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Tractor Talk Discussion Forum

LP tractors

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Bill Wilson

05-12-2004 09:14:37




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I'm looking at an LP fueled tractor. My question is, How do you fill the tank on-farm? Do you need a pump to transfer the liquid out of my 250 gal tank, or do you just fill it with vapor? Any help would be appreciated. thanks!




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Roger

05-13-2004 06:41:06




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 Re: LP tractors in reply to Bill Wilson, 05-12-2004 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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Simply put---

05-12-2004 14:03:02




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 Re: LP tractors in reply to Bill Wilson, 05-12-2004 09:14:37  
No pump is needed.

Simply put---your tank must have a "wet leg" in which liquid LPG comes out of, through a hose attached to the liquid port of the tractor tank, and into the tank.

Vapor is bled off of the tractor tank, and is replaced by the incoming liquid.

The process I've described is the VERY SIMPLE version. Some discussion was more detailed some time back.



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harley1983

05-12-2004 21:22:12




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 Re: Re: LP tractors in reply to Simply put---, 05-12-2004 14:03:02  
I hauled lpg for a spell, and the only thing needed is a hose with the correct fitting on it to screw onto the "wet-leg" as the gentleman above stated, this is usually found out from under the dome lid, and on the tractor end, you need the corresponding fitting to fit onto your tractor tank, usually large threads, and of course a valve on the tractor end so that when the tank is full you can shut it and the vapor line on your tractor off. Best to check with your local gas supplier for parts, and maybe a short demonstration. This isn't anything to fool with. LPG can hurt you dead if handled incorrectly, i.e. fueling with the tractor running, spraying liquid propane on hot parts, etc. If handled correctly it is just as safe as any other fuel. Good luck. Harley

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