WARSAW (Reuters) - Polish pipeline operator PERN confirmed that clean oil supplies from Russia had been partially restored on Sunday after Russia’s oil export flows to Europe were disrupted in April because of contamination.

Belarus state energy company Belneftekhim earlier said that it had partially resumed oil transit toward Poland and that its daily Western-bound transit plan for June was 65,000 tonnes.

PERN said that normal volumes of oil are expected in July.

The company’s clients include two Polish refineries - one in Gdansk, owned by Lotos, and one in Plock, controlled by PKN Orlen, plus two plants in Germany.

State-run PKN and Lotos have relied on seaborne oil supplies and existing inventories to keep their refineries working during the suspension of Russian deliveries.

On Sunday PKN and smaller rival Lotos said the suspension of Russian supplies had no impact on their refineries’ output.

In May Moscow agreed to pump dirty crude back from Belarus to clear the affected pipeline. Refineries in Poland and Germany agreed to process the dirty oil sitting in pipelines west of Belarus.

Russian officials and oil suppliers met European buyers in Moscow this month and decided that compensation for the contamination of Russian oil in the Druzhba pipeline should be agreed between buyers and sellers.

PKN Chief Executive Daniel Obajtek was quoted as saying on the website of private radio RMF on Sunday that PKN will calculate the exact amount of its claims in the next few days.