METHOD OF SEALING-UP AND PERFORMING INTERNAL REPAIR OF UNDERGROUND PIPING SYSTEMS AND DEVICE FOR REALIZATION OF THIS METHOD Russian patent published in 1998 - IPC

FIELD: repair of underground lines having small internal diameters. SUBSTANCE: sealant containing finely ground bentonite and/or hydraulically disintegrated dispersion of dry-prepared plastic and inert additions is charged by jets into pipe line and vapor-air mixture is kept in this pipe line at excessive pressure equal to or more than 2 bars or pipe line is filled and flushed with water or inert filling material is introduced in flow of water. Device proposed for realization of this method is additionally provided with compressed air distributor with air supply and air discharge branch pipes, pipe line fittings including valves and pressure meters and humidifier. EFFECT: enhanced efficiency. 14 cl, 7 dwg