GRID-LINED, PRE-DIMPLED, DOUBLE-LAYER, MECHANICALLY LINED PIPE, AND LINING PIPE THEREOF

摘要

A grid-lined, pre-dimpled, double-layer, mechanically lined pipe, and an outer pipe and lining pipe thereof. The outer wall of the lining pipe is closely attached on the inner wall of the outer pipe; there is a plurality of non-attached plastically deformed areas between the outer wall of the lining pipe and the inner wall of the outer pipe; the plastically deformed areas are on the surface of the lining pipe and is downwardly recessed towards the center of the lining pipe; the positions of the plastically deformed areas are the positions of critical flaws of the lining pipe; the critical flaws are periodically and artificially set flaws. According to the grid-lined, pre-dimpled, double-layer, mechanically lined pipe, and the outer pipe and lining pipe thereof, the contact structure between the inner pipe and the outer pipe is changed by artificially providing multiple periodically and regularly arranged critical flaws, such that irregular flaws randomly generated on the liner are avoided.