PIPE WITH INNER COVERING AND ALIGNING UNIT FOR ASSEMBLING PIPES Russian patent published in 2005 - IPC

FIELD: non-disconnectible pipe joints.

SUBSTANCE: pipe is provided with coupling members at its ends. The coupling members are hermetically sealed, overlap the axis and form coaxial ring space near the free end. The length of the wall of the coupling members exceeds the length of the zone of destructive heating of covering during welding. The minimum thickness of the coupling member wall is determined from the formula S_CM=S_TR_TD_M/R_CMD_T, where S_T and S_CM are the thickness of pipe and coupling member, D_T and D_M are the outer diameter of pipe and coupling member, and R_T and R_CM are the limiting yield of materials of pipe and coupling member, respectively. The section of outer surface of the pipe adjacent to the face, inner diameter of the coupling member, and the length of ring space allow receiving the aligning unit to provide abutting the faces of coupling members for welding. The aligning unit is made of a bushing which receives the sealing rings for sealing the faces and outer surfaces of the pipe in the ring space.

EFFECT: enhanced operate reliability and service life.

19 cl, 3 dwg