Pipeline pig

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

Patent

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Details

F16L 55/38 (2006.01) B08B 9/04 (2006.01) F16L 55/165 (2006.01) F16L 55/40 (2006.01)

Patent

CA 2488936

A pipeline pig (1), and method for installing a liner into a pipework, the pipeline pig comprises longitudinal inner (7) and outer (6) walls, and end walls (10, 12), said inner and outer walls being of substantially annular arrangement in transverse section, the pipeline pig being such that, in use, space enclosed by said walls is filled with fluid, and when a pressurising fluid is applied to the rearward end of the pipeline pig the pig advances through the pipeline by way of substantially radial portions of the walls moving in respective endless loops. The pipeline pig exerts a radially outward pressure to a liner (16) so as to urge said liner against an inner surface (40) of the pipework. The inventive pipeline pig can also be used to clear unwanted material from a pipework.

L'invention concerne un racleur (1) ainsi qu'un procédé d'installation d'une crépine dans une conduite. Ce racleur comprend des parois intérieure (7) et extérieure (6) longitudinales ainsi que des parois d'extrémité (10, 12), la coupe transversale desdites parois intérieure et extérieure montrant un dispositif sensiblement annulaire. Les caractéristiques du racleur font que, au cours de son utilisation, l'espace délimité par lesdites parois est rempli de fluide, et, lorsqu'un fluide sous pression est appliqué à l'extrémité arrière du racleur, ce dernier avance dans le pipeline sous l'effet du déplacement en boucles respectives de certaines parties sensiblement radiales des parois. Ce racleur exerce une pression extérieure radiale sur la crépine (16) pour la pousser contre la surface intérieure (40) de la conduite. Ce racleur peut être également utilisé pour éliminer les matières indésirables d'une conduite.

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