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In our last entry on Lift Station Maintenance, we discussed the need for routine testing of redundant control systems; we also covered the ways that the Lift Station Guardian (LSG) automatically audits the condition of the floats and notifies operators when preventative maintenance is needed. Now that we’re starting to catch problems before they occur, the next question is how do we mitigate the impact of failure modes and reduce the costs of operating a lift station?
Citico Pump Station is the largest custom-built wastewater station in the Chattanooga system. It was designed to handle 120 MGD, and to respond quickly to infiltration events typical of Combined Sewer Overflow (CSO) facilities.
The station was scheduled to undergo major refurbishment in 2024 which would include replacement of all pumps, VFDs, switchgear and controls. Prior to the refurbishment, the City engaged Specific Energy to provide a comprehensive analysis of the current pump sizing, force main hydraulics and control strategies to determine if changes should be made.
Lift stations have exactly one job: keep the water moving. It's so simple, and yet failure is not easily tolerated with this job. For example, how can on be sure, that the backup floats in the wet well are going to work when they are called upon to do so? Ideally, the lift station would be able to recognize that a float has failed before it is required to work.
