What is Cleaning and Lining? Why is it being done in my neighborhood?
Cleaning and Lining is a process of applying cement-mortar lining to the pipe wall of water mains. This process is used to rehabilitate mains that have scale, corrosion and iron and manganese build up. The build up can cause discolored water and pressure/flow problems in an area. Neighborhoods are selected for Cleaning and Lining based on: • Fire flow tests. • Discolored water complaints and problems. • Street resurfacing projects – if the main is more than 30 years old. The Cleaning and Lining process is performed on mains in place and involves: • Installing bypass lines (above ground) to provide temporary water service to customers during the rehabilitation process. • Accessing the pipeline through small excavations. An approximate 6′ section of pipe is removed to provide access to the interior of the pipeline. (A new piece of lined pipe is installed when the main is put back in service.) • Removing the buildup of iron and manganese from the pipe by steel scraper blades drawn through
