[TheForge] Burner types was Fixing my forge

[Jerry Frost]

My pleasure Geoff.

In fact I feel I owe you one for getting me to open up 
like this; I'm normally such a shy and quiet guy. 
<grin>

Where you position the jet depends on what the primary 
and secondry materials are. Primary is the propane jet 
in this case. Still, putting it upstream seems to be 
the most efficient.

Just in case you don't know them thee are the basic 
ratios:

The tube length should be 8-9 x the throat dia.

The air intake area should be at least 2 x the throat 
dia.

The throat being the narrowest part of the burner tube, 
usually where the bell, "T", etc. connects to the tube.

For example these are the sizes for my basic "T" jet 
burner. One, 1" x 1" x 1" plumbing "T". One, 1" x 8" 
black iron nipple. One 0.045" mig tip shortened to 
9/16". (I haven't shortened one more but will and will 
let everybody know how it works.) Then there is the 
necessary bits to make the jet up to the "T". I usually 
drill and tap the "T" to recieve a short length of lamp 
rod. There are a lots better alternatives I haven't 
gotten around to trying yet.

My one major p[iece of advice if you try one of my 
burners is use a 1" Cross rather than a "T". It'll make 
mounting the jet  lot easier and will allow you to move 
it farther upstream.

If you're building something with a different 
configuration be sure of a couple things: First make 
sure the jet is aligned as straight down the bore as 
possible. Second, make the air intakes at least twice 
the area of the bore.

There is wiggle room in the bore length but not a lot, 
making it much longer or shorter will inhibit 
induction. If you have to make the tube longer increase 
the diameter about 25% every time you double the 
length. For example a 1" bore 8 or 9" long is fine, 
make it longer and increase it to 1 1/4" dia till you 
hit 17 - 18" then increase it again. I have no idea how 
long you can do this but am sure it isn't forever. 
Probably only a couple step increases. If you can taper 
the entire length of the tube you can make one quite 
long and only increase induction.

Frosty
-------------------------------
If it ain't forged
it ain't real.
Wrought iron is.
The FrostWorks

Meadow Lakes, AK.

http://www.artmetalradio.com/

From: "Geoff" <gjn111 at gmail.com>


> Jerry
>
> Thank you very much I now have a understanding. I 
> have a burner that I built and from your description 
> I built 'jet Ejector' type. I think. Just one last 
> question to clarify. The jet of gas is it up stream 
> of the air intake for the jet ejector type? It look 
> like this to me and that is the way that I built my 
> burner. I have seen some that it looks as if the jet 
> is halfway up the air intake. I have seen the type of 
> burner that I built described as an upwind burner.
>
> Thank you again for the time you took to explain the 
> burners to me. I really appreciate it and all the 
> other folks on this list thank you.
>
> Kind regards
> Geoff
>