Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1984-12-07
1987-05-05
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
405170, 405195, 405211, F16L 3500
Patent
active
046627847
ABSTRACT:
Disclosed in a method of and apparatus for lowering pipe strings and other objects, particularly pipe strings carrying anodes for cathotic protection, into and through the support structure of an offshore plateform. Skid beams are inserted into the support structure of the offshore platform below the top deck of the platform and above the water level, preferably at the plus twelve level of the structure. Mounted to the skid beams are winch and derrick means. The skid beams are inserted into the structure such that the winch and derrick means are positioned over the point at which the pipe string is to be lowered through the structure. The skid beams cantilever out from the structure such that they extend well beyond the outside perimeter of the top deck. The skid beams also serve as track for a trolley. Pipe string sections can be delivered to the trolley either from the top deck of the platform or directly from a barge. The trolley transmports the pipe string sections, one at a time, to the winch and derrick means. The winch and derrick means are used to lift each pipe string section from the trolley and lower it through the support structure of the platform in substantially vertical position. As each section is lowered, it is temporarily supported so that the winch and derrick means may be used to lift and lower the next section. In such way, the pipe string sections to be welded to one another to form a continuous pipe string. The method is particularly useful in delivering anodes for cathotic protection to desired locations within the rigs support structure.
REFERENCES:
patent: 1267129 (1918-05-01), Sewall
patent: 3448511 (1969-06-01), Suter
patent: 3717002 (1973-02-01), O'Brien et al.
patent: 3860122 (1975-01-01), Cernosek
patent: 4068490 (1978-01-01), Jegousse
Bocchetti Mark G.
Reiter Bernard A.
Taylor Dennis L.
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