Expandable tube apparatus for repairing pipelines

Details Expandable tube apparatus for repairing pipelines Expandable tube apparatus for repairing pipelines

1989-08-01

1991-08-27

Bryant, III, James E.

Pipes and tubular conduits

Repairing

Patches

138 97, F16L 5518

Patent

active

050425323

ABSTRACT:
Pipeline repair and leak sealing are effected by unrolling a tube, using an inflatable mandrel disposed inside the tube, to radially expand a stretchable and circumferentially continuous gasket or sealant sleeve into flush contact with the pipeline interior. Before actuation, the tube is constrained in a rolled-up condition by a shrink-wrap sleeve of plastic film that may be sealed at its ends to an interior film sleeve in order to protect the tube against moisture. When fully expanded, the tube includes longitudinally-extending edges that overlap and are secured together by adhesive issued from a rupturable package disposed proximate one of the edges so as to be caused to burst as the edges approach overlapped positions. An outer sleeve of scrim material surrounds the tacky or gum-like gasket sleeve to facilitate handling and movement of the assembly in the pipeline. When the tube and gasket sleeve are expanded, the scrim material becomes embedded in the tacky gasket sleeve material which thereby protrudes through the scrim interstices to assure proper sealing and compression of the gasket sleeve against the pipeline interior wall.

REFERENCES:
patent: 2583316 (1952-01-01), Bannister
patent: 3700265 (1972-10-01), Dufour et al.
patent: 4109684 (1978-08-01), Fernandez
patent: 4207130 (1980-06-01), Barber
patent: 4346922 (1982-08-01), Ohtsuga et al.
patent: 4347018 (1982-08-01), Wrightson et al.
patent: 4386629 (1983-06-01), Cook et al.
patent: 4589447 (1986-05-01), Kane et al.
patent: 4647072 (1987-03-01), Westman

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