A system for connecting undersea pipes at great depths

Details A system for connecting undersea pipes at great depths A system for connecting undersea pipes at great depths

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 17/00 (2006.01) F16L 37/00 (2006.01) F16L 37/62 (2006.01)

Patent

CA 2704703

A system for connecting undersea pipes at great depths comprises a rigid and resilient casing (B) of thickness that becomes e2 when immersed with the hydrostatic pressure acting on its outside surface being greater than the pressure acting on its wall. This reduction in thickness enables the casing to be inserted between two companion flanges (30) that are welded to the ends of the tubes for connecting together, which tubes are held in setbacks (27) machined in a bracket (A). When the pressure difference that gives rise to the elastic deformation of the casing is equalized by means of a pressure-equalizing valve, the bracket opposes a reaction force equal and opposite to the elastic force developed by the casing, which is prevented from returning its initial thickness, with its thickness being limited to e3. This thickness difference corresponds to the elastic potential energy stored by lowering the casing and it represents the magnitude of the clamping force applied by the coupling system in the bracket.

Système de raccordement de tuyauteries sous-marines en grandes profondeurs composé d'une enveloppe (B) rigide et élastique dont l'épaisseur devient e2 lorsque immergée la pression hydrostatique agissant sur sa surface extérieure est supérieure à celle agissant sur sa paroi. Cette diminution d'épaisseur permet l'introduction de l'enveloppe entre deux contre-brides (30) soudées à l'extrémité des tubes à raccorder, lesquels sont immobilisés dans des logements (27) usinés dans un étrier (A). Lorsque la pression différentielle à l'origine de la déformation élastique de l'enveloppe est neutralisée au moyen de la valve d'équilibrage, l'étrier oppose une force réactive égale et opposée à la force élastique développée par l'enveloppe, laquelle ne peut reprendre son épaisseur initiale qui se trouve limitée à l'épaisseur e3. La différence d'épaisseur correspond à l'énergie potentielle élastique emmagasinée au cours de la descente par l'enveloppe et représentant l'intensité de la force de serrage du système de raccordement dans l'étrier.

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