METHOD OF REPAIR OF PIPE Russian patent published in 1998 - IPC

FIELD: repair of pipe lines under pressure without stopping them. SUBSTANCE: defective areas are located by standard methods, after which soil is removed around pipe line, any anticorrosive coats are removed and surface of pipe line is cleaned. Recesses, grooves and corrosion pits are filled with non-hardened filling material and several layers of rupture-resistant material till filling material is in non-hardened deformable state; layers of hardening adhesive are applied between adjacent layers of winding. Adhesive is then hardened shifting to coherence state; filling material is hardened by shifting it to stiff state to withstand immediately pressure of liquid contained in pipe line in area of strengthening bandage. applying an adhesive is not obligatory, but if adhesive is applied between surface of pipe line and first turn of strengthening bandage, it shall be compatible with filling material so that they are fully hardened; it shall be also compatible with anticorrosive material remaining on pipe line. Method may be applied for repair of rectilinear and bent sections of pipe lines. EFFECT: enhanced reliability. 29 cl, 13 dwg