At least three of the nine U.S. oil refineries targeted by a nationwide strike of United Steelworkers union members have reported upsets and unplanned repairs since their workers walked out earlier this month. Royal Dutch Shell Plc’s Deer Park refinery in Texas had an upset at a fluid catalytic cracker on Feb. 8. Tesoro Corp.’s Carson plant near Los Angeles performed unscheduled repairs after a unit breakdown. Marathon Petroleum Corp.’s 451,000-barrel-a-day Galveston Bay refinery in Texas, the biggest of the plants on strike by capacity, leaked diesel from an ultracracker. The equipment failures are occurring amid the biggest strike of U.S. oil workers since 1980. United Steelworkers union members have walked out of nine U.S. refineries since Feb. 1 that account for about 13 percent of the country’s processing capacity. One of the sites affected has halted production, and a full strike of USW members would threaten […]