Smart pigging vital to operation of Texas, Northwest pipeline. D. King. Pipeline Gas J., March 1999, 226(3), 14--21.

Operations of a gas transmission company in Texas and the Pacific Northwest are described. 10 000 miles of pipeline transport 6 billion ft3/day and a 500 mile network carries 100 000 brl/day of natural gas liquids to 9 natural gas processing plants. Smart pigs use magnetic flux leakage inspection tools to determine the physical condition of 8 to 36 in. diameter pipelines. A typical pig for 36 in. lines is 13.7 ft long and weighs 7035 pounds. Before launching the smart pig the line is cleaned of debris and a dummy pig is run to ensure that sticking will not damage the expensive equipment.

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