The world's largest membrane type liquefied natural gas carriers are the Q-Max ships. They have a gross tonnage of 162,400 GT and span 345 m (1,132 ft) in length. The Q-max ships have a capacity of 266,000 cubic meters (9,393,701 cubic feet) and travel at 19.5 knots (36.114 km/h, 22.4 mph).