ATLANTA PUMP STATION
The Clayton County Water Authority (CCWA) initiated an in-house design for a pump station that included three self-priming pumps and control system, as well as a stand-by power source for emergency power service in the event of line power interruption. The station needed three pumps - two duty and one stand-by - each pump sized to pump 1000 GPM at over 240’ TDH. The pumps needed to be self priming and the manufacturer of the pumps had to also supply the complex triplex control MCC as a system.
Clayton County Water Authority selected a manufacturer that they have been using for many years – the Gorman-Rupp Company. Gorman-Rupp supplied the engineer with the product drawings and specifications to include in the construction documents for the station. The pumps selected were Model VS6 two stage pumps, each stage to be operated with inverter duty rated 75 hp motors. The MCC housed the level controls, system PLC and the VFDs for the system operation.
The project also required a stand-by diesel generator to operate the station when line power was interrupted. The requirements for the generator system supplier included a 350kW generator, generator control panel, automatic transfer switch, fuel tank, fiberglass enclosure with all
necessary ventilation and emergency lighting all be mounted on a common skid and be delivered pre-wired and pre-plumbed to mount on a concrete pad. The manufacturer selected for this system was Precision Systems, another long time supplier of stand-by power generation systems for the CCWA.
Due the high TDH of the station, a wastewater surge control valve was needed to quell any water hammer that may occur during operation of the system. A Ross surge control valve was installed outside the station on the force main to provide hydraulic surge protection for the station.