Husky and BP's Toledo, Ohio refinery shuts cat cracking unit for a week- source

(Updates with no comment from BP)

NEW YORK, Jan 27 (Reuters) - A fluid catalytic cracking unit at BP Plc and Husky Energy (Toronto: HSE.TO - news) 's Toledo, Ohio, refinery is expected to be shut for a week after a component tripped, according to a person familiar with the plant.

The 55,000-barrel-per-day unit was shut after something tripped, the person said. Efforts were underway to increase production at the plant while Husky's refinery in Lima, Ohio, was at reduced rates following a fire, the person said.

A BP spokesman declined to comment on the unit's operations.

Persistent, excess emissions and localized cooling have been observed since 3:51 a.m. EST, according to Genscape, an energy industry information service. (Reporting by Jarrett Renshaw; Editing by Jessica Resnick-Ault, Chris Reese and Dan Grebler)