IMPROVEMENTS RELATING TO THE LINING OF PIPERLINE AND PASSAGEWAYS

摘要

This invention provides that a lining tube (14) for lining pipelines and passageways (16) comprises an outer impermeable coating (12) and an inner layer or layers (10) of resin impregnable felt. The felt is impregnated with the resin (10) prior to the application of the lining tube (14) to the pipeline or passageway (16). The tube (14) is applied by inversion of same and the invention resides in that the inner surface of the felt which forms the outer surface of the tube (14) after eversion, is covered by means of an impermeable film to prevent ingress of air into the felt. The impermeable tube (14) preferably is inside the felt in the form of a rope and held in rope form by devices which yield as the impermeable tube (14) opens up during eversion. The invention also provides a method of making the lining tube (14) and a lining tube (14) per se.