ParkUSA’s PumpTrooper®, a submersible pump lift station, is a reliable and cost-effective solution to prevent flooding by receiving and moving stormwater and/or sanitary wastewater to designated locations. Generally, a lift station is used to temporally transfer liquid that cannot flow by gravity on its own. This centrifugal pump system is powered by a close-coupled electric motor. The pumps operate quietly and are cooled by the moving liquid to maximize their lifespan.
Most pump stations are designed for multiple pump installations. The duplex system is the most common where the two pumps alternate in operation to equalize the wear of the pumps and to keep the wet well from solids build-up. The multiple pump system offers continued operation in the case of a pump failure, removal for servicing, and also provides extra capacity in times of extraordinary loading.
- A market leader in packaged grinder pump systems
- 2 HP through 15 HP grinder pumps with lifts to 260 feet and flows to 190 GPM
- Offered as complete turnkey systems or engineered to project specifications
- Computer system design and selection programs available for design assistance
- Explosion-proof construction available
Most pump stations are designed for duplex, triplex, or quadruplex pump installations. Although PumpTroopers can contain any number of pumps and pump sizes, the most common pump-motor unit is the duplex system. In this system, two pumps alternate in operation to equalize the wear of the pumps and to prevent the buildup of solids in the wet well. ParkUSA’s multiple pump system offers continued operation in the case of a pump failure, removal for servicing, and an extended capacity in times of extraordinary loading.
The types of submersible pumps available are outlined below:
The ParkUSA PumpTrooper includes the following components:
Described above, under pump models.
Wet Well Basin with Access Cover:
The wet well structure for a submersible pump system is generally located below grade. Precast concrete construction is recommended for buried wet wells that require strength and corrosion resistance. Fiberglass wet wells are suggested for above ground applications, basements, or parking garages. Wet wells range from 4′ to 12′ in diameter, with depths up to 30′. An access hatchway is located at the top of the wet well to permit visual examination of the wet well interior, and for the removal or installation of the pumps. The hatchway is manufactured from coated steel or aluminum, and a locking arm allows the hatchway to be locked in an open position during service. Materials for the hatchway should be specified as rated for either pedestrian or traffic duty for safety and security purposes.
Pump Removal Apparatus (Guide Rail System):
The guide rail system is unique to the submersible pump system. It allows for pump removal, inspection, servicing, and reinsertion of the pump with no need for service personnel to enter the wet well. The rail system consists of stainless steel vertical pipe rails, which extend from the base plate of the wet well to the access cover. During insertion of the pump, the pump is lowered down the rails and fitted to the discharge pipe with a quick-disconnect sealing flange. A chain or cable is attached to each pump and extends up to the access cover. The pumps can be lifted by a portable or permanent hoist for non-confined space removal and replacement.
Pump Removal Apparatus (Guide Rail System):
The PumpTrooper relies on an electrical control system to monitor the liquid level to operate the pumps. The controls include a control panel mounted above ground plus multiple float switches located in the wet well. The control panel should be weatherproof for outdoor usage. The panel contains pump disconnects, starters with overload protection, hands-off automatic selectors, and alarm systems to indicate high liquid level conditions.
Shut off Valves, Check Valves, and Piping:
The submersible lift station has at least one inlet pipe where wastewater enters the wet well. When the liquid level rises to a predetermined level, the pumps are activated. The liquid passes through the pump impeller and is forced through the discharge pipe and into the sewer. A check valve and a gate valve are implemented on each discharge line to prevent backflow, and to allow isolation of each pump for servicing. These valves are usually located in the wet well where the discharge piping is 2″ or less. When the piping is 3″ or larger, an external valve pit assembly may be required.
In order to size a Lift Station unit, three main factors must be considered:
The operation point of the pump must be calculated, this variable is directly related to total dynamic head and volume capacity. There are several charts available to estimate this variable.
Wet Well Sizing:
Once the proper pump has been selected we are able to determine what type and size of wet well is needed. There are two types of wet well that ParkUSA uses for lift stations, round and rectangular. Round wells have the benefit of reduced material costs as well as strength properties. A wet well for a submersible pump is generally located below grade. Buried wet wells require strength and corrosion resistance making precast concrete the primary choice. For wet wells above grade, steel and fiberglass are the recommended material. To summarize when determining the size of the wet well, we must find the minimum storage volume. Flow rate and retention time are basic variables to do this calculation.