LocationWhite Plains, Charles County, Maryland
MarketPump Stations
PUMP STATION REHABILITATION, WET WELL RESTORATION, SUBMERSIBLE PUMPS, PROCESS MECHANICAL PIPING, BYPASS PUMPING AND SITE IMPROVEMENTS.
Johnston Construction Company
- Completed a comprehensive rehabilitation of the existing White Plains Commerce Center wastewater pumping station, modernizing a facility originally constructed in the mid-1980s. The existing station incorporated a wet well approximately 24 feet deep, requiring careful planning for demolition, cleaning, equipment replacement, process-mechanical work and final connections within an operating wastewater facility.
- Cleaned and rehabilitated the existing wet well interior and installed a high-performance protective coating system specifically suited for wastewater immersion and splash-zone exposure. Existing concrete surfaces required abrasive blast cleaning followed by pressure washing at approximately 3,000 to 4,000 psi, drying and application of the specified epoxy coating system.
- Installed a new duplex submersible non-clog wastewater pumping system designed for approximately 100 GPM at 32 feet of total head. The specified pumps incorporated a minimum 3-inch solids passage, motors not exceeding 3 HP, monitoring for motor temperature and leakage, and lift-out components designed to facilitate inspection and maintenance.
- Constructed a new above-ground valve enclosure and associated wastewater process-mechanical system, incorporating new process piping, check valves, resilient-seated isolation gate valves, air/vacuum valve components and the appurtenances necessary to provide a complete operable pumping-station discharge system.
- Provided a permanent emergency bypass connection to the force-main system together with maintenance provisions for the new pumping equipment. The station improvements incorporated a 4-inch bypass connection and a removable stainless-steel hoist system with a 2,000-pound-capacity hand-operated winch for future removal and servicing of the submersible pumps.
B & R Electrical Contractors
- Performed the subcontracted electrical construction package for the White Plains Commerce Center Pump Station Upgrade, furnishing the labor, materials, tools and equipment required for the electrical work associated with the wastewater pumping-station improvements in accordance with Electrical Drawing E-1, Specification Section 16000 and project Addendum No. 1.
- Installed new conduit, conductors and electrical connections throughout the upgraded pumping-station systems, including raceways installed in accordance with the project's power one-line diagram and electrical details.
- Provided electrical raceway systems specifically suited to the different operating environments within the facility. Underground electrical installations utilized PVC conduit, while exposed wet-well installations utilized rigid metal conduit with stainless-steel support materials and explosion-proof provisions where required.
- Modified the existing electrical distribution equipment to support the upgraded pumping system, including replacement of an existing 80-amp, 240-volt, three-pole circuit breaker with a new 35-amp, 240-volt, three-pole breaker.
- Added new branch-circuit protection within the existing electrical panel, including a 20-amp, three-pole, 240-volt circuit breaker and a 20-amp, single-pole, 120-volt circuit breaker for the upgraded station equipment.