Speed controlled pig

Details Speed controlled pig Speed controlled pig

F - Mech Eng,Light,Heat,Weapons

16

L

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

Patent

CA 2162424

A speed controlled pig for use in a pipeline has an essentially hollow housing through which gas or other pipeline liquids can flow from the rear of the housing, through the housing and subsequently out of the housing. A first bonnet, having several openings, is mounted at the front of the housing on a shaft which is oriented parallel to the longitudinal axis of the housing. A second bonnet is mounted on the housing and fits over the first bonnet. The second bonnet has openings which, when aligned with the openings in the first bonnet, permit the flow of pipeline fluids out of the housing. The first bonnet is movable in relation to the second bonnet so as to vary the degree of alignment of the openings in the bonnets. By varying the degree of alignment of the openings in the bonnets, the flow of liquids through the housing is regulated so as to control the speed of the pig. A control module is located in the interior of the housing for controlling the operation of the pig.

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