Underwater pipeline apparatus for delivering a pig unit by flood

Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...

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405171, 138 97, 15 35, F16L 100, F16L 112

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active

059279010

ABSTRACT:
An underwater pipeline apparatus for delivering a pig unit through an initially air or gas-containing sea-bed pipeline from an entry point toward an exit point. The apparatus includes an inlet conduit for coupling to a pipeline inlet port at a location behind the pig unit in its intended direction of travel, from the entry point to the exit point, having an opening to the sea to admit pressurised water into the pipeline under the head of water above the pipeline and means to regulate flow of water through the inlet conduit into a pipeline to regulate the speed of delivery of the pig unit along the pipeline.

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patent: 4493589 (1985-01-01), Ward
patent: 5139576 (1992-08-01), Davis
patent: 5184921 (1993-02-01), Hancock

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