Method and apparatus for assembling or disassembling an...

F - Mech Eng,Light,Heat,Weapons – 16 – L

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F16L 1/26 (2006.01) B23P 19/06 (2006.01)

Patent

CA 2208248

The invention relates to a method for assembling and disassembling an installation present on a seabed, for instance a pipeline lying on a seabed, wherein components, for instance pipe flanges, are mutually attached by means of nut and bolt connections and the nut and bolt connections are released and/or secured by means of a wrench. Nut and bolt connections are herein released by divers using a wrench. This is heavy and difficult work. It is impossible for divers to operate at considerable depth. Complicated and very costly pipeline connections are then applied which can be released and secured without divers. The invention has for its object to reduce the stated drawbacks of the known method. To this end at least one wrench is used, of which an engagement cup for engaging a nut and/or a bolt head in axial direction of a nut and bolt connection for manipulating is displaceable relative to a cup carrier counter to spring action.

L'invention concerne un procédé permettant de monter et de démonter une installation reposant sur le fond marin, par exemple, un pipe-line placé sur le fond de la mer, dont certains éléments, par exemple, des brides de conduit, sont fixés les uns aux autres au moyen d'accouplements par boulons et écrous serrés ou desserrés au moyen d'une clé. Ces accouplements sont démontés par des plongeurs au moyen d'une clé. Ces opérations sont difficiles et pénibles à réaliser et il est, notamment, impossible aux plongeurs d'intervenir à des profondeurs importantes. On utilise alors des accouplements de pipe-line compliqués et extrêmement coûteux, qu'on peut monter et démonter sans l'intervention de plongeurs. L'invention propose de réduire les inconvénients de l'état actuel de la technique. A cet effet, on utilise au moins une clé présentant une coupelle de contact permettant de manipuler la tête d'un écrou et/ou d'un boulon dans le sens axial de l'accouplement par boulons et écrous et pouvant se déplacer par rapport à un porte-coupelle à l'encontre d'un effet de ressort.

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