Device for connecting pipelines such that relative motion is...

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F16L 39/06 (2006.01) F16L 17/035 (2006.01) F16L 17/10 (2006.01) F16L 27/087 (2006.01)

Patent

CA 2510666

Device for connecting pipelines conducting fluid under pressure, such that relative movement is allowed between two coupling parts carrying respective coupling ends of the pipelines, with possibility for pressure testing of primary seals before operation, wherein a first of the coupling parts is comprising a central core (1) provided with a bore (60) in longitudinal direction and a radial passage (61) with fluid connection to the longitudinal bore (60), which radial passage (61) has fluid connection with a ring formed passage (62) formed in a second ring formed coupling part (2) that is movable relative to the first coupling part, where facing axial surfaces (surfaces substantially normal to the longitudinal axis) between the second connection part and both the first connection part and an additional part comprising dynamic hydraulic test seals (20, 21), dynamic hydraulic primary seals (22, 23) and dynamic hydraulic secondary seals (24, 25), have constant sealing gap for the dynamic seals (20, 21, 22, 23, 24, 25) independent of the fluid pressure in the passage (62) in the second coupling part, distinguished in that the device is comprising a relative to the first coupling part stationary bearing ring (3), arranged over the second coupling part and equipped with axial pretensioning against the second coupling part with at least one spring and having construction allowing supply of a compensator fluid to a compensator gap that in substance is arranged parallel with the sealing planes and with the bearing ring between the compensator gap and the sealing planes, such that a constant sealing gap can be provided with pretensioning and compensator fluid for all fluid pressures.

L'invention concerne un raccord de tuyaux de transport de liquides sous pression, qui permet un déplacement relatif entre deux parties raccordées portant les extrémités de raccord respectives des tuyaux, ainsi que la vérification de la pression des joints primaires avant le fonctionnement. Une première partie raccordée comprend une partie centrale (1) dotée d'un alésage (60) longitudinal et d'un passage radial (61) en communication fluidique avec l'alésage longitudinal (60), le passage radial (61) étant en communication fluidique avec un passage annulaire (62) formé dans une seconde partie raccordée annulaire (2) qui est mobile par rapport à la première partie raccordée. Par ailleurs, les surfaces axiales qui se font face (les surfaces sensiblement perpendiculaires à l'axe longitudinal) entre la seconde partie raccordée et à la fois la première partie raccordée et une partie supplémentaire comprenant des joints d'épreuve hydraulique dynamiques (20, 21), des joints primaires hydrauliques dynamiques (22, 23) et des joints secondaires hydrauliques dynamiques (24, 25), assurent un espace d'étanchéité constant pour les joints dynamiques (20, 21, 22, 23, 24, 25) quelle que soit la pression fluidique dans le passage (62) de la seconde partie couplée. De plus, ce dispositif est caractérisé en ce qu'il comprend, en rapport avec la première partie couplée, une bague de roulement stationnaire (3), placée au-dessus de la seconde partie couplée et soumise à une précontrainte axiale (opposée à la seconde partie couplée) exercée par au moins un ressort, et dont la configuration permet d'apporter un liquide de compensation dans un espace de compensation qui, généralement, se situe parallèlement aux plans d'étanchéité et à la bague de roulement entre l'espace de compensation et les plans d'étanchéité, de façon à maintenir un espace d'étanchéité à précontrainte et liquide de compensation pour l'ensemble des pressions de fluides.

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