FREMGANGSMAATE OG ANORDNING FOR UTSKIFTING AV EN ROERSEKSJON

摘要

A method and apparatus for replacing a damaged or defective section of a length of original piping or tubing (26) located within a structure such as the turbine of a jet engine wherein access to the tubing is limited, and replacing such damaged section with a new section of tubing comprises inserting a cutter (10) mounted at one end of a flexible shaft (14) into the interior of the original tubing and rotating the shaft to cut out and remove the damaged section (28) of tubing leaving at least one stub section (32) of original tubing. The stub sections of original tubing (26) are then prepared for welding or brazing to a section of replacement tubing with a series of tools each mounted to an elongated shaft to permit manipulation of such tools onto the cut ends of the stub section of original tubing (26) through an access opening in the structure where the tubing is located. These tools include a chamfering tool for forming a chamfer on both the inner and outer surfaces of the wall of the stub section, a deburring tool for removing burrs and surface irregularities from the outer surface of the stub section and a polishing tool for polishing the outer surfaces. The replacement section of tubing is connected to the stub section of original tubing by inserting a hollow mounting sleeve welded or brazed to the replacement section of tubing over the end of the stub section so that the end edge of the stub section engages a brazing ring carried in the interior of the hollow mounting sleeve against the end edge of the replacement section of tubing. The elongated nozzle of an acetylene torch is then inserted into the replacement section of tubing and heats the brazing ring to form a fluid-tight joint between the replacement section of tubing, the stub section of original tubing and the mounting sleeve.