Flexible pipe for riser in off-shore oil production
AssigneeCoflexip
InventorsBruno Roger Seguin, Rene Antoine Maloberti
Life of this patent
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Abstract
It is of the unbonded type and comprises, from the inside outwards, an internal leakproof assembly comprising a pressure vault, a first inner group of tensile armor (5), a second outer group of tensile armor (7) and an external sealing sheath (8), the tensile armor of the said inner and outer groups being wound at a lay angle of less than 55.degree., characterized in that an intermediate sealing sheath (6) is inserted between the two inner (5) and outer (7), groups of tensile armor, the inner group of tensile armor (5) being wound with a short pitch and at a lay angle of greater than 35.degree. and less than 55.degree., and the outer group of tensile armor (7) being wound with a long pitch and with a lay angle of less than 30.degree..
Claims11
A flexible pipe of the unbonded type comprising, from the radial inside outward:
- an internal leak proof assembly comprising an internal carcass, a pressure vault around the carcass, a first inner group of tensile armor being wound at a lay angle of less than 55.degree. around the pressure vault, an intermediate sealing sheath around the first inner group of tensile armor, a second outer group of tensile armor also being wound at a lay angle of less than 55.degree. and the intermediate sealing sheath is between the inner and the outer groups of tensile armor;
- each of the first inner and second outer groups of tensile armor comprises at least two layers of reinforcements wound in opposite directions;
- and the respective lay angles of the first inner and the second outer groups of tensile armor differ from each other by more than 5.degree.;
- and an external sealing sheath around the second outer group of tensile armor.
Dependencies are inferred from the claim text.