Leak sealing apparatus

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

Patent

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Details

F16L 55/162 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2707179

The present invention relates to apparatus comprising one or more sealing elements (20) to be transported along a duct (24) by the flow of fluid therein at an internal pressure and to be drawn to a leak (22) by the pressure differential resulting from a reduced pressure associated with the locality of that leak. Each sealing element comprises a body formed from an elastic material to have one or more impermeable bubbles filled with gas so that the sealing element has a volume which varies resiliently according to the change in volume of the bubble (s) in response to externally applied pressure. The product of the volume of the bubble (s) and the pressure of the gas therein is selected to provide a sealing element having a transport volume at said internal pressure which is appropriate to enter a leak and which, in response to the reduced pressure associated with the locality of that leak, is capable of increasing in volume from said transport volume sufficiently to seal that leak.

La présente invention concerne un appareil comprenant un ou plusieurs éléments de scellement (20) devant être transportés le long d'une conduite (24) par le biais de l'écoulement de fluide à l'intérieur de celle-ci, à une pression interne, et devant être amenés jusqu'à une fuite (22) grâce au différentiel de pression résultant d'une pression réduite associée à l'emplacement de ladite fuite. Chaque élément de scellement comprend un corps formé d'un matériau élastique, de façon à avoir une ou plusieurs bulles imperméables remplies de gaz, de sorte que l'élément de scellement ait un volume qui varie de manière résiliente selon le changement de volume de la ou des bulles, en réponse à la pression appliquée extérieurement. Le produit du volume de la ou des bulles et de la pression du gaz à l'intérieur est choisi de façon à fournir un élément de scellement ayant un volume de transport à ladite pression interne qui est approprié pour entrer dans une fuite et qui, en réponse à la pression réduite associée à l'emplacement de ladite fuite, est capable d'augmenter suffisamment son volume, par rapport audit volume de transport, pour sceller cette fuite.

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