 One of the reasons for the pipeline failure was an insufficient level of corrosion inhibitor, a liquid which resists corrosion of pipeline by the corroding liquid, which is water.John Dingell read from an internal BP email that said budgetary constraints would force the end of a programme to inject corrosion inhibitor directly into the pipeline system.The process of injecting corrosion inhibitor directly into a pipeline, though costly, is much more effective than injecting in a process plant.