[TheForge] propane forge

Mon Sep 2 01:05:00 2002

Frosty,
Where can I see a jet type of burner or plans for one?
Thanks,
Bob
----- Original Message -----
From: "Jerry Frost" <[email protected]>
To: <[email protected]>
Sent: Sunday, September 01, 2002 12:45 PM
Subject: Re: [TheForge] propane forge


> As has been pointed out already, propane or any fuel for that matter has X
> btus per unit, all you can effect is efficiency. When it's reduced to the
> basics, there's no difference between a gun and naturally aspirated
burner.
> There are pros and cons to each but not as far as burn efficiency is
> concerned, either type, properly set up and operated will yield a proper
> burn.
>
> A naturally aspirated burner is a non-mechanical blower using a flamable
gas
> or liquid as primary pressure. We use two basic types of amplifier, linear
> and jet ejector.
>
> A linear amplifier is what we get on naturally aspirated commercial forges
> and can be identified easily by looking up the bore. With choke plates,
> flame holders, etc. removed you can look straight through to daylight. A
> commercially built linear amplifier designed for propane/air will produce
> around a 19:1 amplification.
>
> A jet ejector is basically the same as a linear but the air intake is at
90*
> to the bore and jet (the intake on a linear is in line with the bore and
jet
> . . .linear.) For reasons I don't undedrstand a jet ejector is around 30%
> more efficient yielding around 29:1. The "mongo" burners are jet ejectors.
>
> Those of us who build our own burners have some trouble holding commercial
> tolerances <grin> so a home made linear amplifier is harder to get tuned
as
> 19:1 max efficiency is pretty close to the 17.5:1 for a neutral
propane/air
> burn. It's much easier to build and tune a jet ejector with it's much
higher
> efficiency. You have wider tolerances to play with.
>
> A gun burner is easier to build and much easier to tune but you have to
buy
> a blower and electricity, it takes up more room and is heavier. A
naturally
> aspirated burner can be made for $10-15 and doesn't need electricity but
> takes more precision to build and is harder to tune. I spent $9.00 on the
> one I'm using now and it melts steel easily but I spent a day tinkering
with
> it tuning.
>
> Does it really matter if you prefer a gun (blown) or naturally aspirated
> burner? There's been much heat generated on this list in the past on this
> topic but it's still the same old Chevy vs. Ford debate. Both work just
> fine, both have pros and cons and it's still a matter of taste and need.
> What matters is how you feel and what you need.
>
> Frosty
> ------------------------
> If it ain't forged
> it ain't real.
> Wrought iron is.
> The FrostWorks
>
> Meadow Lakes, AK.
>
>
> ----- Original Message -----
> From: "Lynn Emrich" <[email protected]>
> To: <[email protected]>
> Sent: Saturday, August 31, 2002 3:01 PM
> Subject: Re: [TheForge] propane forge
>
>
> > I'm not sure why someone would choose a naturally
> > aspirated over a blown forge. The blower reduces the
> > gas usage quite a bit.
> > Also, I don't see a good reason to make a small intake
> > for the gas. I use a 1/4" pipe supply. I suppose that
> > the high pressure would jet the gas more into the
> > forge but the larger opening would seem to mix the gas
> > before it enters the forge body.
> > Jay has been on this mail list for several years and
> > his pressure regular costs less than I paid at the gas
> > company.
> > BTW, my guage broke over a year ago and I haven't
> > gotten around to replaceing it so I guess it's not
> > really necessary for me.
> > Lynn
> > http://www.geocities.com/theatre_weapons/index.html
> >
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