Planned work at Exxon's Billings refinery underway

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NEW YORK, April 13 (Reuters) - Planned work on units at Exxon Mobil's 60,000 barrel per day refinery in Billings, Montana is expected to last until the end of April, according to a state regulator.

The gasoline-making 22,000 bpd fluid-catalytic cracking unit was down several days due to plugging, the regulator said.

A company spokesman was not immediately available for comment. (Reporting by Janet McGurty; Editing by John Picinich)