Speed regulated pipeline pig

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

Patent

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Details

F16L 55/38 (2006.01) B08B 9/055 (2006.01) F16L 55/28 (2006.01)

Patent

CA 2729330

A pipeline pig includes a venturi and a modulating valve located rearward of the inlet side of the venturi. When the valve is in the open position, a predetermined maximum bypass flow is allowed through the venturi. The closed position allows a predetermined minimum bypass flow. The valve may be a poppet-style valve or a frusto-conical shaped stopper. The stopper has sufficient mass and/or aerodynamic drag to overcome the spring force holding the valve in the open position. When the pig stalls, the valve closes and the stopper chokes bypass flow through the venturi. When the pig starts running again, the valve opens as in-ertia forces the stopper away from the inlet side of the venturi. Also, as friction of the pig increases due to changes in the internal diameter of the pipeline or accumulation of debris ahead of the pig, increased airflow across the valve creates drag.

L'invention concerne un racleur de pipelines comprenant un venturi et une soupape de modulation située en arrière du côté admission du venturi. Lorsque la soupape est en position ouverte, elle laisse passer un débit maximal prédéterminé de dérivation à travers le venturi. La position fermée laisse passer un débit minimal prédéterminé de dérivation. La soupape peut être une soupape de type champignon ou un obturateur de forme tronconique. L'obturateur présente une masse et / ou une traînée aérodynamique suffisantes pour vaincre la force du ressort maintenant la soupape en position ouverte. Lorsque le racleur se coince, la soupape se ferme et l'obturateur restreint le débit de dérivation à travers le venturi. Lorsque le racleur redémarre, la soupape s'ouvre car l'inertie écarte l'obturateur du côté admission du venturi. En outre, à mesure que le frottement du racleur augmente du fait de variations du diamètre intérieur du pipeline ou de l'accumulation de débris en avant du racleur, un débit d'air accru à travers la soupape crée une traînée.

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