Threaded assembly of metal tubes designed to contain a...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/08 (2006.01) E21B 17/00 (2006.01) E21B 17/042 (2006.01) F16L 15/04 (2006.01) F16L 58/18 (2006.01)

Patent

CA 2323715

The invention concerns an integral threaded or sleeved assembly of two metal tubes provided or not with an internal coating and in particular designed to contain internally a corrosive fluid. The assembly male element(s) (1) each comprise in the direction of their open end a threaded part (13) and an unthreaded part, the latter comprising successively a sealing metal surface (14), a ring-shaped transverse support surface (15) and a nozzle surface (16) which joins the tube internal peripheral surface (10) via a radial surface (17) called inner end. The female element(s) comprise elements corresponding to the male elements and co-operating therewith. A sealing ring (40) is set between the inner end ring-shaped surfaces (17), (17') and prevents the liquid phase from seeping into the assembly. The assembly is characterised in that it comprises sealing metal male surfaces (14) arranged between threaded part (13) and support surface (15) and by the presence of a clearance between the nozzle outer peripheral surface (16) and the reinforcement inner peripheral surface (26) opposite the female element (2). The invention includes in particular special solutions when the tubes (10') are provided with an internal coating particularly in the form of tubes with inner lining (51), (51'). In such a case, flanges (60), (60') are provided to provide continuity for the coating on the ring-shaped end surfaces.

L'invention a pour objet un assemblage fileté intégral ou manchonné entre deux tubes métalliques munis ou non d'un revêtement intérieur et notamment destinés à contenir intérieurement un fluide corrosif. Le ou les éléments milles (1) de l'assemblage comprennent chacun en allant vers leur extrémité libre une partie filetée (13) et une partie non filetée, cette dernière comprenant successivement une surface métallique d'étanchéité (14), une surface d'appui annulaire transversale (15) et une surface de nez (16) qui rejoint la surface périphérique intérieure du tube (10) par une surface annulaire radiale (17) dite d'extrémité intérieure. Le ou les éléments femelles (2) comprennent des éléments correspondant aux éléments mâles et coopérant avec ceux-ci. Un anneau d'étanchéité (40) est interposé entre les surfaces annulaires d'extrémité intérieure (17, 17') et empêche l'infiltration de phase liquide dans l'assemblage. L'assemblage se caractérise par la présence et la disposition des surfaces métalliques mâles d'étanchéité (14) entre partie filetée (13) et surface d'appui (15) et par l'existence d'un jeu entre la surface périphérique extérieure du nez (16) et la surface périphérique intérieure de renfort (26) en regard sur l'élément femelle (2). L'invention comprend notamment des solutions particulières lorsque les tubes (10, 10') sont munis d'un revêtement intérieur notamment sous forme de tubes de doublage intérieur (51, 51'). Des brides telles que (60, 60') permettent alors de réaliser la continuité du revêtement sur les surfaces annulaires d'extrémité.

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