NJDWSC Backwash Water Tank Upgrade
The North Jersey District Water Supply Commission (NJDWSC) had to take their filter backwash water tank out of service to be refurbished. Filter backwashes are performed many times a day so pumps would have to be installed to provide filter backwash water while the tank was out of service.
Sulzer/ABS XFP 501U-SK3 pumps were selected to provide backwash water with a design point of 12,000 GPM @ 32 feet TDH. The close-coupled pumps have a hydraulic efficiency of 81 percent, a wire to water efficiency of 76%, and the 139HP motors are kept cool by closed-loop cooling jackets. The horizontal installation best utilized the available space and minimized the piping required to connect to the existing discharge header.