A yearend deadline for installing emergency shutdown valves (ESVs) on most platform risers in the U.K. North Sea has turned the normal summer maintenance period into one of the most active ever in British waters. The ESVs are required by legislation introduced after the July 1988 Piper Alpha explosion and fire. They will be installed in addition to the normal weather window inspection and maintenance work. A number of operators have started to install subsea isolation valves. U.K. Offshore Operators Association estimates companies will spend 360 million ($650 million) on valve installation. Production normally drops du...

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