Refrigerated hydrocarbon and non-petroleum based liquefied gaseous fuels. Metering of gas as fuel on LNG carriers during cargo transfer operations|Petroleum products, Liquefied petroleum gas, Liquefied natural gas, Water transport engineering, Ships bodies, Hull compartments, Marine transport, Freight transport, Cargo ships, Tankers, Ships, Prismatic shape, Tanks (containers), Membranes, Liquefied gases, Aliphatic hydrocarbons, Refrigeration, Calibration, Volume measurement, Dimensional measurement, Liquid-level measurement, Safety measures, Test equipment, Testing conditions, Errors, Mathematical calculations, Error correction