STEEL PIPE CORROSION PROTECTION METHOD Russian patent published in 2003 - IPC

FIELD: piping systems. SUBSTANCE: invention can be used in construction and repair of pipelines. According to proposed method, inner surface of pipe is lined with plastic. Inner surface of pipe ends is lined with corrosion-resistant steel over length exceeding length of zone of thermal destruction of plastic envelope from place of pipe welding. Ends of plastic envelope are connected to pipe by clamping rings using radial deformation of rings or pipe. End pieces calibrated over inner diameter are welded to ends of pipe. Said end pieces are provided with inner lining of corrosion-resistant steel. Length of end pieces exceeds length of zone of thermal destruction of plastic envelope. Lining of pipe is carried out with overlapping of part of end piece length. Clamping rings are corrosion resistant. Inner surface of clamping rings is lined with layer of corrosion-resistant steel and outer and end face surfaces of rings are provided with corrosion- resistant polymeric coating. EFFECT: improved reliability of pipelines. 2 cl, 4 dwg