Method and apparatus for fitting an inner tube in an existing pipeline while continuously supplying heat, and a pipeline obtained in this way

摘要

Lining of a pipeline (1) by stretching therein a plastic inner tube (2) by means of a recirculating medium maintained at stretching temperature. An apparatus for stretching the inner tube (2) comprises pressure raising means (14) for a conveyed medium, medium heating means (3) for maintaining the medium continuously at stretching temperature, and a recirculation pipe (9, 22, 23, 24).