Lining of pipelines using a continuous tubular pull-through plastic liner

摘要

A tubular plastic liner having a coefficient of thermal expansion greater than the coefficient of thermal expansion of a pipeline is cooled to reduce its outside diameter below the inside diameter of the pipeline, which is also cooled, and is then pulled into the pipeline. After the pulling operation is completed the liner and pipeline are allowed to return to normal temperature, whereupon the liner expands to conform to the inside diameter of the pipeline.