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Fiberglass Wetwells

Our Riley and Company Fiberglass Wetwells Brochure offers information about Lift Station Fiber glass details. Click below to download the PDF version of this brochure.

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GUARD PRO II Spec

Our Riley and Company Brochure offers the latest in product details. Click below to download the PDF version of this brochure.

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Design Application

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Lift Stations contain pumps, valves, and electrical equipment necessary to pump water or wastewater from a low elevation to a high elevation. For example, a sewage lift station is used to pump sewage or wastewater up from a low-lying neighborhood to a collection system of pipes. Lift stations are also used in a variety of industrial settings, including mining and water management and treatment. Wastewater systems typically use gravity to transport waste from homes and businesses to provide water treatment at a central facility. For cities that have many changes in elevation, municipalities must use lift stations to pump the wastewater to a higher elevation.

Lift stations are designed to handle a specific flow of water from rainfall, and many contain multiple pumps to manage a large drainage capacity, usually measured in gallons per minute. A sewer lift station is frequently used by municipalities to control the sewage treatment across several areas or neighborhoods. A sewer lift station pumps the effluent to a collection area, ensuring that waste from lower elevation areas is processed.Lift stations for wastewater or storm water applications work in a similar way.

A wastewater lift station typically comprises a concrete or a fiberglass wetwell that is fitted with several submersible pumps. Lift station design also include incorporating level-sensing probes, valves and pressure sensors, and may also include a stand-by generator. Large storm water treatment facilities may have generator back-up for a pump station to ensure the proper drainage of water during a storm or power outage. Lift stations must function in harsh and corrosive environments and are typically made of precast concrete or fiberglass with the pumps and valves accessible through a hatch for cleaning and maintenance.

Float switches are most commonly used in tanks or basins with three floats connected to a junction box which is, in turn, connected to a control panel. The diagram below shows a typical multiple float switch system design. These three floats control the levels in the tank by turning “on” or “off” as the fluid levels rise and fall. The bottom pump off float latches the holding relay on water rise, the pump on float then rises and runs pump until the bottom float drops out releasing the holding relay. These floats work well with low voltage, intrinsically safe circuits. They are used in many different applications wherever fluid levels need to be monitored including sump pump basins, sewage basins, cisterns, septic tanks, chemical solution tanks and more. Float switches replace air bubbler systems, transducers, diaphragm switches, ultrasonic and electrode systems. All can be used in residential, commercial, industrial, agricultural and municipal applications.

No. While Riley & Company does have a variety of pumps for wastewater needs, we do not carry any type of well pump.

Control panels are engineered for the particular installation. The heart of the control system for submersibles is the liquid level control, which activates and deactivates the pump(s) at specified levels within the wet-well.

The simplest control system would contain an on-off magnetic contactor and disconnect.

Systems normally have three sets of controls:

  • turn-off of the first pump
  • turn-on of the pump
  • high liquid alarm

Twin systems usually alternate pumps on each successive cycle. Twin systems also usually include an override control, which brings in the second pump when in-flow is unusually heavy or in case of failure of the first pump.

Control panels are installed above ground and usually contain:

  • pump disconnects
  • across-the-line starters with overload protection
  • hand-off-automatic selectors
  • elapsed time meters
  • alarm systems for indicating high level conditions in the wet-well

In addition, twin systems provide for automatic sequencing and alternating of pumps.

Alternation allows for equal run-time and wear of the pumps. Alarm systems vary but can be visual, audible or remote monitoring by telemetry devices or telephone lines.

The manufacturer will help determine what controls are needed for a particular application, and then design the control panel to this specification.

A check valve, clack valve, or non-return valve is a mechanical device, a valve, which normally allows fluid (liquid or gas) to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, many check valves are very small, simple, and/or cheap. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.

An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.

Plug valves are valves with cylindrical or conically-tapered “plugs” which can be rotated inside the valve body to control flow through the valve. The plugs in plug valves have one or more hollow passageways going sideways through the plug, so that fluid can flow through the plug when the valve is open. Plug valves are simple and often economical.

When the plug is conically-tapered, the stem/handle is typically attached to the larger diameter end of the plug. Plug valves usually do not have bonnets but often have the end of the plug with the handle exposed or mostly exposed to the outside. In cases like that, there is usually not much of a stem. The stem and handle often come in one piece, often a simple, approximately L-shaped handle attached to the end of the plug. The other end of the plug is often exposed to the outside of the valve too, but with a mechanism which retains the plug in the body.

The simplest and most common general type of plug valve is a 2-port valve, which has two positions, open to allow flow, and shut (closed) to stop flow. Ports are openings in the valve body through which fluid can enter or leave. The plug in this kind of valve has one passageway going through it. The ports are typically at opposite ends of the body; therefore, the plug is rotated a fourth of a full turn to change from open to shut positions. This makes this kind of plug valve a quarter-turn valve. There is often a mechanism limiting motion of the handle to a quarter turn.

A sewer is an artificial conduit (or pipe) or system of conduits used to carry and remove sewage and to provide drainage. Sewers are usually pipelines that begin with connecting pipes from buildings to one or more levels of larger underground horizontal mains, which terminate at sewage treatment facilities. Vertical pipes, called manholes, connect the mains to the surface. Sewers are generally gravity powered, though pumps may be used if necessary.

Two classes of submersibles exist:

  • Smaller submersible pumps, used in domestic and light commercial applications, normally handle up to 55mm spherical solids and range from 0.75kW to 2.2kW.
  • Larger submersible pumps, handle 65mm and larger solids and normally have a minimum of 80mm discharge. They are generally used in municipal and industrial applications for pumping sewage and all types of industrial wastewater.

Submersible pumps are normally used in a packaged pump station where drainage by gravity is not possible.

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