A liquid hydrogen tank car, also called liquid hydrogen tank wagon or liquid hydrogen tanker wagon is a railroad tank car designed to carry cryogenic liquid hydrogen (LH2). LH2 tank cars with a capacity of 17,000 pounds (7,711 kg) are used for transcontinental transport.
The pressure within the tank is 25 psi (170 kPa) or lower with a temperature below 20.27 K (−423.17 °F or −252.87 °C) and a boil-off rate of 0.3% to 0.6% per day The tank is double walled like a vacuum flask with multi-layer insulation, with the valves and fittings enclosed in a cabinet at the lower side or end of the car.
Cryogenic liquid tank cars in the USA are classified as follows:
- DOT-113 tank cars (Cryogenic liquid tank cars)
- AAR-204W tank cars (Cryogenic liquid tank cars)
- AAR-204XT (Inside Box Car)
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