Patent ID: 7418979
Filing Date: 2008-09-02
Classification: F16L

Abstract:
1. An insulated piping system for conveying high temperature fluids, comprising: a first and second length of insulated and jacketed pipe, each having a joining end to be joined to an end of the other length, each pipe length comprising an inner carrier pipe having an interior surface and an exterior surface, an envelope of foamed insulation surrounding the inner pipe exterior surface, and an outer protective jacket surrounding the envelope of insulation, the joining ends of adjacent pipe lengths being welded together to form fixed joints, whereby the adjacent pipe lengths provide a continuous length of fluid conduit for conveying high temperature fluids; a discrete length of an external slip wrap located at a selected location along the length of the piping system at which location the piping encounters an angular shaped change in direction, the slip wrap comprising a loosely received outer sleeve for the piping which surrounds the outer protective jacket without being bonded thereto, whereby the insulated and jacketed pipe can move axially relative to the slip wrap for a selected distance once the pipe is buried in the ground, the location of the external slip wrap along the length of piping being selected in order to prevent disbondment of the foam insulation from the inner carrier pipe.