Herewith are dimensioned drawings of a centrifugal pump designed to lift 150 gal. per minute at 20 ft. head. To enable the volute to be correctly formed the case is in two halves. To avoid end thrust and to ensure an even balance of the disc, the inflow takes place on each side, each inlet having a diameter of 3 in. Fig. 1 is a side elevation and Fig. 2 one half of the case showing the depth of the volute and disc with angle of vanes. The volute, to obtain a good flow, must increase evenly to its discharge. The discharge pipe should increase in area to reduce the velocity considerably. The flange of the casing is l in. wide, drilled to take 3/8 -in. holts. The diameter of the disc is 9 in., and is arranged for six vanes, having an angle of 80° at the circumference. The shaft is 7/8 in. diameter, and the approximate speed of disc is 650 revolutions per minute. Fig. 3 is a section showing side inlets, disc, and brackets, and Fig. 4 is a section of half of the disc showing dimensions of the vanes.

Centrifugal Pump.