A 72-foot shrimp boat was converted to use liquefied natural gas as a fuel. To maintain its liquidity, the LNG is stored at -260 degrees Fahrenheit in cryogenic tanks constructed on the principle of thermos bottles. The LNG requires warming to ambient conditions to be burned in the engine. Partial warming takes place in heat exchangers in the fishhold, where the fuel acts as a refrigerant to chill the catch. The conversion allows both main engine and generator to operate on either diesel fuel or LNG. Fuel efficiency is equal to or better than that of a diesel engine. The cost of the LNG has consistently been about half that of diesel fuel. Conversion costs can be repaid in one to two years, depending on current fuel prices. Because LNG emits vapors that are lighter than air and rise and vent to the atmosphere, it is claimed to be safer than gasoline, propane or diesel fuel, all of which emit heavier-than-air vapors.

  • Availability:
  • Supplemental Notes:
    • Journal article
  • Authors:
    • Acker Jr, G
    • Brett, C E
    • BELL, S
  • Publication Date: 1989-6

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Filing Info

  • Accession Number: 00658051
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM