Method and apparatus for pushing a dual diameter pig into a...

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

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F16L 55/46 (2006.01)

Patent

CA 2516575

An apparatus for pushing a dual diameter pig through a conical reducer attached to a pig trap and into a pipeline includes a frame configured such that the pig rests and moves forward on the frame, which has a front end adapted for attachment to the trap. The vertical position of the frame can be adjusted to align the pig with the conical reducer. An actuator is supported on the frame rearward of, and aligned with, the pig and an actuator control extends the actuator into contact with the rear end of a pig, and also retracts the actuator. The actuator locks to the frame at lock locations spaced along the frame, and the lock locations are separated by a distance that is less than a stroke of the actuator. The pig is pushed into the trap in steps by repeatedly extending, retracting, and moving the actuator forward.

Il s'agit d'un appareil qui pousse un racleur de double diamètre à travers un réducteur conique fixé à une gare à racleurs, et dans un pipeline, comprend une structure configurée de telle sorte que le racleur repose et avance sur la structure qui a une extrémité avant adaptée à la fixation à la gare. La position verticale de la structure peut être réglée pour aligner le racleur avec le réducteur conique. Un vérin est soutenu sur la structure vers l'arrière du racleur, et aligné avec lui, et une commande de vérin sort le vérin au contact de l'extrémité arrière d'un racleur et rentre également le vérin. Le vérin se verrouille sur la structure aux endroits de verrouillage espacés le long de la structure, et ces endroits de verrouillage sont séparés d'une distance inférieure à une course du vérin. Le racleur est poussé dans la gare par étapes, en sortant, rentrant et avançant le vérin à plusieurs reprises.

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