At the start of December, operator Ineos revealed the system would have to be closed after engineers discovered a small hairline crack in the pipe at Red Moss near Netherley.
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The Forties pipeline carries crude North Sea oil across sea and land for processing at Grangemouth, supplying around 40% of the UK's North Sea oil and gas production.
Following the repairs, the system is now fully operational and the Ineos facility at Kinneil has restarted.
Ineos said: "We apologise to our customers and the local community for the issues that the pipeline closure has created."
(LM/MH)
