Trans Alaska pipeline restarted after maintenance

* Alaska resumes oil flows after 36 hours of work

* 2nd summer maintenance planned July 31-Aug. 1

CALGARY, Alberta, June 21 (Reuters) - Alyeska Pipeline Service Co said it restarted the Trans Alaska crude oil pipeline late on Sunday after 36 hours of scheduled maintenance.

The operator of the 800-mile (1,280 km) line worked on five pumping stations as well as the Valdez, Alaska, marine terminal.

Trans Alaska will be shut down for upkeep again on July 31 and Aug. 1, a period that coincides with maintenance work planned by Alaska North Slope oil producers, the company said.

The line is owned by BP (BP.L: Quote), ConocoPhillips (COP.N: Quote) and Exxon Mobil (XOM.N: Quote), as well as two smaller companies.

The Trans Alaska line is the artery shipping North Slope crude oil to Valdez for loading onto tanker vessels. Daily flow through the pipeline has averaged 651,380 barrels so far in 2010, according to Alyeska. (Reporting by Jeffrey Jones; editing by Peter Galloway)