BEIJING (Reuters) - PetroChina's newly launched oil pipeline running from northwest to central China is running normally after the company shut off a branch line that spilled diesel into a river last week, company officials said on Monday.

PetroChina switched off the Weinan branch line in northern Shaanxi province last Wednesday, following a leak of 150,000 liters of diesel into a river that has been largely contained.

The new branch line is part of the 1,188 km pipeline that pumps fuel from PetroChina's refining center in Lanzhou, northwestern Gansu province, to Zhengzhou in central China's Henan province, which started operations last March.

"There has been no impact on supplies. Volumes being pumped through the trunk line have been very sporadic anyway because of weak demand and competing train transport," said an official familiar with the pipeline's operations.

PetroChina plans to extend the trunk line to Changsha, Hunan province, with an annual supply capacity of 300,000 barrels per day, one of the country's largest by capacity.

(Reporting by Chen Aizhu; Editing by Chris Lewis)