| 摘要 |
An existing pipeline (1) is relined by introducing an inner tube (2) of thermoplastic material, particularly of polyethylene terephthalate, and enlarging thereafter its diameter until the inner tube (2) tightly engages the inner wall of the pipeline (1). During the introduction of the inner tube (2) the ratio of the external diameter of the inner tube (2) to the internal diameter of the pipeline is less than 0.6. This method is particularly suitable for relining existing pipelines compressing in their wall substances which can be released into a medium transported through such a pipeline, e.g. a pipeline of lead for drinking water transport. An installation for introducing an inner tube (2) into a pipeline (1) comprises a coupling piece (3) having an inlet (16) for a pressurized fluid and a vent opening (7), and a bush (14) for fixing the inner tube (2). |
