CONNECTION METHOD FOR LINED PIPELINE SECTIONS Russian patent published in 2022 - IPC F16L13/02 

FIELD: pipeline equipment.

SUBSTANCE: invention relates to pipeline equipment and can be used for permanent welded connection of sections of lined pipelines used, for example, for transportation of well products. The method includes connecting the end sections of the sections of the lined pipeline 1, in each of which a sleeve 2 is installed flush with the end of the metal base 3 of the pipeline 1, and subsequent welding. Before installing the bushings 2 on the end sections of the sections of the connected metal-polymer pipeline 1 for a length L1 along the entire lateral inner surface, the thickness of the polymer coating 4 of the inner plastic lining is removed by diameter D1. Part of the length of the outer side surface of both bushings 2 is adjusted to the length L1 under the inner diameter D1 of the removed section of the polymer coating 4 of the inner plastic lining of pipeline sections 1. A high-temperature sealant 5 is applied to the outer surface of length L1 of diameter D1 of each sleeve 2 to ensure tightness between the polymer and metal, after which the surfaces of the sleeves 2 with the sealant 5 applied are pressed into each of the end sections of the sections of the metal-plastic pipeline 1 flush with the chamfers of the metal base 3 to the length L1 From the outer side surface of the insulating pipe 6 of each of the end sections of the sections of the metal-plastic pipeline 1, a part of the insulating coating is removed, after which the end parts of the bushings 2 and both parts of the metal base 3 of the sections of the metal-plastic pipeline 1 are welded.

EFFECT: pipeline equipment improvement.

1 cl, 1 dwg