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New DNV GL Notations for Water-lubricated Tail Shafts

Two new tail shaft monitoring class notations from DNV GL offer ship owners and operators the possibility of unlimited intervals between tail shaft withdrawal surveys for water-lubricated systems. With these two voluntary class notations, TMON (closed loop water) and TMON (open loop water), DNV GL becomes the first classification society to use a condition-monitoring based survey process that eliminates the requirement for tail shaft withdrawal surveys at predetermined intervals.