Patriot,
An explanation of the physics of evaporation is in order here. Liquid oxygen is stored as such since it takes up less space than compressed gaseous oxygen. However, when you turn a liquid into a gas, there is a "latent heat of vaporization" that needs to be taken care of. For converting a liquid into a gas, that translates into a heat INPUT into the vaporizing oxygen. Getting heat out of the surrounding atmosphere, means it will get cold. Getting too cold means vaporization slows down, as heat from the surrounding area can't flow into the tank fast enough.
Running the liquid oxygen into a remote tank and calling it a vaporizer may or may not increase the actual heat input into the liquid. It may help if the remote tank has a lot of surface area that can draw heat from the surrounding environment. However, there are some engineering issues when dealing with fabricating vessels designed for liquid oxygen service. It is not something you may wish to jump into unless you know ASME pressure vessel code requirements for oxygen service.
A true vaporizer is a heat exchanger that has a heat input in the form of electricity or a fuel gas to provide the heat required for vaporization. It is a controlled environment with thermostats and the like to control the heat input. For example, in a sawmill I worked at many years ago, we used butane for fuel in the lumber dry kilns. It was much like propane, in that you could store it as a liquid. However, it didn't vaporize as easily as propane so when using it in the wintertime it needed some assistance to vaporize rapidly enough to service our needs. The vaporizer used was a commercial unit, filled with anti-freeze as a heat exchange medium. A butane flame kept the anti freeze hot and liquid butane flowed through tubes in the anti freeze. It was kinda like a boiler. Worked very well--the incoming liquid pipes were inches thick in frost and the butane tank was too but the kilns never starved for gas.
I'll bet you if you talk to your gas supplier or your torch supplier about a O2 vaporizer you will get one pronto.
The other suggestion of linking several O2 tanks together is another way of spreading out the necessary heat flow into the oxygen tanks. If you are pulling a given amount of gaseous O2 out of one tank it will need a certain amount of heat input. Spread the same amount of heat input over a half dozen tanks and each tank needs 1/6 of the heat input...and may not freeze up so bad.
Hope this helps!
Jon.
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