The pipeline inspection gauge (PIG) alert system provides a method and apparatus for effectively locating a pipeline inspection gauge (PIG) as it traverses a pipeline. The method and apparatus incorporates hollow, empty tubes spaced along the length of the pipeline. The tubes are provided with lower
The pipeline inspection gauge (PIG) alert system provides a method and apparatus for effectively locating a pipeline inspection gauge (PIG) as it traverses a pipeline. The method and apparatus incorporates hollow, empty tubes spaced along the length of the pipeline. The tubes are provided with lower ends that extend into the pipeline. The tubes are closed at their lower ends and connectable to respective pressure detection devices or the like at their upper ends. When a PIG passes through the pipeline, it contacts the lower end of the tube that extends into the pipeline, causing the tube to break, and thus opening the interior of the tube to the pressurized flow of the product flowing in the pipeline. The change in pressure is registered by the pressure detection device to indicate the passage of the PIG.
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1. A pipeline inspection gauge (PIG) alert system for detecting the location of a pipeline inspection gauge in a pipeline, the system comprising: a plurality of tubes adapted for being positioned at spaced intervals along the length of the pipeline, each of the tubes having a lower end and an upper
1. A pipeline inspection gauge (PIG) alert system for detecting the location of a pipeline inspection gauge in a pipeline, the system comprising: a plurality of tubes adapted for being positioned at spaced intervals along the length of the pipeline, each of the tubes having a lower end and an upper end, the lower end of each tube being adapted for extending into the pipeline, wherein each said tube has an exterior surface, the exterior surface being scored adjacent the lower end to facilitate breaking said tube adjacent the lower end; andmeans for detecting a change in pressure in each of the tubes, the means for detecting being disposed on the upper end of each of the tubes. 2. The pipeline inspection gauge (PIG) alert system according to claim 1, wherein the lower end of each said tube is closed and the upper end is open, said means for detecting being disposed in and sealing the upper end of said tube. 3. The pipeline inspection gauge (PIG) alert system according to claim 1, wherein each said tube is fabricated from plastic material. 4. The system for detecting the location of a pipeline inspection gauge in a pipeline according to claim 1, wherein said means for detecting pressure is a pressure gauge. 5. A system for detecting the location of a pipeline inspection gauge (PIG) in a pipeline, comprising: a plurality of hollow, plastic tubes adapted for being positioned at spaced intervals along the length of the pipeline, each of the tubes having an interior, a closed lower end and an open upper end, the closed lower end of each of the tubes being adapted for extending into the pipeline; anda plurality of pressure gauges for detecting changes in pressure in the interior of each of the tubes, each of the tubes having a corresponding one of the pressure gauges disposed at the upper end of the tube, each of the tubes being frangible adjacent the lower end so that the PIG breaks the lower end of the tube upon impact, the pressure gauge showing a change in pressure of fluid in the pipeline. 6. The system for detecting the location of a pipeline inspection gauge in a pipeline according to claim 5, wherein each said tube has an exterior surface, the exterior surface being scored adjacent the lower end, said tube being frangible at the score line. 7. A method of detecting the location of a pipeline inspection gauge (PIG) in a pipeline having a product flow therein, comprising the steps of: launching the pipeline inspection gauge in the pipeline, the pipeline inspection gauge being propelled by pressure of the product flow;positioning tubes along the length of the pipeline, each of the tubes having an upper end, a closed bottom end, and a hollow interior, the closed bottom end extending into the pipeline, each of the tubes being frangible adjacent the bottom end and having a pressure gauge disposed in the upper end, whereby the tube breaks adjacent the bottom end upon impact by the PIG traveling in the pipeline, exposing the interior of the tube to the pressure of the product flow;detecting a change in pressure within the interior of the tube caused by the pressure of the product flow, as indicated by the pressure gauge; anddetermining the location of the PIG in the pipeline by a change in the pressure indicated by the pressure gauges as the PIG travels through the pipeline.
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이 특허에 인용된 특허 (7)
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