Wastewater Treatment Facility Plant
Replacement of Plant Water Systems
Oyster Bay, NY
H2M was retained by the Oyster Bay Sewer District to design the replacement of their wastewater treatment facility plant water system. The existing pumps were in service for over 20 years and had reached the end of their useful service life.
The plant water system utilizes chlorinated effluent for tank washdown, flushing water, and other non-potable uses. The existing pumps were in service for over 20 years and had reached the end of their useful service life. The control system was obsolete.
The triplex water booster system was located under a stairway in the basement of the Control Building. The system had a capacity of 200 gallons per minute (gpm) at 65 psi. The lead pump had a 5 HP motor and the other two pumps had a 7.5 HP motor. Supply capacity of the existing pumping system exceeded the current needs at the treatment facility. H2M evaluated usage and selected a new pumping system that would reduce energy costs.
For a flow capacity of 175 gpm at 65 psi, the new system was designed to utilize multi-stage centrifugal pumps with variable frequency drives. A 3 HP motor was utilized on the lead pump and the other two pumps had a 5 HP motor.
To minimize the time to transition between the existing and proposed new system, the new system was designed to be installed adjacent to the existing system. The new system location eliminated the need for District’s personnel to step over the suction piping to access a clothes dryer.
During construction, H2M provided construction administration, reviewed shop drawings, and reviewed contractor payment requests and periodic construction observation.
