INTERNAL INSERT FOR SEALING WELDED JOINT OF PIPELINE Russian patent published in 2019 - IPC F16L13/06 F16L55/163 

FIELD: technological processes.

SUBSTANCE: invention relates to an internal insert for sealing a welded joint of a pipeline in the form of metal pipes connected by a welded seam with a protective coating applied on their inner surface. Insert contains a thermal insulation material, a sealing material, steel protrusions and a flexible rubber-metal element. Rubber-metal element consists of a comb-shaped rubber sealing profile located on the outer surface of the rubber-metal element and adapted to fit snugly to the inner surface of the pipeline, and reinforcing steel rings, equally spaced relative to each other and cured-on to the rubber layers of the comb profile. Said steel protrusions uniformly placed in the radial plane are welded to the central reinforcing steel ring in its central plane. Sealing material is applied to the comb profile, and the insulating material is placed on the outer surface of the central reinforcing steel ring.

EFFECT: as a result, the reliability increases and the service life of the welded pipe joint increases.

1 cl, 2 dwg