F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 55/26 (2006.01) F16L 55/38 (2006.01)
Patent
CA 2229771
An obstacle Monitoring Pig for preliminary inspection of a section of a pipeline travels through the section and determines if there are any restrictions that might damage other pigs that require the full bore of the pipe. A disk-shaped segmented resilient member 14 is mounted in the body of the pig. Its outside diameter is smaller by a spacing 21 than the inside diameter of the pipeline 15. The spacing is set at the maximum tolerable size of the obstacle encountered. The displacement of the member 14 is transmitted to a switch system activating the indication of an obstacle having been encountered. A non-resiliently deformable checkup disk 19 is provided at the rear end of the pig, to double check that a no-signal passage through the pipe is not due to failure of the switching system. The device is structurally simple thus providing low manufacturing and operation costs and simple operation.
Gowling Lafleur Henderson Llp
Savard Donald D.
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