Re: LP Gas - How it works

Posted by Glen in TX on November 03, 2005 at 16:23:35 from (208.246.9.18):

In Reply to: LP Gas - How it works posted by Specter on November 03, 2005 at 08:05:25:

LP tractors aren't any harder to work on than others and are good as long as things are done safely. You need good valves and lines that don't leak. Parts for those are available from LP dealers. One valve is liquid and one is vapor. Your filler inlet is for liquid and the other outlet is a vapor return line for taking vapor back when filling. Propane and butane are vapors at regular temperatures but turned to liquids when compressed. These liquids will boil at low temperatures, butane 31 deg. F. & propane 44 deg. F. It is kept under pressure to keep it in a liquid state. This ranges from low pressure in cold weather to higher pressures in hot weather. A proper working relief should be used on the tank to prevent excess high pressures. Propane and butane are heavier than air and will settle in low spots. It's not any more dangerous than gasoline if handled correctly. You open the vapor valve for starting the engine and vapor boils off the liquid and a regulator keeps the pressure lowered to the LP carb. After the engine is warmed up the liquid valve can be turned on and liquid LP is turned to a vapor at the vaporizer being warmed by the warm engine coolant flowing thru a coil in the vaporizer. Then the vapor valve can be shut and it can be ran on just the liquid valve. It will be easier to start if switching back to vapor before shutting off. Also can switch back to running on just vapor for about a half hour instead of liquid before shutting down to lower the pressure in tank making it easier to refill later. When engine has cooled off to refill you hook a liquid line up on nurse tank to liquid filler valve and a vapor return line back to vapor return on filler tank. Most can be filled with a 250 - 300 gal. nurse tank just fine without pumping but will fill easier from a larger tank. States vary on LP fuel regulations so check with your local LP dealer and state. Illegal to haul nurse tanks on a trailer now. Most tractor companies had a supplement operators manual on safe operations and handling of LP gas equipment.

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