Pipeline engineering experts, STATS Group, has completed an isolation project on behalf of AMEC to allow maintenance and replacement works on the North Everest platform in the central North Sea. The workscope covered three maintenance valves and one ESD valve on a 20-inch gas import line onboard the BG-operated platform. After a detailed site survey and piggability study, STATS decided the best solution was to use a tethered Tecno Plug pushed by stem bar to location from a temporary launcher.