CONNECTION OF METAL PIPES Russian patent published in 2014 - IPC F16L13/00 B23K31/02 

FIELD: machine building.

SUBSTANCE: connection consists of two pipes welded with each other and a metal bushing arranged inside featuring a cylindrical groove provided in the central portion and annular grooves in the end-face areas and anticorrosion coating on the surface except the cylindrical groove, with heat-insulation material and setting stops in the cylindrical groove, with sealing elements in the annular grooves and sealing material in a gap between pipes and the bushing. A split ring made of non-combustible heat-insulation material is used as the insulation material. A split metal ring with protrusions in the form of a semi-sphere and air volume under the protrusions is used as the setting stops. The split metal ring is installed upon the split ring of non-combustible heat-insulation material and its ends are interconnected by spot welding. The rubber rings featuring end-face surfaces and protruding fins of different height are used as the sealing elements in the annular grooves. A welding seam connects the metal pipes with the split metal ring. A relation of thickness of the split metal ring and the wall thickness equals 1:(3-5). The height of the metal ring protrusions exceeds its thickness.

EFFECT: invention increases reliability of the joint.

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