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Subject: LP questions

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Walt/Tx    Posted 11-22-2017 at 14:51:42 [URL] [DELETE]        [Reply] [No Email]  
  • LP questions
  • Collector mag has a story this month about an LP powered 641. The owner talks about LP pumps being necessary up north to fill tractor tank etc.. I was raised on a ranch in Texas having everything LP (butane in those days), 2 9N's, 2 8N's, 2 jeeps, Dodge grain truck, MM baler. I never heard of nor saw an LP pump of any sort. Tanks were filled via tank pressure equalization only using a relief valve which let vapor escape until you saw liquid coming out then you unscrewed it, shut off main tank valve and you were done and ready to go with a full tractor tank. But, I haven't filled a propane tractor in many years.
    So tell me, are there LP pumps up north due to temps? Is this a difference in propane and butane or just a temp thing?

    Island Mike    Posted 11-23-2017 at 12:35:00 [URL] [DELETE]        [Reply] [Email]  
  • Re: LP questions
  • When I get my 20 pound tank filled, they pump it from a larger tank. I had two 30 pound tanks that expired. It was much cheaper to buy 3 20 pound. And now they do an exchange, empty for full. That saves them time, and saves me the problem of expiry.
    In my area having a tank outside is fine. Up North they can freeze, and the propane will not flow. So they take them inside for a while to warm up.
    I will never go to a place where a propane tank might freeze.
    We have a 5 pound tank on the boat for the BBQ. SOS provided good info.

    Island Mike

    SelectOSpeed    Posted 11-23-2017 at 10:16:25 [URL] [DELETE]        [Reply] [Email]  
  • Re: LP questions
  • Butane and Propane although similar have different properties. 1 gallon of Butane has 102600 BTUs, 1 gallon of Propane contains 91500 BTUs. The boiling point of Propane is -44 degrees. Butane boiling point is +32 degrees. This means that at temps below -44į, propane will not vaporize, and remain in a liquid state. The same for Butane at +32į. Butane tanks are normally buried underground below the frost line to insure vaporization at temps approaching freezing. Butane use was more common in the southern states due to more temperate climate, and rarely, if used at all in the Northern areas of the country. Butanes container (tank) pressure is much lower than Propane. Lighters use Butane due to its lower pressure. As far as pumps are concerned to transfer the products, both with gravity feed from one container to the other, provided the container being filled is Lower than the other. Pumps just make it faster. The Bleeder Screw or vent valve as some term it, is to indicate that the container is at its 80% Full level and to prevent overfilling. It really doesn't function as a pressure relief to decrease filling time. FWIW, SoS.

    Walt/Tx    Posted 11-23-2017 at 13:15:01 [URL] [DELETE]        [Reply] [No Email]  
  • Re: LP questions
  • Thanks for the info. I can see LP would be impractical up north but was very common around here in the late 50ís on tractors and pickup trucks. Our pair of 8nís had dealer installed tanks and looked nice, both bought new in Ft. Worth. Our 9nís had tanks mounted in front of grill.

    Bob TX    Posted 11-23-2017 at 00:29:53 [URL] [DELETE]        [Reply] [Email]  
  • Re: LP questions
  • Early 50's small high school north of Gatesville, put in butane tanks were above and insulated with a heater to keep them warm we were told to stop it from freezing.
    Late 60's Dad just hooked up the old JD opened the valves until it sputtered.
    In the 90's Home Depot in Dallas used pumps to fill forklift tanks. That's all I know.

    AL CT    Posted 11-22-2017 at 15:39:44 [URL] [DELETE]        [Reply] [No Email]  
  • Re: LP questions
  • Local dealers sell propane, 20# and up tanks. Propane is pumped into smaller tank, as you say. They open a vent screw until liquid leaves the tank. I purchase propane in my 100 gallon tank at my house. That has a percentage of fill gauge, that is filled to 80% full, allowing for expansion.
    Not sure on the difference between propane and butane. Other more learned minds will answer that one.

    Walt/Tx    Posted 11-22-2017 at 23:35:35 [URL] [DELETE]        [Reply] [No Email]  
  • Re: LP questions
  • I did some more reading and see itís done both ways, bleed off and pump. They say you get 50-60 percent fill with bleed off and 80+ with a pump so guys with big tractors used a pump. Temp is not a factor nor the butane/propane thing. Just another thing I never knew.

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