Pipeline cleaning method and apparatus

B - Operations – Transporting – 08 – B

Patent

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Details

B08B 9/02 (2006.01)

Patent

CA 2283720

A method of cleaning a pipeline (2) for transporting a fluid, in particular a gas, more particularly a gas which forms an explosive mixture when mixed with air, comprises removing debris from the pipeline (2) by means of a collecting device and a removal unit (56). The pipeline (2) is cleaned in a commissioned state, without interrupting the flow of fluid through the pipeline, by removing a mixture of fluid and debris from the pipeline (2) by means of suction, separating the debris from the fluid and re-injecting the cleaned fluid into the pipeline (2). A cleaning unit (10) for carrying out the method according to the invention comprises, connected in series, first means for connecting the cleaning unit to the pipeline, an inlet (12) for purging gas, first valve means (14, 16), one or more separation stages (18, 28, 38) for mechanical separation of debris from the gas/debris mixture, a blower (40) for creating suction, second valve means (48) connected in parallel with the blower (40), third valve means (50, 54), and second means for connecting the cleaning unit to the pipeline.

La présente invention concerne un procédé de nettoyage d'un tuyau (2) destiné à transporter un fluide, en particulier le gaz, et plus particulièrement le gaz formant un mélange explosif lorsqu'il est mélangé avec de l'air. Ce procédé consiste à extraire les débris du tuyau (2) au moyen d'un collecteur et d'une unité d'élimination (56). Le tuyau (2) est nettoyé pendant son fonctionnement, sans que l'écoulement du fluide à travers le tuyau ne soit interrompu, en éliminant par aspiration du tuyau (2) un mélange de fluide et de débris, lesquels sont ensuite séparés du fluide; le fluide nettoyé et ainsi réinjecté dans le tuyau (2). Une unité de nettoyage (10) permettant d'appliquer le procédé selon l'invention décrite comprend un premier dispositif connectant l'unité de nettoyage au tuyau, un orifice (12) pour purger le gaz, une première vanne (14, 16), un ou plusieurs étages de séparation (18, 28, 38) permettant de séparer mécaniquement des débris du mélange de gaz/débris, un souffleur (40) permettant l'aspiration, une deuxième vanne (48) reliée en parallèle au souffleur (40), une troisième vanne (50, 54), et enfin, un second dispositif reliant l'unité de nettoyage au tuyau; tous ces éléments étant raccordés en série.

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