A refrigerated transport Dewar is a refrigerated transport vessel with an insulated Dewar flask (vacuum) design to carry cryogenic liquid.
To prevent pressure build-up they are equipped with safety relief valves and/or rupture discs.
[1] A non refrigerated air-transportable dewar for 750 liters of liquid hydrogen was developed by H.L.
[2] The heat flow to the liquid hydrogen shell was 4 watts, boil-off about 7.5 liters per day, or 1% of the rated capacity.
It was placed on a 10.7-meter semi-trailer and weighed 18.1 metric tons, including a diesel generator for refrigerator operation away from electric power lines.