Method and apparatus for porting lateral connections in lined pipelines

摘要

A method and apparatus for porting lateral connections in a lined pipeline from the lateral side of the liner. An access hole is formed through the liner material covering the lateral connection. A cutting apparatus, such as a water cutter, is inserted through the access hole with the nozzle directed back towards the liner. Alternatively, the cutting apparatus can be fed through the lateral towards the lined opening. The inside surface of the lateral pipe is then used as a guide to aim the water jet at the precise location where the cut is desired as the nozzle is revolved around the inside surface of the lateral to cut the liner to the shape of the connection opening.