| 20100102038 | EXTERNAL CORROSION PROTECTION FOR UNDERGROUND PIPES - A method for establishing or restoring electrical continuity between metal pipe sections in pipeline rehabilitation according to embodiments of the present invention includes, from an inside of a pipe having first and second pipe sections, removing a layer of the first pipe section at a first location, removing a layer of the second pipe section at a second location, electrically connecting a spanner at the first location and the second location, deploying a tubular liner along the inside of the pipe, injecting grout between the tubular liner and the inside of the pipe, and distributing the grout between the tubular liner and the inside of the pipe, wherein a first radial distance from the inside of the pipe to the innermost extent of the spanner is less than or equal to a second radial distance from the inside of the pipe to the tubular liner. | 04-29-2010 |
