Process for the sealing and internal repair of systems of laid c

Details Process for the sealing and internal repair of systems of laid c Process for the sealing and internal repair of systems of laid c

1995-06-02

1997-04-22

Graham, Gary K.

Pipes and tubular conduits

Repairing

264 36, 2940201, 427235, 427236, F16L 5700

Patent

active

056222092

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.

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