Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Reexamination Certificate
2006-07-18
2006-07-18
Lagman, Frederick L. (Department: 3673)
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
Reexamination Certificate
active
07077603
ABSTRACT:
The present invention relates to a device for improving the fatigue strength of a metal pipe a portion of which lies on the sea bottom and one end of which is suspended from a floating support subjected to the dynamic motions of the sea which move the touchdown point (TDP) of the pipe. The device comprises stress limiting means comprising a material (13) inserted between the pipe and the ground, in the vicinity of the touchdown point, the system thus created having a lineic stiffness below 200 kN/m/m and a thickness determined in such a way that the static and cyclic deformations remain allowable.
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French Preliminary Search Report for FR 0314548, Jul. 26, 2004.
Fontaine Emmanuel
Perrin Gilles
Antonelli, Terry Stout and Kraus, LLP.
Institut Francais du Pe'trole
Lagman Frederick L.
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