Patent ID: 8418336

Claim:
A method for repairing a damaged portion of the flow-line of a corrugated metal pipe (CMP), wherein the damaged portion extends from a first point to a second point of the flow-line, comprising: placing a plurality of rigid sheets over the damaged portion in an overlapping manner such that a first sheet covers both the first point and an undamaged portion of the CMP next to the first point and a second sheet covers both the second point and an undamaged portion of the CMP next to the second point, and wherein the sheets cover the CMP from the flow-line and extending to points on its sidewalls that are undamaged along the length of the damaged portion; applying a plurality of fasteners to connect said rigid sheets and CMP, wherein at least one of the fasteners is applied to the overlapping portions of the rigid sheets; applying pressure to the surface of each of the rigid sheets; and injecting a hydro-insensitive expanding polymer into a hole in each of the rigid sheets to fill a space between the sheets and the damaged portion of the CMP.