FIELD: machine building.
SUBSTANCE: in a welded joint of pipes with inner coating a backing bush is made as a compound one consisting of two bushes with the inner bush being produced from corrosion-resistant steel and the outer bush - from carbon steel. The backing bush is fixed at a pipeline through the annular collar of the outer bush by the pipe welded joint and the length of the inner bush exceeds the length of the outer bush. Ends of the outer and inner bushes are glued to the inner surface of the coated pipes by mastic and the area near the weld seam is filled by foamed material.
EFFECT: improved reliability of corrosion protection for a welded seam and its adjacent zone of welded joints of pipes in a pipeline.
1 dwg
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