Patent ID: 6979025
Filing Date: 2005-12-27
Classification: B29C,F16L

Abstract:
1. A method for joining plastic lined metal pipeline sections to form a plastic lined metal pipeline for carrying high pressure fluids and slurries, the method comprising: lining a metal pipeline section that has a metal flange at one end with a plastic liner such that some of the liner extends beyond the flange end of the pipeline section; electrofusion joining an annular plastic member onto the outside of the portion of plastic liner which extends beyond the flange end of the metal pipeline section; if the liner extends beyond the annular plastic member, trimming the liner to be substantially flush with the annular plastic member, performing the above steps on another pipeline section that has a metal flange at one end; positioning the plastic members of both lined pipeline sections substantially adjacent to each other and substantially in axial alignment with each other; securing a containment ring around both annular plastic members to restrain any outward movement of the plastic members when in use; and securing the annular metal flanges to each other such that the annular plastic members are compressed between the metal flanges.