Written by Joshua DiValentino, August 27, 2015
The City of Stockton wastewater treatment facility has seen its fair share of challenges in recent years. When financial resources were limited, the burden fell upon the operations/maintenance staff and the existing equipment to continue operations with aging infrastructure. At this point, the piston pumps supplied by Schwing Bioset, Inc. (SBI), located in the sludge dewatering building, had been in operation for over 20 years.
The pair of KSP 25 pumps moved dewatered sludge cake from the dewatering building out to the truck loading building, several hundred feet away. The two systems were the only means of transporting dewatered sludge cake for the 30 MGD facility. Regardless of the operational circumstances, with a resourceful operations/maintenance staff and the help of SBI technical support, the pumps remained in service with over 129,900 hours on the meter.
By 2014-15 the pair of KSP 25’s had been in operation since early 90’s, and were now nearly 25 years old. The City of Stockton facility was now emerging from a turnaround and making critical investment upgrades. Stockton once again chose to invest in Schwing Bioset Piston Pumps and replace the aged pumps with brand new KSP 25’s in the dewatering building. The new pumps have the same durability to last another thirty years, and with upgraded safety and control features that offer easier remote operation and even longer wear part life.
The SBI field services team was also hired to remove the exiting units and re-install the new pumps. The pump system was replaced by SBI in full including; Hydraulic Power Packs, Twin Screw Feeders, Control Systems, and of course the Piston Pumps. The SBI crew was able to work seamlessly with Stockton personnel to not upset active onsite operations during installation. As such, the pumps were replaced in series to phase out the old system. A completely brand new turn-key cake pumping system will be turned over to the City of Stockton this year.