Coupling sleeve for high-pressure pipe

摘要

A coupling sleeve (4) with thermoplastic outer and inner bushes (6,5) and has resistance wires (7) between them. The bushes have teeth which have a steeply slanting tooth flank (23) and a relatively gently slanting tooth flank (24). When the resistance wires are connected to an electricity source, the heat generated melts the coupling sleeve and those of each pipe joint in order to create a welded joint. The bushes are made up of thermosetting material such as vinyl ester or epoxy resin reinforced by carbon fibers or glass fibers. They have a tensile modules greater than 50 GPa. The pipes each comprises of a fluid tight inner casing of thermoplastic material and a reinforced outer casing (12). The inner casings have to be connected in a watertight joint.