BP workers, in the background, remove insulation from an oil transit pipeline at the Prudhoe Bay oil field on Alaska's North Slope Aug. 18, 2006 as other workers use ultrasound to test for weakness in the pipe due to corrosion. BP PLC on Thursday, Nov. 4, 2010, said internal "F" ratings of pipeline sections it operates in Alaska's North Slope are signs the company's corrosion monitoring program is working and not an indicator of failure. BP spokesman Steve Rinehart was responding to a report by the independent investigative news organization ProPublica that says the rating means the pipeline walls are 80 percent corroded and could rupture. (AP Photo/Al Grillo)
Read the article: BP defends 'F' ratings on Alaska oil pipelines
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