Patent ID: 6079095
Filing Date: 2000-06-27
Classification: F16L,Y10S,Y10T

Abstract:
A method for forming a flange on the end of a lining for a metallic pipe, comprising:forming a metallic flange having a central bore dimensioned to be fitted to one end of the metallic pipe, the flange having an outer surface and opposed rear surface, the flange formed with an internal annular groove on the outer surface and a plurality of extrusion openings extending longitudinally from the groove to the rear surface of the flange;installing the metallic flange on one end of the metallic pipe with the base of the groove at the end of the metallic pipe;installing a thermoplastic liner in the metallic pipe with the liner extending outwardly from the flange end of the metallic pipe to provide an exposed end of the thermoplastic liner;heating the exposed end of the thermoplastic liner sufficient to render the thermoplastic liner malleable;surrounding the exposed end of the thermoplastic liner with a forming unit having a forming collar with a recess, the forming unit including drive means for applying force to the exposed end of the liner to flow the liner into the annular groove and forcing the excess liner material through the extrusion openings to the rear surface of the flange;applying force sufficient to flow the liner into the annular groove and force excess liner material through the extrusion openings and to provide a portion of the liner extending outwardly from the front surface of the flange with a compressive surface for meeting with a corresponding lined flange steel pipe to be connected therewith.