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AssigneeInstitut Francais du Petrole
InventorsJacques Delacour, Jacques Jarrin, Bernard Dewimille, Francois Dawans
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Disclosed is a rigid or flexible conduit usable particularly for transporting fluids and enabling to limit the permeability to transported fluids. According to the invention, the conduit comprises at least an inner flexible sheath (1) made of thermoplastic, elastic, or rubber material and an outer sheath (10) comprising a metal layer (3) and arranged around said inner sheath (1). Said metal layer comprises at least a layer of flat metal band (3) which is spirally wound with a winding angle .alpha. higher than 50.degree. and lower than 90.degree. with respect to the axes of the conduit. For rigid conduits, said metal layer (3) is adhered to said inner flexible sheath (1) on the major part of the width of the band (3). For flexible conduits, the turns present superposition areas so as to provide for a complete covering of said inner sheath (1), the superposition areas (30) of the band turns on one hand and the areas comprised between said superposition areas on the other hand, having each a width at least equal to amplitude of the deformation imposed to the outer sheath by the maximum bending or traction of the conduit. Application particularly to the transportion of corrosive fluids under pressure, to the oil industry at the drilling site or the production.
A pipe useful for transporting fluids which may be under pressure having limited permeability to fluids transported therein, said pipe comprising a flexible inner sheath made of a thermoplastic material or elastomer, an outer sheath comprised of an outer envelope of a flexible polymeric material and a metal layer disposed around said inner sheath, said metal layer comprising at least one layer of flexible, thin and flat metal band wound spirally at a winding angle .alpha. greater than 50.degree. and less than 90.degree. to an axis of the pipe, turns of said at least one layer of a flexible, thin and flat metal band having overlapping zones to ensure total wrapping of said inner sheath, said overlapping zones being provided by consecutive turns of the at least one layer of a flexible, thin and flat metal band, the overlapping zones of the turns and zones between said overlapping zones both having widths at least equal to a degree of deformation imposed on the outer sheath by maximum stretching and bending of the pipe;
Dependencies are inferred from the claim text.