METHOD OF PIPE-LINE REPAIR Russian patent published in 2001 - IPC

FIELD: building industry, main pipe-lines repair. SUBSTANCE: before filling the repairing part of the pipe-line packets of the pipe-line are filled up with inert material which is preliminarily packed for 5-7 hours. The inert material, for example, sand or sand-gravel mixture is hardly packed when being wet. The bottom part of the profile and the periphery zone of stress-corrosion risk are provided with coffer-dams made from inert material, for example, from sand-gravel mixture. EFFECT: reduced probability of corrosion cracking under the pressure of the repaired part of the pipe-line. 1 dwg