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Societe Anonyme Dite: Aerospatiale Societe Nationale Industrielle

Pierre Schaeffner

Jean Guesnon

Christian Gaillard

Pascal D Coquet

Christophe Blois

High-pressure pipe element made of a hooped tube for making lines referred to as kill lines and choke lines that equip oil production installations, notably offshore. The high-pressure pipe element is an assembly consisting of two connections ( ) and ( ) respectively welded to the two ends of a metallic tube ( ). The metallic assembly is hooped. Hooping ( ) covering tube ( ) comprises a sufficient number of hooping layers to withstand a determined internal pressure. Transition zones ( ) and ( ) in the vicinity of the welds comprise additional hooping layers.

High-pressure pipe element made of a hooded tube

Vessel for storing a fluid under pressure, such as a gas storage vessel, of the type comprising an internal casing surrounded by an external hooping. The internal casing has symmetry about a longitudinal axis, a central pipe section and two extremity portions, and at least one of the extremity portions protruding outwardly. The hooping is of reinforcing fibers coated with a thermoplastic of thermosetting binder, and opposite the pipe section the hooping has at least one layer of fibers, known as longitudinal fibers, having a flat winding pattern and a winding angle as small as possible, so as to allow a boss, centered on the longitudinal axis of the protruded extremity, to be uncovered with fibers. Further, the hooping has at least one layer of fibers, known as circumferential fibers, having an almost 90.degree. winding angle. Moreover, the pipe section further comprises at least one layer of fibers having a winding pattern that is either flat or helical with a winding angle (.alpha..sub.n) of between the angle (.alpha.) of the longitudinal fibers and 90.degree..

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Le Haillan, France

Pierre Schaeffner