[Robotgroup] Propane Torch

[Marvin Niebuhr]

Bob,aaarrggg, like Les says,"matches". I just fired up my H.F. torch and it really blasts. It If you notice it has a split nut which means it is revearced threads and that is what a propane tank only accepts directly without needing a regulator. The only problem is, is if you run it for a few hours, it may freeze up, but the orfice is big enough ( the principles of air conditioning). We've burn many a miles of fence weeds with one of them in West Texas. Marvin
  ----- Original Message ----- 
  From: Edwin Wise<mailto:edwin at simreal.com> 
  To: The Robot Group Mailing List<mailto:robotgroup at puremagic.com> 
  Sent: Tuesday, August 28, 2007 1:19 PM
  Subject: Re: [Robotgroup] Propane Torch



  On 28 Aug 2007, at 11:44 AM, brooksdesign wrote:

  > if you want to modify by adding hose or differant nossle you may  
  > want to add a check valve or device I think is called a flash back  
  > blocker which is kind of like a stone filter for fish tanks but is  
  > made of a low melting point metal powder that seals itself if the  
  > flame tries to travel back up the hose .you can get them at any  
  > welding supply place .

  A flashback arrest is a good device (it acts by cooling any flame  
  that flies back up the tube, extinguishing it) and is vital for  
  systems that use extremely volatile gasses such as acetylene.   
  Acetylene is touchy stuff -- but in my reading so far, nobody seems  
  to think you need one for propane.  Propane won't burn in the tube w/ 
  o air, and unlike acetylene it won't ignite due to shock waves or  
  pressure, so as long as you have positive pressure, it should be good.

  If I'm mistaken, please point me at a good reference... I've done a  
  fair chunk of research so far and propane seems to be pretty darned  
  safe overall.

  Be careful about hoses and stuff, though; propane dissolves rubber.   
  A good supplier for parts is:

  http://www.cajunshoppe.com/burner.htm<http://www.cajunshoppe.com/burner.htm>

  and

  http://www.flameengineering.com/<http://www.flameengineering.com/>

  Edwin!




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