Extend-a-Stay question
Is it OK to open the valve on the main tank while connected to an external tank. Don't want to run out of propane overnight.
Forum Discussion
MrWizard wrote:
vacation or extended stay ?
I would Not do it
if both are full, you are going to run low on both
if one is half and one is full, the higher pressure full one is going to bleed over to the other one until they are equal
then consume both at the same time, yes it will last longer
you run the risk of running out and having nothing at all
if the portable runs out you can turn it off and open the frame tank
keep to {2} portable cylinders,
connect one, when its low, change it
less likely to run out that way
Well, actually, in a vapor withdrawal system, the vapor pressure is going to be the same even if one tank is empty, then only vapor will transfer. No liquid propane will transfer between tanks. As long as either tank has a tablespoon of liquid propane in it, the vapor pressure will remain constant in both tanks. When the last of the liquid boils off, the pressure will drop rapidly. That is why the line pressure gauges are, for all practical purposes, useless. When the pressure drops, you are out of propane!
