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Posted by Charles Ping on June 29, 2008, 12:25 pm
Please log in for more thread options 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
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> Some of you may remember that I bought an ex-school Flamefast CM350
> furnace from Manchester. After passng through many hands in a
> transport process it arrived with me in Suffolk.
> The furnace was natural gas and I wanted to run it on propane.
> Flamefast supplied new jet for £24. However for anyone else doing this
> I've just meausred the two jets. Small holes are difficult to measure
> (for me, anyway) but the natural gas one is 0.090 mm and the propane
> one is 0.065mm.