Oct. 22 (Bloomberg) -- Citgo Petroleum Corp., the U.S. refining subsidiary of Venezuela's state oil company, is carrying out three days of maintenance at its Corpus Christi, Texas, refinery, according to a Texas Web site.

The maintenance, which requires repairs and testing on a unit linked to a boiler stack, begins at 4 a.m. local time today until 4 a.m. on Oct. 25, the company said in a filing to the Texas Commission on Environmental Quality.

The refinery is located about 235 miles (378 kilometers) southwest of Houston, and is the smallest of three the company operates in the U.S. The Corpus Christi refinery has a processing capacity of 156,000 barrels of oil a day.

To contact the reporter on this story: Nidaa Bakhsh in London at nbakhsh@bloomberg.net;

Last Updated: October 22, 2007 05:35 EDT