초록 ▼

In a method for reinforcing defective portions of a pipeline, the defective portions are identified by conventional techniques, soil is excavated from around the pipeline to expose the deteriorated portions, any corrosion protection material is removed and the surface of the pipeline is cleaned. Gou

In a method for reinforcing defective portions of a pipeline, the defective portions are identified by conventional techniques, soil is excavated from around the pipeline to expose the deteriorated portions, any corrosion protection material is removed and the surface of the pipeline is cleaned. Gouges, dents and corrosion pitting are filled with an uncured filler material and, while the filler material is in an uncured workable state, a plurality of convolutions of a high tensile strength material are wrapped around the defective portion of the pipeline with a layer of a curable adhesive applied between adjacent convolutions. The adhesive then cures to a strongly adhesive state and the filler material cures to a rigid state capable of transferring the fluid pressure load within the pipeline almost instantaneously to the reinforcement band. Optionally, a layer of adhesive may be applied between the pipeline surface and the first convolution of the reinforcement band, in which case the adhesive must be compatible with the filler material so that both materials are able to cure fully, and also compatible with any corrosion protection material remaining on the pipeline. The method may be employed to reinforce both straight and bent portions of a pipeline.

대표청구항 ▼

A method for repairing a pipe adapted to carry an internal load directed radially outward therefrom, said pipe having a defective region defined by at least one cavity extending from an outer surface of said pipe toward the center of said pipe but not extending completely through the wall of said pi

A method for repairing a pipe adapted to carry an internal load directed radially outward therefrom, said pipe having a defective region defined by at least one cavity extending from an outer surface of said pipe toward the center of said pipe but not extending completely through the wall of said pipe, said method comprising the steps of: providing a filler material having a workable uncured state and a rigid cured state, filling said cavity to at least said outer surface of said pipe with said filler material in said workable state, providing at least one band having a plurality of elastic convolutions of high tensile strength material, while said filler material is in said workable state, wrapping said plurality of convolutions of said high tensile strength material about said pipe to form a coil overlying stud filler material, tightening said coil about said pipe so that said filler material completely fills that portion of said cavity underlying said coil, securing at least one of said convolutions to an adjacent one of said convolutions, and permitting said filler material to cure to said rigid state, whereby a load carried by said pipe is transferred substantially instantaneously from said pipe to said coil.