RU2003111096A - COUPLING FOR PIPELINE REPAIR AND METHOD OF INSTALLATION - Google Patents

Claims (8)

1. A coupling for repairing a pipeline, including a flexible tape installed on a pipeline with a defect blocked by an elastic gasket, with a connector made in the form of a loop grip with an embedded element and provided with a tension mechanism, characterized in that the loop captures with embedded elements are made at both ends of the connector , tightened by screw connections of the type "nut-stud-nut", and the nuts are placed in the recesses of the embedded elements without the possibility of rotation around its axis and interact with the studs on the right and left thread of each screw connection, and the flexible tape is made of oriented fiberglass with cavities in the area of loop grips filled with foam. 2. The coupling according to claim 1, mounted on a pipeline with longitudinal welds, characterized in that the flexible tape in diametrically opposite sections, shifted relative to the plane of the connectors by a quarter of the circumference, is provided with internal longitudinal grooves without reducing the cross-sectional area of the flexible tape in the grooves intended for placement of longitudinal welds of the pipeline. 3. The coupling according to claims 1 and 2, characterized in that between the flexible tape and the defect there is a plate with a smooth decrease in thickness from the middle section to the edges in the circumferential direction. 4. The coupling according to claims 1 and 2, mounted on a pipeline with longitudinal welds, characterized in that the plate in the middle section of the longitudinal direction has an internal groove facing the surface of the pipeline and accommodates its longitudinal weld. 5. The coupling according to claims 1 to 4, characterized in that the elastic gasket is made of an adhesive layer with a filler, for example, epoxy adhesive with asbestos fibers, and polyurethane foam is used as the foam. 6. The method of installing the coupling on the defective section of the pipeline, including opening the defective pipeline, removing the insulation coating and cleaning the surface on the defective section, applying an adhesive layer thereon, installing a flexible tape on the adhesive layer and tensioning the flexible tape, characterized in that after cleaning the surface of the pipeline on the defective area, local curvature in the circumferential direction is determined, it is compared with the nominal curvature according to the dependencies

where R ₀ is the nominal value of the radius of the pipeline on the outer surface, m; R is the actual value of the radius on the defective area, m, moreover, when dependence (1) is realized, after applying the adhesive layer, the coupling is installed according to claims 1, 3, 5 by blocking the defective area with a plate, installing a flexible tape around the defective area with the plate, tensioning the flexible tape by tightening the screw joints, while the tension force flexible tape choose the larger of the conditions

where P _in - internal (working) pressure of the pumped medium, MPa; In - the width of the flexible tape, m; R ₀ is the nominal radius of the cross section of the pipeline, m; N is the tension force of the flexible tape, MN; R _PL is the radius of the outer surface of the plate, m; To _ol - the coefficient of decrease in the strength of the wall of the pipeline in the defective area, dimensionless value, and when dependency (2) is realized, after applying the adhesive layer, a sleeve is installed by blocking the defective area with flexible tape, tensioning the flexible tape by tightening the screw joints, and the tension force of the flexible tape is selected from condition (3). 7. A method of installing a coupling on a defective section of a pipeline having longitudinal welds according to claim 6, characterized in that a flexible tape with diametrically opposed grooves is installed by aligning the grooves with the sections of the longitudinal welds, and the tension force is selected from condition (3) . 8. The method of installing the coupling on the defective section of the pipeline located along the longitudinal welds according to claim 6, characterized in that the plate with the groove is installed on the defective section by combining the groove with the longitudinal weld, the tension force being selected according to conditions (3), (4).