Bravo Milt!! I think I have the same set up here in my shop in
St.Paul. Only I have the largest oxygen tank and two one pound
propane tanks connected together by a "T" fitting. Two pounds and
under is code in my area. You'd be surprised how long these tanks
last most times. With heavy casting weeks they still last about a
month. BE CODE COMPLIANT!!! Check out the rules in your area. Most
places allow one pound and under inside. Again check the Fire Codes.
Some additional comments about the set up. I use a gas ball valve
shut off for the top of the cylinder. This is done by having a camper
(RV) parts supplier connect a disposable tank top fitting to the ball
valve. This shut off now simply screws on the top of the disposable
tank. An easy combination that adds safety to your set up. A hose
fitting screws into the ball valve. I know Smith Torches sells a
fitting that screws to the top of a disposable propane tank, but it
shuts off simply by unscrewing. Not enough for me. I want to shut
this tank off at the end of the day.
The pressure regulator can also be a camper propane gauge. This is
preset for about five pounds of pressure. I'm not quite sure exactly.
It has always worked fine including casting platinum. So for bench
work, fabrication, gold & silver casting as well as platinum work and
casting it works great. With most any torch also. I connect a hose
from the ball valve to the gauge and the hose from the gauge goes to
the casting area as well as bench set up. You never have to touch the
regulator with it being preset. Not terribly expensive either.
Some have mentioned refilling these tanks. Don't take this chance!
They are real cheap in the first place, about $3.00 per one pound
tank. I say this because when changing out an empty tank sometimes
the tank pressure sealed top, which keeps the gas in, will leak a
little bit and stay open. A little bit is like a flood to me. Pitch
the tank, don't be cheap, buy a new one. I also try to buy the same
brand name of propane all the time. Coleman is the brand most
available here. Maybe someone could comment on weather there are
different grades of propane or not. Remember the manufacturer only
want to heat things up with these fuels, not have the purity grades
we would like.