High natural gas content of the North Sea oil-producing fields has long been regarded as a valuable asset by which the cost of offshore oil recovery could be improved. None of the production platforms in the British North Sea concessions were originally built with provisions for handling natural gas other than by burning it. Pressure from the U. K. government to reduce the gas flaring has forced oil companies to invest in pipelines to move the gas to land. The Far North Liquids and Associated Gas System Pipeline, or FLAGS, was laid to gather gas from the East Shetland oil fields and bring it ashore to Scotland at St. Fergus. Its most northern point is the Brent Field operated by Shell, which also operates FLAGS. Associated with the Northern Leg Gas Pipeline system are a number of ball valves that are installed for platform protection and operational flexibility.