Institut Francais Du Pe'trole

Societe Nationale Industrielle Et Aerospatiale

Claude L Bournazel

Jany Feret

Michel Huvey

Marcel Auberon

Albert Phan

Philippe Pillois

Michel Dolbeau

Daniel Cabanel

A reinforced flexible duct, particularly for transporting pressurized fluid having an internal pressure reinforcement and a traction resisting reinforcement. The internal pressure reinforcement is wound at a high angle with respect to an axis of the duct and the traction resistant reinforcement comprises at least a pair of crossed layers wound at an angle of at most equal to 55.degree.. A ratio of stiffness traction resisting reinforcement to a stiffness of internal pressure resisting reinforcement is between 2.5 and 8 with a winding angle of the pair of cross layers of the traction resisting reinforcement having a value of between 20.degree. and 50.degree.. A ratio K.sub.t /K.sub.p of stiffness and the winding angle .alpha. satisfy the relationship: ##EQU1##

Flexible duct having no appreciable variation in length under the effect

A reinforced flexible duct, particularly for transporting pressurized fluids having an internal pressure reinforcement and a traction resisting reinforcement. The internal pressure reinforcement is wound at a high angle with respect to the axis of the duct and the traction resisting reinforcement comprises at least one pair of crossed layers wound at an angle at most equal to 55.degree.. The modulus of elasticity of the material for the internal pressure resisting reinforcement is smaller than the modulus of elasticity of the material for the traction resisting reinforcement.

There is provided a process for providing a metal connector fixed to a pipe of composite material and a pipe thus made. A pipe carries at one of its extremities a metal connector, and a first film of elastomer being interposed between the two and adhering to each of them an adhesive. At the level of this extremity, the pipe also carries a metal casing which is held solidly on the connector by a band and a second film of an elastomer which is interposed between the casing and the pipe and adheres by means of an adhesive to each of them. The pipes according to the invention are suitable for use in offshore oil exploration.

Process for providing a metal connector fixed to a pipe of composite

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Cernay-la-Ville, France

Claude L Bournazel