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US 4,358,417 AGranted
Method for repairing a pipe coupling
AssigneeAMP Incorporated
InventorErnest L. Beinhauer
Life of this patent
Estimating the term…
Abstract
Method of repairing a leaking bell and spigot joint employing a containment which is fit around the coupling to form a completely enclosed annular cavity. A premixed fluid composition comprising an acrylic, a resin, a filler, and a blowing agent is injected into the cavity. This hardens exothermically, providing heat to activate the blowing agent and expand the composition as it sets, forcing the composition into any irregularities to seal the leak and leave a pressurized acrylic sealing ring on the pipe.
Claims5
A method for repairing a leaking portion of a pipe member which comprises the following steps:
- providing containment means around said leaking portion of said pipe member, said containment means having a first end and a second end, each said end having an aperture profiled to fit closely around the circumference of said pipe member, said containment means defining a cavity between said ends and around said pipe member, said containment means comprising at least two pieces assembled around said pipe member,
- securing said containment means to said pipe member so that said leaking portion communicates with said cavity,
- injecting a chemical composition in fluid form into said cavity, said composition filling said cavity, said composition subsequently hardening to form an impermeable solid, said composition expanding after injection, whereby,
- said composition will expand in said cavity to fill any irregularities therein and thereby seal said leaking portion.
1 more element
Dependencies are inferred from the claim text.