METHOD AND DEVICE FOR RESTORATION OF PIPE LINE Russian patent published in 2003 - IPC

FIELD: erection and repair of pipe lines and corrosion protection of their inner surfaces. SUBSTANCE: fabric cloth is turned in spiral in way perpendicular to its longer side; envelope thus obtained is coated with adhesive and is introduced in pipe line; ends of envelope are turned outside and are secured on pipe line over its perimeter. Envelope is inserted, moved and pressed to inner surface of pipe line by airtight film sleeve. Excessive pressure of air in film sleeve is built up by means of hydraulic seal on side of inlet end of pipe line. EFFECT: extended functional capabilities. 3 cl, 2 dwg