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Title: Magnetic Inspection Pigging As An Aid To Pipeline Maintenance
Author: W. m. Holm
Source: American Gas Association 1984
Year Published: 1984
Abstract: Magnetic inspection pigging plays an important part in the maintenance of mainUnes and gathering systems at Natural Gas PipeHne company. Since 1968, over 2100 miles of pipeline have been surveyed with the same objective to verify the integrity of the system and determine where repairs or recoating are needed, Natural Gas Pipeline Company has two mainline systems (Figure 1). The Amarillo System carries gas from the Texas Panhandle and surrounding area to the Chicago area its original 24 line was constructed in 1930. The Gulf Coast System from the Texas and Louisiana coastal area originated with a 30 line in 1951, Both systems now have multiple loop lines and extended gathering systems. Hydrostatic testing of the lines during construction did not commence until 1965, so in 1968 Natural started a program of hydrostaiically testing the older lines. At that time magnetic inspection pigging was a new technique available for locating pipe wall metal loss.

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