NEW YORK -(Dow Jones)- Exxon Mobil Corp. (XOM) says a compressor malfunction Friday at its oil refinery in Beaumont, Texas, resulted in flaring as emissions were routed to the plant's coker unit safety flare, according to a report to the Texas Commission on Environmental Quality.

The compressor went off line at around 8 a.m. CDT on Friday and refinery personnel immediately took action to restart it, the filing said.

On Thursday, Exxon Mobil spokeswoman Kathleen Jackson said Crude Unit B, a coker unit and associated units had returned to normal operations following several weeks of planned turnaround maintenance.

It is unclear whether Friday's compressor snag occurred at the recently restarted coker unit. An Exxon representative wasn't immediately available to comment.

The Beaumont refinery's total throughput capacity is rated at 345,000 barrels a day.

-By Rose Marton-Vitale, Dow Jones Newswires; 201-264-4185; rose.marton@dowjones.com