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good evening. i m julie haener and this is second. gas line explosion earlier this month, investigators have focused on the 30 steel pipe that made up the pressurized line. people in the oil and gas industries have long known that steel pipes, especially older, uncoded ones can corrode and eventually rupture. four years ago, bp found coercion in its pipeline in alaska and it to shut it down for repares. here is ktvu s health and science editor john fowler from 2006. reporter: bp says it found 16 miles of pipeline so severely corroded it could take months to repair. only when we re absolutely satisfied that those lines are in good condition, will we bring those back into service. reporter: bp acknowledges that it hadn t clean out its aging pipes in at least 14 years, saying it didn t appea to be necessary. the industry standard is every few months. a bp leak and spill in alaska earlier this year sparked a criminal investigation. experts say corroded pipes should have be