PetroRabigh said Wednesday it's third quarter net loss widened by 18 percent as maintenance work at the refinery cut sales. The joint venture of state-owned oil company Saudi Aramco and Japan's Sumitomo Chemical reported a net loss of SR280.6 million ($74.81 million) for the period ended Sept. 30. That compares to 237.2 million riyals in the prior-year period. “The reason for the increase in net loss in the third quarter, compared to the same quarter of the previous year, is due to the extension of the periodical maintenance until Aug. 15, 2011, when all facilities became fully operational,” PetroRabigh said. PetroRabigh started operations at its $10.1 billion complex in 2009.