FIELD: repair of pipe lines. SUBSTANCE: applying coat to side pipe line leading to main pipe line consists in turning the tubular coat soaked with resin inside out through elbow located in main pipe line. Turning the coat inside out is effected by means of pressure fluid medium fed via pressure tube. Elbow is held in place by chamber charged with above-mentioned fluid medium; this chamber is also used for sealing the joint of side and main pipe lines. Chamber is so constructed that at least one additional pressure tube may pass after sealing device, thus making it possible to apply coat to second side pipe line in similar way during hardening of first coat. EFFECT: enhanced efficiency. 4 cl, 7 dwg
