Re: LP tractors

Posted by Roger on May 13, 2004 at 06:41:06 from (63.234.221.162):

In Reply to: LP tractors posted by Bill Wilson on May 12, 2004 at 09:14:37:

Bill, when you release the vapor from the tractor tank it will seem like you are losing a lot of fuel. However, LP Gas expands to 285 times its normal size. If you want to contain 1 gallon of LP Gas with no presure at 60 degrees temperature, the tank would have to be 285 gallons. I point this out as it is part of the explanation on how LP Gas is transfered. When the vapor leaves the tractor tank rapidly, it causes the tractor tank to cool, creating less pressure. The fuel from the supply tank is higher pressure and is forced into the tractor tank. This is the same theory used on Air Conditioning. Freon (or whatever they use now) is not cold. When it is forced through a small opening and comes out the other side, the rapid expansion causes it to be cold. This is the same reason why the air released from the valve stem of a tire on a hot summer day feels cold. Don't fill the tractor tank after you have been running the tractor. 1. it is dangerous. 2. Heat from the motor causes the tractor tank to have more pressure than the supply tank. Take a break, have a can of pop. It will fill faster after the motor has cooled.

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