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THE DROPLET: Line of Defence
Pipe lining is quickly becoming a cheaper alternative for protecting drinking water from corrosive material and contamination - so what are the benefits?
Written by Rachel Phan

When the Town of Rothesay, New Brunswick began to receive complaints about dirty water, it was discovered that the source of the problem was a section of cast iron watermains constructed in the 1960s. Rather than digging up and replacing the pipes, the Town opted to explore other cheaper and less disruptive options. Pipe lining—a relatively new technology in North America—was chosen as the most convenient solution.

Liners are primarily used to solve the problem of municipal water pipe deterioration. When pipes are corroded over time, pipe liners are applied to the inside of unlined cast iron or cement mortar-lined pipes. While older structural spray lining, often called Cured-In-Place-Pipe, is slow setting and requires a minimum 16 hour cure period and an additional 36 hours of service shutdowns, the new generation polyurea pipe linings are rapid-setting and quick cure.

“Generally speaking, pipe liners have been specifically developed for the rehabilitation of potable water pipe infrastructure to help extend service life, reduce leaks, and improve water quality by preventing tuberculation—the build-up of corrosive material on the inside of iron piping—that can lead to colour, taste, and odour issues,” says Sylvain Masse, the business development manager of the 3M Infrastructure Protection Division.

“Essentially, liners reduce the contact water has with piping, which in turn reduces the likelihood of water discolouration and poor pressure,” 
he adds.

Aside from acting as a thin layer of protection, liners can also be applied as a structural addition to the pipe, which means the layer of liner can act as a pipe in the event that the actual pipe fails due to age or corrosion. As a result, pipe liners can prevent contaminants from reaching water in cases where the earth surrounding a corroding pip
 
Xylem Water Solutions   Hydrotech


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February 18, 2014

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