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The outage at the field, caused by maintenance on a compressor, started at 2310 GMT on Friday and is now expected to last for 40 hours versus the previously estimated 18-20 hours, Gassco added.
Gassco also said an outage on BP's Skarv field, cutting the country's gas output by 10.9 mcm/day, was extended until Tuesday. Its restart has been delayed several times, and the duration of the outage is still unknown, it said.