National Oilwell Varco is a premier designer and builder of large marine cranes. This includes the world’s largest fleet of cranes, rated at over 7000 U.S. tons. National Oilwell Varcos AmClyde™ revolving cranes a......National Oilwell Varco is a premier designer and builder of large marine cranes. This includes the world’s largest fleet of cranes, rated at over 7000 U.S. tons. National Oilwell Varcos AmClyde™ revolving cranes are the largest in the world, holding virtually every offshore marine lifting record in existence. FEATURES: Boom lengths are designed to meet customer specific requirements. Cranes are available as diesel/hydraulic, electric/hydraulic, diesel/electric, and electric powered. Gantry height is designed to suit individual requirements. Special configurations include fixed over-stern and tie-back lifting capacities. Cranes can be certified with ABS, BV, DNV, Lloyds and RINA.