Increased sump capacity - a model study.

Increasing pump sump capacity by mere addition of more pumps is limited by generation of voritices. In most cases costs for changing sump dimensions to increase capacity are prohibitive. In a sump model for which three pumps would satisfy the Hydraulic Institute Standards, three arrangements were tested with five pumps to determine their acceptance for the increased load. These arrangements were the echelon, the inverted 'Vee' and the upright 'Vee' as shown in the paper. At this 67 percent higher pumping rate, the echelon and the inverted 'Vee' arrangements were found acceptable. Besides increasing the capacity of existing sumps, adoption of these arrangements could yield substantial space savings in new pumping pits. (A)