Pipes and tubular conduits – With closures and plugs – Inflatable
Patent
1998-06-05
1999-05-11
Ferensic, Denise L.
Pipes and tubular conduits
With closures and plugs
Inflatable
138 89, F16L55/12
Patent
active
059017520
ABSTRACT:
A pipe sealing apparatus insertable inside a pipe and inflatable therein to prevent fluid flow through the pipe includes an elongated inflatable sleeve of elastomeric material and an elongated outer sleeve substantially surrounding the inflatable sleeve. The inflatable sleeve is shiftable with respect to the outer sleeve during inflation of the inflatable sleeves. An intermediate sleeve, shiftable with respect to each of the inflatable sleeve and outer sleeve, may be provided between the inflatable sleeve and the outer sleeve. The ends of the inflatable, intermediate, and outer sleeves may be folded and clampingly sealed to each other to provide a fluid-tight seal at opposite ends of the sealing apparatus. A flexible cylindrical member may extend through the inflatable sleeve between the opposite ends thereof, an inflatable space being defined between the cylindrical member and the inflatable sleeve.
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Ferensic Denise L.
Hook James F.
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