A pipeline operating company with an 8,000 mile liquid petroleum distribution system reviews the costs and results of the past ten-year, internal inspection program. A comparison of total inspection and repair costs and repair rates are presented for twenty mainline sections. Comparisons are also made for five different internal inspection contractors and for inspection tools of the first and second generation. The effects of cost in comparison to pipeline length, coating condition, and the location of a line in urban or rural environments are analyzed. The effects this program has had on the number of corrosion leaks are also analyzed. Also, a conclusion is made as to the program’s impact on pipeline integrity.

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