Valero Energy Corp said its 85,000 barrel per day refinery in Ardmore, Oklahoma, was back at planned rates after a snag at its gasoline-making fluid catalytic cracking unit, reports Reuters.

"All units are back and there was no impact to production," said Bill Day, a spokesman for the company.

Day said a problem with an air blower before the Fourth of July weekend shut down the 26,000 bpd FCC unit and further electrical work caused a breaker problem, which took down several units.