[TheForge] burner question

Tue Dec 2 22:35:00 2003

At 12:23 PM 12/1/2003 -0600, you wrote:
>Andy,
>
>There is a drawing here...http://www.blacksmithsjournal.com/forgeinfo.html
>
>There is no flare on the end of the burner that goes into the forge. The 
>outside end is a piece of pipe that telescopes over the main burner pipe. 
>The gas goes in the end. There are cut outs on the burner tube and the 
>telescoping cap that allow for air adjustment.
>
>Bob

The Venturi burner is an air amplifier. the gas jet entrains air, mixes 
with it down the length of the tube and the flame front burns at the right 
pressure point at the flare, where the pressure drop holds the flame front.

On the simple pipe burners, the reducer at the air end allows more air to 
enter which is slightly compressed by the gas jet.  Adjusting plates allow 
the mixture to be adjusted by reducing air flow.

In Jerrry Hoffman's design, the laser cut slots in the sides of the tube 
allow even more air and easy adjustment just by rotating the slotted outer 
ring. It's a machinist's solution, instead of a plumber's  <GRIN> Still 
allows adjustment of the burner for a range of gas pressures and oxidizing 
-neutral- and reducing flames. State of the art? No. Fine for a forge? Sure.

Michael D. Horgan , [email protected]
http://members.aol.com/lughaid/
posting from
  A BRAZEN FORGERY
Blacksmithing and Metalwork
Claremont, Ca.