Hole boring guide for attaching pipe branches - has plastic body with radial union and is welded to current pipe by heater mat with conductor wire arrangement with wire-free central zone

摘要

A hole boring guide for plastic pipes consists of a split ring with a radially branching tubular union. On the inner wall of the ring is an electrically conducting mat with parallel aligned wires which are connected to each other at the mat ends by 180 deg. loops. A central area of the mat under the tubular union remains free of conductive wires if the wires along the mat edges run parallel from one end of the mat to the other and those between the edge wires run parallel from the central, wire free area to each end of the mat. USE/ADVANTAGE - The boring guide is used to attach branch or by-pass pipes to an already existing pipeline and the conducting wire arrangement avoids problems of contact with the drill which originally pulled wires from the welding point.