Nature of business Jahre Group AS is a marine service and gas technology company. The company has patent protected the concept for marine LNG tanks in several countries. The classification society Det Norske Veritas (DNV) has completed the process for issuing an "Approval in Principle" for the Jahre Group AS LNG Tank concept. The principle of the concept is accepted by DNV and an "Approval in Principle" issued. Jahre Group AS will now marked the LNG Tank concept internationally for shipping- and offshore companies.