Pipes and tubular conduits – Repairing
Patent
1994-01-25
1996-03-19
Graham, Gary K.
Pipes and tubular conduits
Repairing
264 36, 2940201, 427235, 427236, F16L 5700
Patent
active
054996597
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.
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