Texas Wastewater Class B Practice Exam

Which pump is most commonly used in a lift station?

1. Diaphragm pump

2. Centrifugal pump

3. Piston pump

4. Submersible pump

The correct answer is: Centrifugal pump

The most commonly used pump in a lift station is the centrifugal pump. This type of pump operates by converting rotational energy, typically from a motor, into energy in the fluid being pumped. Its design allows for a smooth and continuous flow of wastewater, making it highly effective for the applications commonly found in lift stations. Centrifugal pumps are preferred in these settings due to their efficiency and ability to handle large volumes of fluid with relatively low energy consumption. They can also manage various types of liquids, including those that contain some solids, which is often the case in wastewater systems. Other pump types, such as diaphragm and piston pumps, might be used in more specialized situations but are not as suitable for the continuous flow requirements typical of lift stations. Submersible pumps do have their place in lift stations as well, particularly when the pump needs to be submerged in the wastewater. However, centrifugal pumps remain the most prevalent choice due to their overall performance and reliability in the majority of lift station designs.