Abstract: A process for the sealing and internal repair of systems of laid conduits in which a sealant is introduced into the leaky conduit by means of water, the sealant being a finely divided, inert material. The conduit is emptied and compressed air charged with particles of an abrasive substance is blown through it. The conduit is then internally coated by blowing into it a solvent-free epoxy resin containing a hardener and fibers. Alternatively, the sealant is introduced into the leaky conduit by means of air, the sealant being dry, finely ground, water-swellable bentonite; a dry, hydraulically disintegratable plastic dispersion preparation; or a mixture thereof. The conduit is then filled with a fluid, the fluid being either water or a mixture of steam and air.

Abstract: A process for the sealing and internal repair of systems of laid conduits in which a sealant is introduced into the leaky conduit by means of air, the sealant being dry, finely ground, water-swellable bentonite; a dry, hydraulically disintegratable plastic dispersion preparation; or a mixture thereof. The conduit is then filled with a fluid, the fluid being either water or a mixture of steam and air. Alternatively, the sealant is introduced into the leaky conduit by means of water, the sealant being a finely divided, inert material. The conduit is emptied and compressed air charged with particles of an abrasive substance is blown through it. The conduit is then internally coated by blowing into it a solvent-free epoxy resin containing a hardener and fibers.

Abstract: A method for the repair of the inside of installed conduits comprises the following method steps:drying of the inside of the line by flow-through of pre-dried compressed air,removal of interior coatings by flow-through of a mixture of compressed air and particles of an abrasive medium with a mean exterior diameter of >0.8 mm and a specific weight of >3.0 g.multidot.cm.sup.-3 in an amount of >1.0 g.multidot.m.sup.-3, the mixture flowing through the line with a mean speed of >10 m.multidot.s.sup.-1, relative to normal pressure, andblowing out the line by means of pre-dried compressed air.The adhesive resin utilized for the subsequent coating contains, among others, a solvent-free 2-component resin and at least 5% by weight of finely dispersed inorganic oxidic adhesives.