A maintenance outage at Norway's Nyhamna gas processing plant will take at least a month longer than anticipated due to problems with the plant's cooling system, plant operator Shell Plc. (NYSE:SHEL) has said. Shell has stopped all non-essential work after discovering a gas formation with hydrogen, terming the situation ‘‘complex’’. Located in North-western Norway, the Nyhamna gas processing plant processes gas from the Ormen Lange and Aasta Hansteen fields. With 79.8 million cubic meters (mcm)…