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View Full Version : Propane burners. Blown or jetted.



Gestalt
21st Mar 2017, 07:52 PM
Hi Guys, just from the little research that I've done on propane burners, it seems that there are two main types. Ie. naturally aspirated, usually using a mig tip for the jetting, and the forced air type with no gas jetting, just needle valve gas control.
I'd love to know the pros and cons from the experts here.
Eric

russ57
1st Apr 2017, 03:56 PM
Never call myself an expert, but I built a naturally aspirated burner because...
Don't need to worry about power source or failure thereof. (don't need flame sensor, for example)
Was about 1/2 way through a burner based on Ron reils notes, then I switched to mikey porter design.
Works fine for smithing, yet to try it for casting (because I'm yet to build furnace - I have a s/s beer keg, plus refractory, just need time now...)


-russ

bob ward
15th Apr 2017, 04:01 AM
Not an expert either, but the naturally aspirated LPG burner is simple to make and run, blowers add another level of complication, the choice depends on how much heat you need. FWIW I have a furnace made from a 20 litre pail and a 1/2" gal pipe burner with a .6mm mig tip, from cold it melts 2 kg of aluminium in 15 minutes.

ratters
3rd May 2017, 05:18 PM
I built a simple naturally aspirated gas burner not too long ago for use in a forge similar to what you are doing, and I found that the key was ditching the BBQ regulator and getting an LPG gas welding regulator set with gauges. I use the design with the mig tip for a jet and the LPG reg allows for far greater pressure to the point where the flame is blown out if you turn it right up. At full noise its a roaring hot blue flame over 1 foot long so aluminium is a walk in the park but I assume brass will melt no worries too. I also found that by adding a flared end to the pipe to widen the torch diameter it allowed me to run higher pressure and a bigger hotter flame.