Most propane will put off some smoke before you add the oxygen. this is normal due to incomplete combustion. That is why we use the oxygen!
Also if the tank sets in the heat for a while the pressure inside climbs as the temperature of the liquid propane increases. This is also normal. It can not climb above a preset level due to a safety release devise built into the valve assembly.
The increased pressure can push a little extra at the torch on start-up. That will make the flame a little "dirtier" for a bit. The more expensive 2 stage fuel regulators can help some. Or just start with a very small propane flame and add oxygen right away and then "step - up" a little of each until you reach a working flame.
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Working with a Red Rocket,Red Max,Natty hand torch-- and tanked oxy from a Homefill system
Bryan M
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