Patent ID: 7520535
Filing Date: 2009-04-21
Classification: B29C,F16L

Abstract:
1. A method for protecting a pipe joint of a pipeline, comprising: wrapping a cover sheet circumferentially about the pipe joint, the cover sheet having a plurality of chambers formed along an inner surface by a plurality of ridges extending inwardly; forming an annular space between the pipe joint and the wrapped cover sheet with the chambers between the ridges in communication with the annular space; introducing into the annular space a joint filling material in the form of chemicals which are adapted to react and form a high density, open cell polyurethane foam; allowing the chemicals of the joint filling material to react and form a high density, open cell polyurethane foam; allowing the reacting chemicals of the joint filling material to expand and be contained in the annular space and the chambers; and interlocking the high density, open cell polyurethane foam formed by polyurethane chemicals in the annular space with the ridges on the cover during the step of allowing the reacting chemicals to expand and be contained in the annular space and the chambers.