The quality of crude arriving in Hungary and Slovakia on the southern arm of the Druzhba, or “Friendship”, pipeline meets set standards, Hungarian oil and gas company MOL told MTI on Thursday.
The company said it was conducting regular testing of oil at the entry points.
Refineries in Poland have suspended imports of oil from the pipeline because it was found to contain high levels of organic chloride, a material used to boost oil output which must be separated before shipment as it can destroy refining equipment.
MOL said it was aware of concerns about the quality of oil flowing through the northern section of the Druzhba pipeline.
MOL and Slovnaft, its Slovak subsidiary, are in talks with regulators and companies in charge of crude oil supply to the region, it added.