At cryogenic temperatures of –162°C at normal pressures, natural gas condenses into Liquefied Natural Gas (LNG). LNG takes up only 1/600 of the volume of natural gas and is therefore much easier to transport. Transportation of LNG is a good alternative when a pipeline is not feasible, such as across vast oceans to key consumer markets. However, constant boil-off from the LNG in tanks and vessels must be either recycled for re-liquefaction or potentially even used as fuel for the vessels transporting the LNG. Ultrasonic gas flow meters from SICK allow a precise and reliable fiscal metering of the boil-off losses even at cryogenic temperatures.