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Filling a Propane Tank From a Propane Tank Questions

Vanman

Subscriber
Last Subscription Date
07/10/2019
One NICE thing about having your own fill set up at home is you can get rid of those crappy modern valves and use the good, old, high quality ones, and just fill them properly. Same goes for the tanks themselves. They definitely don't make those like they used to.
 

slip knot

Subscriber
Last Subscription Date
12/27/2019
also one of those companies uses a special valve to prevent their tanks from being filled by anyone else, if memory serves me some kind of magnetic deal is required to fill those tanks.
My propane supplier cant fill a bottle from the exchange places because they have a proprietary magnetic valve on the fill side.
 

beezerbill

Subscriber
Last Subscription Date
01/10/2019
Dal - are you still following this thread?

How cold is it when you are trying to fill your little tanks?

And, how full is the big tank?

Lastly - any chance your propane has a bunch of butane in it?

A cold supply tank would give a low pressure head and slow filling. Butane drops this pressure even further. A close-to-full supply tank would have less gas above the liquid so any available pressure to drive liquid into your small tank would deplete pretty quickly. A less full supply tank would probably more successfully fill your small tank. One thing to try is to fill your small tank as you have been all along, then wait for the pressure in the supply to build back up (which happens as the liquid propane in the supply tank boils) and then see if more propane can be driven into your small tank. I have no idea how long you would need to wait. This would be more of an experiment than anything; as it appears you are now getting your small tanks full enough for your needs.

One more thing - if there is something else drawing propane from your supply tank at any substantial rate it will cool the propane even further, resulting in an even lower pressure in the supply tank and making filling your small tanks take even longer.
 

dalmatiangirl61

Subscriber
Last Subscription Date
07/10/2019
Yes still following. Coldest temps so far were a couple nights where temps dropped to -1 or so, morning after I tried to fill tanks and got just enough to last thru the cold spell. Sent an email to the propane hand pump co, but have not heard back, maybe I should call one of the distributors. My small tanks are all 30lb tanks, 2 aluminum, 2 steel, the steel tanks seem to fill faster, and 1 of the aluminum tanks is clearly the slowest to fill, maybe defective valve? Big tank was just topped off again on Friday. How would one determine if they are cutting propane with butane?
 

beezerbill

Subscriber
Last Subscription Date
01/10/2019
I know this was a while ago, but here.

https://www.engineeringtoolbox.com/propane-butane-mix-d_1043.html

With a good gauge on your tank, you should be able to discern the difference between pure propane and a mix, especially as temperatures warm up.

Could even put the gauge on a fitting that attaches to the tank outlet, or on your small tank, tee'd into the hose that runs to your heater or whatever you are running. But whatever you do, be careful!
 

Tracy T

Subscriber
Last Subscription Date
07/16/2019
just had two 100 pounders filled at the filling station, it was cold and took longer than normal even with the pump doing the work. you may be experiencing icing, the gas company mixes methonal in when loading a truck. i have no idea how much or how often, but even the delievry trucks sometimes have this icing condition.
 

dalmatiangirl61

Subscriber
Last Subscription Date
07/10/2019
I have figured out how to get tanks full, the trick seems to be to barely crack the bleeder, and wait half hour to 45 minutes. Seems awfully wasteful, need to find one of those hand pumps.
 

Tracy T

Subscriber
Last Subscription Date
07/16/2019
the trick seems to be to barely crack the bleeder, and wait half hour to 45 minutes. Seems awfully wasteful,
as long as no liquid is coming out of the bleeder you havent wasted a thing. but i know, it sure seems like it!
 
B

BergmanJ

Guest
as long as no liquid is coming out of the bleeder you haven't wasted a thing. but i know, it sure seems like it!
Do it all the time here from my 1,000 gal. tank - works just fine. And, doesn't cost me $20.00 for 16#!

Regards, JLB
 

drumfield

Subscriber
Last Subscription Date
04/02/2020
Another thing you might consider, get a 120v magnetic automotive oil pan heater, and apply it to the bottom of your "mother" tank. If it is warmer, the pressure is more, and the flow should be too.:)
 

vangasman

Registered
I know it's a little late on this but on my tank my wet leg is on the bottom of the tank, not the top. I also used a what is termed a 1/4 barrel with a removable top and buried it so I could place the propane tank at ground level so it would fill even faster. Hope you have it figured out by now.
 
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