CWEA Collections System Maintenance (CSM) Grade 3 Certification Practice Test

The placement of a check valve for a lift station pump is critical for ensuring proper pump operation and preventing backflow. Installing it between the discharge isolation valve and the discharge port of the pump serves several important functions.

First, it allows the check valve to prevent the backflow of wastewater into the pump once it has been discharged, which helps maintain system efficiency and reduces the risk of damage to the pump. By positioning the check valve directly after the pump, it can effectively stop any reverse flow that might occur when the pump is off or during pressure fluctuations in the system.

Furthermore, this arrangement ensures that the check valve is protected by the discharge isolation valve, allowing for safe maintenance of the valve itself without interrupting the operation of the entire system. This not only supports operational integrity but also simplifies troubleshooting and repairs, as technicians can isolate the valve from the system easily.

In summary, this configuration optimally positions the check valve to fulfill its role in preventing backflow, while also allowing for proper maintenance and operational efficiency within the lift station.