[TheForge] Problems with propane burner

Wed Sep 10 07:12:00 2003

    Marc,  That was what I found had to be done was flare the nozzle to make
mine idle at 1/2 psi.
    I also believe I have my jets drilled to about .054........so that mig
tip is probably drilled to .040 as a contact tube to allow .035 wire to flow
thru even when getting warmed by the welding arc.  If it is just a mig tip,
for a dollar you can get another one and try the larger jet size also(an
.045 would be just about right).......if you feel you need the heat.  I
found I could run on less of a size but got more scale - so the larger sized
jet yielded less scale with a slightly carburizing flame.


Ralph
----- Original Message -----
From: "Marc Godbout" <[email protected]>
To: "TheForge" <[email protected]>
Sent: Saturday, September 06, 2003 11:13 AM
Subject: [TheForge] Problems with propane burner


> First of all, my castable project went really well. The forge has been
> through its first firing with only a few small stress cracks. Now time
> will tell.
>
> But my new burner has some problems and I'm hoping to get some ideas
> from you guys. I'm trying some slightly different design to better match
> my application. First, the mixing tube is a 90 degree sweep of 1" rigid
> conduit. I wanted to lower the profile.
>
> The other difference is that I cast the nozzle into the refractory wall,
> but I didn't flare it. Also, this is a side-arm, using a 1 1/4" cross
> fitting with a reducer to the 1" tube. I've got a .035 mig tip for the
> orifice.
>
> The problem is that I have a tough time keeping it running at low
> pressures. I don't have a gauge on it, but from the sound it's probably
> well over 5 psi, maybe even 10, before it starts sputtering (with a
> nifty "whoop" sound), and then the flame travels all the way to the mig
> tip. I was able to get much lower when I had it out of the forge, using
> just a straight pipe for the nozzle.
>
> High end is no problem. Things get bright yellow hot in there in no time
> at all. And that's with just one burner in an 18" long half-tube,
> half-stacked-brick, with 25 psi (the max that my delivery system will
> do).
>
> I'd like to get really low for idling between heats to save propane, so
> any thoughts would be welcome. Should I try flaring the nozzle? This
> castable is easy enough to carve with a round rasp.
>
> Thanks.
>
> -Marc
>
> --
> Marc Godbout
> http://www.ironringforge.com
>
> New England Blacksmiths Membership Director
> http://www.newenglandblacksmiths.org
>
>
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