Husky Energy plans to shut down a catalytic cracker at its 155,000-barrel-per-day (bpd) refinery in Lima, Ohio, for up to three weeks, according to two sources familiar with the facility.

The shutdown of the 40,000-bpd catcracker, which produces gasoline, will also result in limited production in other units at the refinery, the sources said.

They did not know, however, whether the work on the catcracker was unexpected or planned months ahead of time, as is common with refinery maintenance projects.

Mel Duvall, a Husky spokesman, said that there is no planned work at the refinery.

An industry source previously told Reuters that the Calgary-based company is planning a refinery-wide shutdown on October 1, 2015, for up to 40 days to increase the amount of heavy crude it can process. The revamp is part of a plan announced by Husky last year to increase the amount of heavy crude it can process at the refinery.

Since 2012, the Lima refinery has processed over 60,000 bpd of Canadian crude, but only about 3,000 bpd of that would be particularly heavy with an API gravity below 30, according to US government data. Husky Energy reported an 11.5 per cent rise in quarterly profit, helped by a 10 per cent increase in production.

Canada’s No3 integrated oil company, controlled by Hong Kong billionaire Li Ka-shing, said total production rose to 341,000 barrels of oil equivalent per day (boepd) in the third quarter ended September 30, from 309,000 boepd a year earlier.