gas forge burner question
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Subject Author Date
gas forge burner question Rusty_iron 08-22-2006
Posted by Rusty_iron on August 22, 2006, 9:23 am
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Gday all,
is there any advantage or disadvantage to using a blown burner over a
venturi or atmospheric type?

I trying to decide which type to build, I know I know, build both and
test.... :-)

Rusty_iron


Posted by Chilla on August 22, 2006, 10:25 am
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Hi Rusty,

Both have their up side.

The venturi or naturally aspirated are portable, and can be taken
anywhere you can carry a gas bottle.

Blown requires an extra air source, whether delivered by hand or by an
electric motor.

Some say that you can't get the temperature to forge weld with a
naturally aspirated burner... bollocks to that, it can be done.

The forced air burner in theory can get hotter than a venturi style, but
I find that propane without air is enough for me. I smelt bronze also
with a naturally aspirated burner. I don't think I could smelt wootz,
but I have an experiment in the pipeline (thanks to an earlier post :-) )

It really depends on the size of your firebox and if the flames from the
burner are forming a vortex.

Give me the details of the forge it's going into (if it's going into a
forge at all that is). Is it for a forge application?



Regards Charles



Rusty_iron wrote:
> Gday all,
> is there any advantage or disadvantage to using a blown burner over a
> venturi or atmospheric type?
>
> I trying to decide which type to build, I know I know, build both and
> test.... :-)
>
> Rusty_iron


Posted by on August 22, 2006, 4:51 pm
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> Both have their up side.
> The venturi or naturally aspirated are portable, and can be taken
> anywhere you can carry a gas bottle.

The one I've heard is the force air type is easier to get up and
running the first day. ;)

> forced air burner in theory can get hotter than a venturi style...

I wonder if that's really true if the naturally asprirated type is
designed and ran at optimum? It's still just air and propane...
unless they are talking some sort of pressurized setup?

Rust, got a little blower? Brand new ones ain't exactly cheap and
the small ones I've found at the scrap yard lately were all 240v.

> I don't think I could smelt wootz, but I have an experiment in the
> pipeline (thanks to an earlier post :-) )
> Regards Charles

I missed that post somehow. :/

There's some sort of limit to propane's heat, especially diluted
with air. It'll be interesting what you can do with it. :)

> Rusty_iron wrote:
> > Gday all,

Hmmm... if you're down-under my voltage problem may not effect you?

The scrap yard's always got lots of little blowers in old central
heat type furnaces, a good scrapyard will let you remove them and
sell them to you for scrap metal prices. :)

Alvin in AZ

Posted by Rusty_iron on August 23, 2006, 9:47 am
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alvinj@XX.com wrote:

>> Rust, got a little blower? Brand new ones ain't exactly cheap and
> the small ones I've found at the scrap yard lately were all 240v.
>
> Hmmm... if you're down-under my voltage problem may not effect you?
>
> The scrap yard's always got lots of little blowers in old central
> heat type furnaces, a good scrapyard will let you remove them and
> sell them to you for scrap metal prices. :)
>
> Alvin in AZ

Alvin, central heaters are in short supply here in subtropical
Queensland - Brisbane.
But we have plenty of airconditioners, so perhaps I can get one from
there.

Please post all your 240v units to Chilla and I, we use 240v here, like
the British :-)

I have a nice new blower I got off the shelf while I was OS about 2
years ago, cost $20 pacific peso's. Wish I'd got a couple of them :-)

I have power to my smithy, and a handcranked blower if I need it.
Portability would be nice and thats a good selling point. Thanks for
the idea, its important, I'd not considered it. DOH!!!!! :-)

Rusty_iron


Posted by Chilla on August 24, 2006, 1:46 am
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Rusty_iron wrote:
> alvinj@XX.com wrote:
> Alvin, central heaters are in short supply here in subtropical
> Queensland - Brisbane.
> But we have plenty of airconditioners, so perhaps I can get one from
> there.
>
> Please post all your 240v units to Chilla and I, we use 240v here, like
> the British :-)
>
> I have a nice new blower I got off the shelf while I was OS about 2
> years ago, cost $20 pacific peso's. Wish I'd got a couple of them :-)
>
> I have power to my smithy, and a handcranked blower if I need it.
> Portability would be nice and thats a good selling point. Thanks for
> the idea, its important, I'd not considered it. DOH!!!!! :-)
>
> Rusty_iron

Mitre 10 has a Fathers day special a 1 hp dust extractor for $99 AUD,
just use it to blow instead of suck (I don't know about you guys, but
I've got a dirty mind and this somehow sounds filthy :-) ).


Regards Charles


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