Posted by Indiana Ken on February 15, 2020 at 18:10:23 from (66.249.235.188):
In Reply to: Natural gas posted by 37 chief on February 15, 2020 at 16:37:36:
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Natural gas is not like propane. I don't believe there would be any tractors operated on liquefied natural gas (methane). There are cars and over the road trucks that operate on compressed natural gas. The pressurized (aproximately 3000 Psi is common) tanks hold only gas, there is no liquid in the tanks. Natural gas is not easily liquefied as is propane. To liquefy natural gas it must first be cooled to it's critical temperature, minus 117 degrees F. Then it must be pressurized to it's critical pressure, 668 Psi. Now you can begin the liquefication process. As if that is not a big enough problem, the liquid must be maintained in a cold state. Natural gas begins to boil at minus 259 degrees F, at 100 degrees F the vapor pressure will be approximately 5000 Psi.
In comparison propane is easily liquefied and has a vapor pressure of 190 Psi at 100 degrees F.
Natural gas is obtained similar to crude oil; by drilling a well. Many times the natural gas is present with the crude oil and must be removed/managed before the crude oil is recovered. In the days before there was a market for natural gas it was sent to large flares and simply burned.
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