Sewer Bypass Basics: Selecting the Right Pump

Now, the most critical component of a bypass system: the pumps. Often, a single pump is not sufficient to provide the needed capacity, so a bypass operation will require multiple pumps working together. Another reason why multiple pumps are common is that a backup system will ensure that operations can continue even in the event of an unanticipated occurrence, such as unexpected high flows, primary system failure or power loss. In addition, many municipalities require at least one backup pump equivalent to the largest pump in the system.

To determine the most efficient bypass pump, it is important to consider several factors. Among them are static suction lift, wastewater type, sewage level within the pipeline, discharge point and anticipated maximum peak flow. These factors will determine the type and number of pumps that the project requires.

Because bypass work demands a pump that can handle a large volume of liquids with solids in suspension, self-prime at depths of over 20 feet and output for the needed capacity in challenging conditions, the most commonly used pumps are centrifugal self-priming or centrifugal submersible pumps.