the pumps. [Illustration: FIG. 211.] TABLE. ===========+========+========+========+========+======== No. | 1 | 2 | 3 | 4 | 5 -----------+--------+--------+--------+--------+-------- Size of | | | | | Plunger | 2-1/4 | 3 | 4-1/2 | 6 | 8 in inches | | | | | -----------+--------+--------+--------+--------+-------- Length of | | | | | Stroke | 2-3/4 | 3-1/4 | 4-3/4 | 6-1/2 | 8-1/2 in Inches | | | | | -----------+--------+--------+--------+--------+-------- Gallons | | | | | per Stroke | .28 | .58 | 1.96 | 4·76 | 11.08 or 1 Rev. | | | | | -----------+--------+--------+--------+--------+-------- Revolutions| | | | | per |20 to 50|10 to 40|10 to 40|10 to 30|10 to 25 Minute | | | | | -----------+--------+--------+--------+--------+-------- Size of | | | | | Suction | 1-1/4 | 1-1/2 | 2-1/2 | 4 | 5 in Inches | | | | | -----------+--------+--------+--------+--------+-------- Size of | | | | | Discharge | 1-1/4 | 1-1/2 | 2 | 3-1/2 | 4 in Inches | | | | | -----------+--------+--------+--------+--------+-------- Size of | ACCORDING TO DUTY REQUIRED Pulleys | -----------+--------+--------+--------+--------+-------- Geared | { *16 }| { *16 }| { *13 }| { *20 }| { *20 } | { 72# }| { 80# }| { 71# }| { 89# }| { 80# } -----------+--------+--------+--------+--------+-------- Pressure | 175 | 175 | 170 | 165 | 160 Pounds | | | | | -----------+--------+--------+--------+--------+-------- * Teeth in Pinion. # Teeth in Spur Gear. The description of the duplex power pump just given, applies to this type also. The exception is that _the triplex has three plungers and barrels_ instead of two. There are two spur wheels and two pinions on each pump to equalize the power to better advantage, as by this arrangement one eccentric is placed between each pair of spur wheels and two eccentrics outside. The pinion shaft is in one piece having tight and loose pulleys. [Illustration: FIG. 212.]