The maintenance requirements and limitations of blowout preventers, or BOPs, on oil wells in the Gulf of Mexico are still broadly misunderstood in the industry four years after the massive BP spill, according to a report by the U.S Chemical Safety and Hazard Investigation Board. As a result, another catastrophe remains a possibility, the report says as its calls for separate testing of every system in each BOP so that the success of one doesn't obscure the failure of another.

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