Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1994-03-18
1995-08-01
Corbin, David H.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
405173, F16L 126
Patent
active
054375177
ABSTRACT:
A method, using a crane-equipped depot ship, for automatically repairing an underwater pipeline even if installed at great depth, comprising substantially the following steps: cutting off the damaged pipe piece by a single working module which, lowered onto the sea bed by a crane and clamped about said pipeline, removably supports the cutting apparatus; removing the concrete from the facing ends of the cut pipeline by said single working module which removably supports the removal apparatus, this being provided with an expansion-centering head; installing connectors by a sonar head alignment apparatus removably supported by said working module; and installing the replacement pipe piece by said working module using a reference and guide apparatus clamped about said ends of the pipeline. Specific apparatus for implementing the method are also described.
REFERENCES:
patent: 4203687 (1980-05-01), Sumner
patent: 4234268 (1980-11-01), Scodino
patent: 4832530 (1989-05-01), Andersen et al.
Carrioli Paolo
Montesi Massimo
Corbin David H.
Hoare, Jr. George P.
Snamprogetti S.p.A.
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