Is PE pipe resistant to chemicals commonly used for disinfection and water treatment?
PE pipe is generally resistant to the chemicals commonly used for water treatment and disinfection. Disinfection of water mains is a frequent operation. Disinfection takes place when commissioning newly constructed potable water mains; mains that have been removed from service for planned repairs or for maintenance that exposes them to contamination; mains that have undergone emergency repairs due to physical failure; and mains that, under normal operation, continue to show the presence of coliform organisms. The chlorine disinfection process puts pipe in contact with a strong oxidising agent. Several studies have been conducted to verify the effects of chlorine disinfection on the performance of PE pipes. A study by the US Plastic Pipe Institute included pre- and post-exposure testing of several characteristics of PE pipes, including resistance to slow crack growth. The testing performed in this study indicated that chlorine disinfection, when conducted within the guidelines of AWWA-C
