James86004
Expedition Leader
A 20 lb BBQ cylinder would fit in the place I currently have two 5 pounders, but only on its side.
Some instances, like the diy turbine engines made from turbochargers (search propane powered beer cooler), turn the bottle upside down to draw off liquid.
funny, I had a travel trailer with side mounted 20lb tanks. The tanks look exactly like the ones in your pic except it was regular steel. It didn't look any different than a normal tank except that it had feet on the side in order for it to lie down. I'd wager it doesn't cost that much more than a regular tank, certainly not 10x's more like the aluminum tank.Can't be done safely with the 20 lb vertical BBQ tank. You'll get liquid propane rather than vapor, and no good will come of that. The cylinders really shouldn't even stored or transported that way. The tank's relief valve has to be in contact with the vapor space, and if the tank is more than half full of liquid, that won't happen.
That said, though, they do make horizonal 20 pound cylinders that have pretty much the same form factor as the barbeque tanks. There's an example here:
http://www.protanksupply.com/camping-propane-tanks_detail.asp?ID=1007
and they are widely available though, being generally made of aluminum, they cost close to ten times what Home Depot wants for the standard steel tank.
Newer tanks have the OPD in them and they shut off when they get tipped. It looks kinda like the float assembly in the back of your toilet and is designed to shut off the flow before you get the liquid propane which causes the bad day.
This 2.5 gallon tank worked pretty well on it's side the other day thawing out my engine block.
It did tend to flame up a bit but it ran and ran and ran and ran.
I used to think this too...but the OPD only affects filling, not dispensing LP. You can run with the tank upside down if you want and the OPD will not bother you. The liquid propane will though...
The only safe way IMHO is to get the proper tank for the job, like has been linked to above.