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.[1][2]

Design

The pressure within the tank is 25 psi (170 kPa) or lower[3][4] 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[5] 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.

Classes

Cryogenic liquid tank cars in the USA are classified as follows:[6]

  • DOT-113 tank cars (Cryogenic liquid tank cars)[7]
  • AAR-204W tank cars (Cryogenic liquid tank cars)[8]
  • AAR-204XT (Inside boxcar)

See also

References

  1. ↑ "Toward a liquid hydrogen fuel economy-Pag.9" (PDF). deepblue.lib.umich.edu. Retrieved 2015-04-06.
  2. ↑ . deepblue.lib.umich.edu http://deepblue.lib.umich.edu/bitstream/2027.42/5800/4/bac5758.0001.001.txt. Retrieved 2015-04-06. {{cite web}}: Missing or empty |title= (help)
  3. ↑ Cryogenic rail tank cars Pag.3
  4. ↑ Spencer, A.B.; Colonna, G.R. (2003). NFPA Pocket Guide to Hazardous Materials. National Fire Protection Association. p. 59. ISBN 9780877655589. Retrieved 2015-04-06.
  5. ↑ "Costs of storing and transporting hydrogen Pag.50" (PDF). www1.eere.energy.gov. Retrieved 2015-04-06.
  6. ↑ "Field guide to rail cars". Archived from the original on 2008-12-20. Retrieved 2015-04-06.
  7. ↑ "eCFR — Code of Federal Regulations | DOT113". ecfr.gpoaccess.gov. Archived from the original on 2012-04-02. Retrieved 2015-04-06.
  8. ↑ "Railroad tank car specification marking system" (PDF). henrycoema.org. Retrieved 2015-04-06.
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