Maintenance and repair workers at Aberdeenshire's St Fergus Gas Terminal are being balloted over possible strike action.
Unite the Union has confirmed that more than 100 Kaefer maintenance and repair contractors based at the Mossmorran plant and the St Fergus Gas Terminal will vote between 11 and 25 October.
The Mossmorran site in Fife and the St Fergus near Peterhead and Fraserburgh are natural gas liquid (NGL) plants operated by Shell.