Posted by Owen Aaland on March 27, 2014 at 19:38:24 from (216.47.34.188):
In Reply to: NATURAL GAS BUS posted by George Marsh on March 26, 2014 at 09:16:17:
At atmospheric pressures propane will boil at about -42°. If contained in a pressure vessel the pressure will rise with the temperature until about 208° F at which point the pressure will increase very rapidly with a rise in temperature. The relief valve on most tanks is set at 250 psi which is good for about 130°.
All internal combustion engines run on vaporized fuel whether it is diesel, gasoline, propane, or natural gas. Part of the job of the diesel fuel injector is to atomize the fuel as it enters the cylinder. Gasoline or liquid propane injectors perform the same function.
Natural gas engines can use either compressed natural gas (CNG) or liquid natural gas (LNG). CNG systems use much higher pressures than LPG. LNG systems can store much more fuel in the same size tank as compared to CNG but the fuel tanks must be well insulated since the fuel is cooled to -260° F to condense it to liquid form. The LNG system uses the cooling affect of boiling LNG to maintain the temperature. As a result there is always some fuel loss with a LNG system.
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