A sulfuric acid spill that lasted for 2.5 hours at Tesoro's refinery in Martinez, Calif., was caused by a pipe fitting that hadn't been tightened, according to a report released by the U.S. Chemical Safety Board. "This incident highlights the need for strong process safety management at facilities that ensures mechanical integrity is verified prior to the introduction of hazardous chemicals into equipment," said CSB chairman Rafael Moure-Eraso.

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