Process and apparatus for in situ rehabilitation of pipelines

Plastic and nonmetallic article shaping or treating: processes – Forming structural installations in situ – Repositioning or moving mold to form sequential portions of...

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118DIG10, 138145, 264 35, 264514, 264564, 264573, 2642092, 2642093, 425 13, 4253261, 425380, B29C 4706, B29C 6334

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active

051045958

ABSTRACT:
Underground pipelines that carry wastewater water, natural gas and industrial fluids deteriorate with age. Shown is a process and apparatus for installing a thermoplastic liner in such existing pipelines to accomplish in situ rehabilitation. It involves extruding a tube of thermoplastic liner material within the interior of a pipeline in situ, said tube having an outside diameter smaller than the inside diameter of said pipeline. The tube is next expanded so that the outside diameter of said tube is essentially equal to the inside diameter of said pipeline. The expanded tube is then cooled and hardened in a liner configuration.

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Hunter, R. M. and Stephens, J. E., System for In Situ Pipeline Rehabilitation, Jul. 1990, pp. 9-13.

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