Post by: netcoyote on April 19, 2015, 07:59:56 AM
Anyone have experience with this, good or bad?
Storing them inside where it will be cooler just doesn't seem like a good option.
Post by: MADMAX on April 19, 2015, 08:34:35 AM
Post by: Kittman on April 19, 2015, 08:53:33 AM
Post by: netcoyote on April 19, 2015, 10:03:55 AM
Store the bottles in a well ventilated space where there is no source of ignition, and make sure the pressure relief valve is positioned above the liquid level in the cylinder/bottles.
These are the type of tanks I'm talking about. Do they still need to be stored vertically since there seems to be a relief/fill fitting near the bottle fitting?
There will be no source of ignition near them on the roof rack but they will be getting pretty warm sitting in the sun under a tarp.
(https://hunting-washington.com/smf/proxy.php?request=http%3A%2F%2Ft0.gstatic.com%2Fshopping%3Fq%3Dtbn%3AANd9GcRpqzJPMKDHln-Kg3cjjgINfg8E5knnQV_FMbQbOaKiYcWLMk0U3to7HMCH6qgqfjS-nY2MkLc%26amp%3Busqp%3DCAY&hash=60bc7372ab779a1f3d8449a43c23c62152eb8b61)
Post by: 92xj on April 19, 2015, 10:12:23 AM
Post by: Kittman on April 20, 2015, 10:33:31 AM
How much pressure does propane generate? It depends on the temperature:
•At a temperature of 70° F, propane's vapor pressure is 124 PSI.
•At a temperature of 162° F, propane's vapor pressure is 390 PSI.
Portable tank valves release at about 250-275 psi and the disposable bottles at 375 psi.
Probably why you see the small ones on the store shelves, but the larger ones must kept stored outside. It would seem unlikely you would have any problem if you store them upright, out of the direct sunlight and in a spark free and ventilated place. Personally, I store them inside my slide in camper cabinet in a small cardboard box in the upright position. Never a problem, with all the alarms in there to boot.
Post by: Firedogg on April 20, 2015, 12:07:24 PM
If they are ones you have refilled yourself off of a big tank, then I would make sure to store them outside as the valve has a tendancy to not completely seat leaving a small leak. I have gotten brass screw on tops with "0" rings for mine for this reason.
Edited for better price...
http://www.campingworld.com/shopping/item/propane-tank-brass-cap-2-pack/55148
Post by: Knocker of rocks on April 20, 2015, 12:30:24 PM
Delving deeper into this is what I've dug up on the subject:
How much pressure does propane generate? It depends on the temperature:
•At a temperature of 70° F, propane's vapor pressure is 124 PSI.
•At a temperature of 162° F, propane's vapor pressure is 390 PSI.
Portable tank valves release at about 250-275 psi and the disposable bottles at 375 psi.
Probably why you see the small ones on the store shelves, but the larger ones must kept stored outside. It would seem unlikely you would have any problem if you store them upright, out of the direct sunlight and in a spark free and ventilated place. Personally, I store them inside my slide in camper cabinet in a small cardboard box in the upright position. Never a problem, with all the alarms in there to boot.
That is different than the pressure in a bottle with two phases present.
I'll come up with the answer later
Post by: Kittman on April 20, 2015, 01:19:49 PM
Post by: CAMPMEAT on April 20, 2015, 01:27:49 PM
Post by: netcoyote on April 20, 2015, 04:44:01 PM
Sounds like even if they got hot, the worst case is they would vent out excess pressure and I would loose some propane. There is no ignition source so that's not a problem. I'll keep an eye on it as I go further south with higher temps.