MOSCOW, Jan 11 (Reuters) - The Yamal-Europe pipeline, which usually sends Russian gas west into Europe, instead flowed east from Germany to Poland for the 22nd day on Tuesday, data from German network operator Gascade showed.

Since Dec 21 the link between Poland and Germany had been operating in reverse mode, carrying gas from west to east and putting upward pressure on European gas prices.

The pipeline accounts for about one sixth of Russia's normal annual gas exports to Europe and Turkey.

Eastbound volumes stood at around 7 million kilowatt hours an hour (kWh/h) and are expected to remain in reverse with the same volumes until early hours on Wednesday, data from the Mallnow metering point on the German-Polish border showed.

It is not clear when the pipeline will change the flows back towards Germany though a source close to Gazprom said the company is expected to switch flows back at some point this month, as Gazprom has paid for westbound volumes. (Reporting by Katya Golubkova; editing by Jason Neely)