Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1981-08-21
1984-03-13
Husar, Cornelius J.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
441133, F16L 104, B63B 2152
Patent
active
044364504
ABSTRACT:
Apparatus for releasably attaching a buoyant module to a submerged pipeline and for releasing the module therefrom is disclosed. The apparatus comprises a strap wrapped over the top of the module and around the underside of the pipeline and a link connected between the opposing ends of the strap. The link is breakable upon application thereto of a design tension greater than that exerted thereon by the positive buoyancy force of the module. The apparatus also comprises a sled slideably mounted on the upper surface of the pipeline, means for engaging the sled to a source of propulsion and a wedge attached to the leading end of the sled which has an inclined surface sloping downwardly from the top of the sled to the pipeline and pryably engageable with the module. The wedge, when propelled by a sufficient force against the module, pries the module from the pipeline by exerting an upward force thereon that exceeds the difference between the design tension and the positive buoyant force of the module to break the link and release the module.
A method for releasing a buoyant module releasably attached to a submerged pipeline by a breakable strap is also disclosed. The method comprises the steps of positioning a sled having a wedged end on the pipeline, actuating coupling arms pivotally attached to the sled to a closed position in which the arms slideably grip the pipeline, and propelling the wedged end of the sled along the pipeline against the module with sufficient force to pry the module substantially upwardly to break the strap and release the module.
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Exxon Production Research Co.
Husar Cornelius J.
Phillips Richard F.
Stodola Nancy J.
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