8 replies to this topic

[FastEHHolden]

On bigger cylinders its quite a common thing...but they use flashback arrestors...not sure that using the small bottles is such a good idea.

[Statler]

The small bottles wont flow enough gas.
You will risk flashbacks & blow backs, which is very dangerous.

[LJ RB30]

I was thinking, I have an old basic torch that hooks up to a Primus bottle (Tiny round LPG 2kg) which is brilliant for silver soldering. It's the same style of thing as the torches which screw into the top of those small gas bottles about the size of a 1 litre milk carton. Mines a little bigger than those. I can get stuff pretty hot but I wondered about using an oxy torch with LPG instead of acetylene. I have used this style of thing on jewellery repairs in the form of a mini torch (the body/handle is about the size of your average artline texta) and it worked brilliantly too.

Am I just looking for more uses of my BBQ or would this actually be a practical thing to do?

My brother was using LPG for years (full size bottle though) in his general engineering business but had to use different regs & tips, cheaper gas & no bottle rent. Don't remember what the cut quality was like. Have to ask him if he ever tried oxy welding with it?

[mr5000]

my dad used to use a turbo torch with oxy and lpg because he couldnt afford to pay rent on oxy bottles(well probably more didnt want to) he said it works but its got to be in a spot were nothing can be burnt because of the size of the flame which s why he uses acetelene now much more precise

[A9X]

Loosely speaking , large engineering workshops use LPG for cutting steel in quantity or preheating steel for welding because it is significantly cheaper then Acetylene in quantity.

However , don't then confuse this with LPG being used for welding or burning etc by plumbers / painters and kind. They use LPG in this application because it is a softer heat.

BOC/Liquid Air will reccoment fuel gasses in the following heat ranges.

LPG / Air softest heat - paint scraping etc
LPG / Oxygen soft heat - lead wiping / soldering / pre heating but with specific cutting tips - steel
Acetylene / Oxygen - general brazing and silver soldering , cutting.
Hydrogen / Oxygen - Glass blowing and jewellry work used for maximum heat but also for cleanest fuel with least impurities.

Happy heating

[Statler]

Have to ask him if he ever tried oxy welding with it?

It's no good for oxy welding.