Mechanical pipe joint with liners

摘要

Methods for installing liners in metal pipes incorporating the embodiments of this invention are disclosed. Liner (30), pulled through the pipe, is cut back to the correct position in socket (22) and pin (36). Socket clamp (32) or pin clamp (42) is placed over extrusion rod (78) of reverse calibration machine (60). Liner clamp mandrel (76) is installed behind the clamp. First hydraulic cylinder (64) and second hydraulic cylinder (66) in reverse calibrator frame (62) are activated to move extrusion rod (78). The tapered surface of liner clamp mandrel (76) comes in contact with the clamp, expanding the clamp walls as the hard tool steel of the mandrel contacts the softer steel of the clamp. Liner clamp mandrel (76) passes fully through the clamp completing the installation. Liner (30) is locked between socket clamp (32) or pin clamp (42) and the inside wall of the calibrated section of socket (22) or pin (36). The inside wall of socket clamp (32) or pin clamp (42) is positioned to create a continuous and substantially flush surface with the inside wall of liner (30) extending along the inside wall of the pipe outside of the area occupied by socket (22) or pin (36). This alignment of the preferred embodiment of socket (22) and pin (36) is one of the key features of this invention. Although the method of forming a mechanical pipe joint is not an embodiment herein, the preparation of pipe ends with inserted liners for joining by mechanical means is an important embodiment of this invention. The preferred embodiment of pin (36) is shown fully inserted into the preferred embodiment of socket (22). All inside surfaces are positioned to create a continuous and substantially flush surface where the inside wall of socket clamp (32) and pin clamp (42) are flush and do not protrude below the inside wall of liner (30) extending along the inside wall of the pipe, outside of the area occupied by the socket and pin. The alignment of the pin (36) and socket (22) following assembly of the mechanical pipe joint is a key functional benefit provided by the preferred embodiments of this invention.