By Ben Winkley

LONDON--Workers at Scotland's Grangemouth refinery have voted to strike, raising the prospect of disruption to North Sea crude-oil supply.

Should the strike go ahead then the 210,000 barrels-a-day facility, Scotland's only refinery, would be forced to shut. A key piece of infrastructure, the facility also powers and is the terminal for the Forties Pipeline System, a key conduit for around one-third of North Sea crude. Grangemouth is also connected to an import terminal on Scotland's west coast.

Unite, the U.K. biggest labor union, said that on an 86% turnout some 90.6% of workers voted for industrial action short of a strike, with 9.4% voting against, while 81.4% voted for strike action and 18.6% voted against. The dispute is over the treatment of a labor union representative.

Grangemouth is jointly owned by Ineos Group Holdings and PetroChina Co. Ltd. (PTR). Neither were immediately available for comment.

Write to Ben Winkley at ben.winkley@wsj.com

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