Flexible pipe with internal gasproof undulating metal tube

Details Flexible pipe with internal gasproof undulating metal tube Flexible pipe with internal gasproof undulating metal tube

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 11/15 (2006.01) F16L 9/06 (2006.01) F16L 9/147 (2006.01) F16L 11/12 (2006.01) F16L 58/02 (2006.01)

Patent

CA 2245738

The invention concerns a flexible conduit comprising an internal gasproof undulating metal tube (1), the wall of which has helical undulations (8), the external surface of said internal tube having at least concave (10) and convex (11) rounded parts corresponding to the internal and external parts of the undulations respectively, and at least an arch (2) arranged around said internal metal tube and made up of at least a form wire (9) coiled in spires. The invention is characterised in that the arch (2) has an internal surface with helical undulation, comprising at least concave (16) and convex (15) rounded parts and the external surface of the internal metal tube is supported in its concave rounded part (10) by a convex part (15) of the arch (2) internal surface and in its convex rounded part (11) by a concave part (16) of the arch internal surface, said internal arch surface and said internal tube external surface matching in form, and the interstices (i) between the adjacent spires are small. The invention is particularly applicable to flexible conduits used in oil mining.

Elle est du type comprenant un tube métallique interne étanche (1), dont la paroi présente des ondulations hélicoïdales (8), la surface extérieure dudit tube interne présentant au moins des parties arrondies concaves (10) et convexes (11) correspondant respectivement aux parties interne et externe des ondulations, ainsi qu'au moins une voûte de pression (2) disposée autour dudit tube métallique interne et constituée par au moins un fil métallique de forme (9) enroulé sous forme de spires et elle est caractérisée en ce que la voûte de pression (2) présente une surface intérieure ondulée en hélice, comprenant au moins des parties arrondies concaves (16) et convexes (15), et en ce que la surface extérieure du tube métallique interne est en appui dans sa partie arrondie concave (10) sur une partie convexe (15) de la surface intérieure de la voûte de pression (2) et dans sa partie arrondie convexe (11) sur une partie concave (16) de la surface intérieure de la voûte de pression, lesdites surfaces intérieure de la voûte et extérieure du tube interne étant en correspondance de forme, et en ce que les interstices (i) entre spires consécutives sont faibles. Application notamment aux conduites flexibles utilisées dans l'exploitation pétrolière.

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