Pure Technologies - a Xylem brand

Wastewater force main management – internal corrosion survey using inline methods


Courtesy of Pure Technologies - a Xylem brand

In our first post about Wastewater Force Main Management, we looked at how preliminary analysis helps operators develop a plan for managing their system. After completing this process, operators can begin putting the plan into action with preliminary surveys on specific force mains.

For those at WEFTEC, you can visit Pure Technologies at Booth #1382 to find out more information on successful force main management.

Leak and gas pocket detection is an important part of wastewater force main management, since the presence of leaks is often a preliminary indication of a potential failure location. Gas pockets in force mains are of particular concern, since the hydrogen sulfide gas within the wastewater may be converted into sulfuric acid by bacteria in the slime layer on the pipe wall. This can cause corrosion and eventual break down of the pipe wall.

The use of inline leak detection is an effective way to identify leaks and gas pockets on force mains. Both leaks and gas pockets create unique acoustic anomalies that can be identified precisely using inline leak detection. The benefit of inline methods in favor of non-intrusive methods is that an inline tool brings the acoustic sensor used to detect the anomaly right to the source, allowing for precise location of these problems.

These surveys are best conducted as a precursor to a structural assessment and provide operators with a baseline condition of the force main.

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