Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Reexamination Certificate
2011-07-26
2011-07-26
Bagnell, David J (Department: 3672)
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
C405S158000, C405S184000, C441S133000
Reexamination Certificate
active
07985036
ABSTRACT:
Process for the towing of underwater pipelines by means of head tugs for the pulling and tail tugs for the counter-pulling characterized in that it is effected by the use of a set of equipment, connected to the pipeline itself, including floats, of which at least a part has a variable buoyancy or partially variable buoyancy, which, when placed in a pre-established position and at pre-established intervals, provide a graded buoyancy to the pipeline in relation to the distance from the bed so as to obtain a “festoon” configuration of the pipeline, i.e. with suspended sections of pipeline, in correspondence with the floats, alternating with resting sections.
REFERENCES:
patent: 3727417 (1973-04-01), Shaw
patent: 4011729 (1977-03-01), Kermel
patent: 4037425 (1977-07-01), Berg
patent: 4107933 (1978-08-01), Lamy
patent: 4121529 (1978-10-01), Smith et al.
patent: 4138853 (1979-02-01), Lamy
patent: 4183697 (1980-01-01), Lamy
patent: 1 434 357 (1976-05-01), None
Bregonzio Valerio
Giovannini Umberto
Passerini Antonio
Bagnell David J
Fiorello Benjamin
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Saipem S.p.A.
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