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Old 10-13-2015, 07:49 AM   #1
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Help w/propane

Looking for way to fill onboard tank farm 5gal cylinder.
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Old 10-13-2015, 08:00 AM   #2
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You can't "fill" an ASME tank from any other container, be it another ASME tank or a DOT cylinder. You can "equalize" them, but once the pressures equal, that's it.

There are kits and you can buy fittings on your own to install a port to connect a DOT cylinder to your ASME tank plumbing, but that's about it.
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Old 10-14-2015, 12:47 AM   #3
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Sheetshaker----I fill my MH all the time this way but there is a trick to it. You need a Tee in the hi psi line before the reg. and a hi psi flex line to go from the tee to your 20lb tank. Hook these up turn the 20lb up side down and open valve, next place a 1gal bag of ice on top the MH tank to cool it and find a way to warm the 20lb tank the liquid lp will flow to the MH tank until it is empty of liquid takes about 1 hr. I use a heat lamp to heat the tank and have used a heating pad. Have filled tanks this way for years.
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Old 10-14-2015, 12:52 AM   #4
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Originally Posted by jesilvas View Post
You can "equalize" them, but once the pressures equal, that's it.
Which is why, here in WA, they are required to use a temperature compensated pump and meter. Assures you getting the propane you pay for.
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Old 10-14-2015, 03:43 AM   #5
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Originally Posted by autofish View Post
Sheetshaker----I fill my MH all the time this way but there is a trick to it. You need a Tee in the hi psi line before the reg. and a hi psi flex line to go from the tee to your 20lb tank. Hook these up turn the 20lb up side down and open valve, next place a 1gal bag of ice on top the MH tank to cool it and find a way to warm the 20lb tank the liquid lp will flow to the MH tank until it is empty of liquid takes about 1 hr. I use a heat lamp to heat the tank and have used a heating pad. Have filled tanks this way for years.
The problem with your method is you could overfill your tank, if not carefull.

If you connect to the fill port, the 80% valve will stop that from happening.

Will propane flow out of an upside down 20 lb. tank with a OPD valve ?
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Old 10-14-2015, 05:16 AM   #6
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A propane filling station is the safe way to go. Propane is not something to experiment with. Very unfriendly.
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Old 10-14-2015, 06:38 AM   #7
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Quote:
Originally Posted by autofish View Post
Sheetshaker----I fill my MH all the time this way but there is a trick to it. You need a Tee in the hi psi line before the reg. and a hi psi flex line to go from the tee to your 20lb tank. Hook these up turn the 20lb up side down and open valve, next place a 1gal bag of ice on top the MH tank to cool it and find a way to warm the 20lb tank the liquid lp will flow to the MH tank until it is empty of liquid takes about 1 hr. I use a heat lamp to heat the tank and have used a heating pad. Have filled tanks this way for years.

if your going to go through all this trouble, why not just hook up the 20 pound tank since you have the T and the line already?
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Old 10-14-2015, 06:49 AM   #8
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I use Tractor Supply Stores to fill our motorhome tank and the other BBQ grill farm) tanks. With a smaller "onboard tank farm 5gal cylinder" you may need to be able to remove the tank for inspection of the tank and/or date of manufacture. This is for your own protection.
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