Method for dispersing and removing sludge contained in a...

B - Operations – Transporting – 08 – B

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B08B 9/093 (2006.01) B65D 88/70 (2006.01)

Patent

CA 2374607

A method and apparatus for cleaning the interior of the storage tanks (100) of the type for storing large volumes of liquids, such as crude oil, wherein hydrocarbon sludge accumulates with the passage of time, such apparatus comprising concentric hollow pipes, a spray nozzle for injecting a flushing fluid, and connecting means including a packing gland (650) which allows the concentric pipes to be movably oriented inside a storage tank through a manway. With this construction, a flushing fluid can be sprayed into a sludge layer in the storage tank through the inner pipe and sludge/flushing fluid withdrawn through the annular region between the concentric pipes. The packing gland (650) in the connecting means and a second packing gland (660) between the inner and outer pipes allows for independent movement of the pipes within the storage tank.

L'invention concerne un procédé et un dispositif de nettoyage de l'intérieur de cuves de stockage (100) du type conservant des volumes importants de liquides, tels que du pétrole brut, et dans lesquelles des dépôts boueux d'hydrocarbures s'accumulent avec le temps. Un tel dispositif comprend des tuyaux creux concentriques, une buse de pulvérisation, destinée à injecter un fluide de rinçage, ainsi que des moyens de raccord comprenant une garniture d'étanchéité (650) permettant aux tuyaux concentriques d'être orientés de façon mobile à l'intérieur de la cuve de stockage, par passage à travers un trou d'homme. Grâce à cet agencement, on peut vaporiser un fluide de rinçage dans une couche de dépôts boueux, dans la cuve, par l'intermédiaire du tuyau intérieur, et on peut retirer les dépôts boueux/le fluide de rinçage par l'intermédiaire de la région annulaire se situant entre les tuyaux concentriques. La garniture d'étanchéité (650) des moyens de raccord et une seconde garniture d'étanchéité (660) placée entre les tuyaux intérieur et extérieur permettent de déplacer de manière indépendante le tuyau dans la cuve de stockage.

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