When Fishbeck, Thompson, Carr & Huber, Inc. was selecting an enclosure for a water filtration plant they wanted to make sure that they picked a quality product that could withstand extremely corrosive conditions that most of the previous metallic enclosures could not. Find out why they chose Stahlin Non-Metallic Enclosures for their application in Stahlin’s Water/Wastewater Application Case Study.
Fishbeck, Thompson, Carr & Huber, Inc. (FTC&H) is a professional civil engineering, environmental consulting, architectural/engineering, and construction management firm. They specialize in the design of water and wastewater treatment plants for municipalities and industry. One of their clients, a water filtration plant, located in Western Michigan was concerned about the early corrosion of metallic enclosures that housed critical SCADA PLC Control Panels. The corrosion level is unusually high in this environment due to the control units placed above an open top tank containing chlorinated water, which is a necessary, yet problematic location to place controls.
Although commonly found in disinfectants and bleach, chlorine is a well-known and vital chemical utilized in the process of water purification. Chlorine is also used in the form of hypochlorous acid, which kills bacteria and other microbes in drinking water supplies and public swimming pools. However, along with the benefits of using chlorine, there are side effects. For instance, a team of researchers in Wisconsin sponsored by the Midwest Technical Assistance studied, chlorine’s effect on corrosion of drinking water systems. Their research found introducing free disinfection increased corrosion. Specifically, chlorine creates an overall breakdown of the passive film that coats stainless steel thought to protect the metal from chemical attack. This results in the entire surface of the metal developing a uniform “spongelike” appearance. The rate of attack can be affected by the fluid concentration, temperature, fluid velocity and stress on the metal components exposed to the chlorine. As a general rule, the rate of attack will double with a temperature increase of 18° Fahrenheit (10° C.) in either…>>Read More