MOSCOW, July 29 (Reuters) – Russia’s idled primary oil refining capacity was revised up to 2.591 million tonnes in August, up 34% from the previous estimate, sources citing refinery maintenance data and Reuters calculations showed on Friday. The offline primary oil refining capacity data for July was also revised up by 1.6% to 3.274 million tonnes. The revisions follow several changes to Russian oil refinery maintenance schedules.