Pipes and tubular conduits – With closures and plugs – Inflatable
Patent
1979-02-28
1981-09-29
Bryant, III, James E.
Pipes and tubular conduits
With closures and plugs
Inflatable
138 94, 137318, 408121, 408123, F16L 5512, B23B 4512
Patent
active
042917271
ABSTRACT:
An apparatus and process for restricting fluid flow in a pipeline by inflation of an expandable flexible sleeve which is attached to a plug having a through hole for the inflation fluid. Several embodiments of flow restrictor cartridges are disclosed including cartridges having retainer arms which pivot outwardly against the interior wall of the pipeline restricting the axial expansion of the flexible sleeve upon inflation, thereby providing higher pressurization of the flexible sleeve for use in pipelines of pressures up to about 100 psi. The flow restrictor cartridges may be used in combination with an insertion assembly and by placement of a boring tip on the flow restrictor cartridge may be used with a disclosed cartridge insertion tool providing reduced loss of pipeline contents upon boring a hole in the pipeline followed by insertion and inflation of the flexible sleeve for restricting fluid flow in the pipe.
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Bevan Thomas M.
Yie Gene G.
Bryant III James E.
Institute of Gas Technology
Speckman Thomas W.
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