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Posted by Andrew Mawson on June 29, 2008, 2:19 pm
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> On Sun, 29 Jun 2008 17:25:49 +0100, Charles Ping
>
> >On Sun, 29 Jun 2008 17:07:21 +0100, Duncan Munro
> >
> >>Charles Ping wrote:
> >>> On Sun, 29 Jun 2008 14:49:44 +0100, Duncan Munro
> >>>> Charles, that sounds like very small holes indeed. When I
knocked up my
> >>>> propane burner to run off 30 PSI, I ended up going with a 1.00
mm jet
> >>>> size. What gas pressure are you running?
> >>
> >>> Flamefast reckon 35mBar - a hell of a lot less than 30psi
> >>>
http://www.flamefast.co.uk/heat-treatment/crucible-furnaces-cm350.html
> >>>
> >>> So either yours is one big old burner that will melt iron and
keep
> >>> Gazprom's profits high or the Flamefast furnace is very
efficient.
> >>> Possibly something in the middle.
> >>
> >>LOL! I'll think of Chelsea buying another player every time I fire
the
> >>burner up ;-)
> >>
> >>I had a look at the flamefast link, it shows 29000 BTU/hr or about
a
> >>quarter of the output of the burner here, but I'm still curious
about
> >>the massive difference in jet sizes.
> >>
> >>Here's a link to play with:
http://ronreil.abana.org/design2.shtml#BTU
> >>
> >>Scroll down to "BTU calculator" and there's an excel spreadsheet
you can
> >>download which works out BTU, jet size, flow, etc. If you key in
your
> >>jet size (it's imperial so 0.065mm is about 2.5 thou) and even
with 30
> >>PSI, there's not a lot coming out....
> >
> >OK, so you've conclusively proved that I measured the hole wrongly!
> >What I'll do is search for some wire that *just* fits in the jet
and
> >try again.
> >
> >Charles
>
> Doh!
> It's imperial not metric
> 0.090" and 0.065"
> Why didn't I spot that a the jet wasn't thinner than a human hair!
>
>
> Charles
My Flamefast ceramic chip forge uses a venturi to suck the gas through
the jet. Forced air from a blower enters the venturi which ceates the
negative pressure and sucks in the gas through a special demand valve.
No blowing gives no gas so it's fail safe. However I would assume that
this set up mucks up jet size calculations as the set gas pressure on
the regulator is not the pressure difference that the jet sees. Maybe
yours is similar?
AWEM
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