US probe cites "ineffective" safeguard in Husky oil refinery blast

MOSCOW (MRC) -- An "ineffective" safeguard failed to prevent an explosive mixing of air and fuel at a Husky Energy refinery in Superior, Wisconsin, leading to a blast and fire in the plant's gasoline-producing unit in April, a US industrial safety group said, reported Reuters.Air seeped through a hole in a valve within a fluidic catalytic cracking unit (FCCU), the US Chemical Safety Board

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