Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1984-06-11
1987-12-22
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
1510463, 33363K, 250231R, 324 67, 324207, 324260, 34081524, 34081529, G01V 308, G01R 3302, G08B 500
Patent
active
047148888
ABSTRACT:
A device to give an indication of the passage of a pig through a pipeline and methods of performing various pipeline operations using the device are described. The device has a magnetic sensor based on a dip needle and the output of the sensor controls a flag actuating mechanism. Passage of a pig beneath a pig indicating device causes a flag to be raised giving a visual indication that the pig has passed that location. Methods are described in which one or more devices are used to find a lost pig, for accurately locating a defect in a pipeline, for determining if a pig has been correctly launched or received, and for determining and controlling the speed of a pig in a pipeline.
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French Hartley A.
Richardson Anthony C.
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