STEEL PIPE WITH INTERNAL PLASTIC SHELL Russian patent published in 2010 - IPC F16L9/02 

FIELD: machine building.

SUBSTANCE: pipe with internal plastic shell consists of concentric arranged external bushings out of carbon steel and internal bushings out of corrosion resistant steel inserted inside calibrated ends of pipe. The external bushings are arranged inside ends of the shell and the pipe, while the internal ones close end sections of the pipe with a remote shell, partially are introduced inside the ends of the shell and hold them down to pipe surface. The pipe is equipped with assembly bushings out of carbon steel placed in the internal bushings so, as to overlap zones of bushing ends holding down; the assembly bushings have circular lugs on internal ends resting against ends of the internal bushings.

EFFECT: raised reliability of pipe.

8 cl, 4 dwg