A dispute over working hours and work sites at Statoil's Kårstø complex north of Stavanger is due to come to court on Monday.
The claim being pursued by the Norwegian Oil and Petrochemical Workers Union (Nopef) and the Norwegian Petrotechnical Union against Statoil as the employer will be heard by the Karmsund municipal court.
At issue is the question of when working time should be considered to have started at the Kårstø facility. The two unions argue that work starts when employees pass the gate into the plant, while Statoil contends that it first begins with they reach their work stations.
The court hearing is expected to last four days.