F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
61/5.2
F16L 55/10 (2006.01) F16L 1/20 (2006.01) F16L 55/12 (2006.01) F16L 55/128 (2006.01)
Patent
CA 1188113
UNDERWATER PIPELINE SEALING APPARATUS ABSTRACT Apparatus for preventing flow of water from a first underwater pipeline portion forward of the apparatus to a second underwater pipeline portion rearward of the apparatus. At least one wedge-shaped member is mounted on a carriage of the apparatus for grippingly engaging the internal wall of a pipeline for preventing movement of the apparatus in a rearwardly direction upon application of force to the carriage urging the carriage in a rearwardly direction in the pipeline. In order to provide frictional contact with the pipeline wall so that gripping engagement thereof may be effected, the member is continually urged into sliding engagement with the pipeline wall during movement of the apparatus through the pipeline in a forwardly direction. The apparatus is further provided with an annular elastomeric member responsive to water pressure from forwardly of the apparatus for sealingly engaging the pipeline wall to prevent flow of water from the first underwater pipeline portion to the second underwater pipeline portion.
421382
Fern Derek T.
Harrison Gary E.
Mcdermott Incorporated
Ridout & Maybee Llp
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