Device for limiting the lateral buckling of armouring plies...

Pipes and tubular conduits – Flexible – Spirally wound material

Reexamination Certificate

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C138S138000, C138S144000

Reexamination Certificate

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06966344

ABSTRACT:
For limiting the lateral buckling of tensile armor plies of an underwater flexible pipe, that can be used in the offshore oil industry, the plies include from the outside inward, at least one external polymer sheath, a first outward retention layer of a defined thickness K1wound around an upper outer tensile armor ply, at least one second inward retention layer of a defined stiffness K2wound around each of at least one lower inner tensile armor ply. Stiffness K2is preferably less than stiffness K1, i.e., the retention layers outward are less stiff. There is then an internal polymer sheath.

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