[TheForge] WHICH Harris torch for propane?

[James Binnion]

Paul,

According to the Harris catalog natural gas at 4 oz will work on these type mixer/torch combinations.



Here is what Harris has to say about it:

"“F” or low pressure injector mixers require that only the oxygen has a positive pressure control. The oxygen exits a specially designed chamber at a very high velocity which causes the fuel gas to be aspirated into the mixing chamber. Because of the aspirating effect on the fuel gas, positive control of the fuel gas is not required. In fact, the mixers in the Harris Calorific line are designed to operate at fuel gas pressures as low as 4 ounces. “F” mixers tend to produce a more homogenous oxy/fuel mixture because of the high turbulence in the mixing chamber. This feature is most important when using the more difficult to mix alternate fuels. “F” mixers tend to have a narrower operating range than “E” mixers but because of their superior mixing capabilities they tend to maximize BTU output within that range.

“F” mixers are used primarily with low pressure natural gas. However, they are also recommended for use with alternate fuels when maximum BTU output is needed and / or positive pressure control of the fuel gas is not available."




On Jul 18, 2013, at 4:20 AM, Paul Sperbeck wrote:

> It just occurred to me that the greatest value of the AllStates torch
> (sorry I referred to it as a Mid States... no slight intended) might be
> to those of us that have access to natural gas systems.
> 
> With the venturi mixing chamber able to actually produce suction I
> wonder if the AS torch could be used with 'city gas' which is typically
> supplied at 1/4" PSI (7"WC). Most residential gas meters are limited to
> about 400CFH which roughly translates to 400,000 BTU for natural gas...
> OK if you don't need to run the furnace or the range. Sure would cut
> operating costs. Natural gas is much cheaper here in Wisconsin.
> 
> paul
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> 
> On 07/18/2013 01:11 AM, Peter Fels & Phoebe Palmer wrote:
>> On Jul 17, 2013, at 8:00 PM, Jerry Frost wrote:
>> 
>> REV Frost?
>> 
>> Demand regulator jibes with Meter, The All States meters the propane flow as needed. Demand regulator sounds like the same thing to me. Meters the flow is how Lyle explained it to me.
>> 
>> Good.
>> 
>> Paul just mentioned his Smith rosebud puts out that kinda heat.
>> Perhaps the AS heat output isn't all that novel?
>> If, as Jim says, the propane specific difference in the Harris/AS
>> lies in the LP designed mixer, and not in the torch body..
>> Then the LP mixers on all modern torches ought to be quite similar. No?
>> 
>> Rev?
>> 
>> Yeah; I just judged you worthy;. You'll have to print up your own diploma.
>> Mine is left over from the 60s.
>> 
>> Jer
>> 
>> 
>> On 7/17/2013 5:55 PM, Peter Fels & Phoebe Palmer wrote:
>>> Hey Rev Frost:
>>> The 450,000 BTU is presumably per hour,  and comes from the AS promo video on their site.
>>> Poking around the web, most rosebud ratings i saw were about 1/2 that.
>>> The site refers to the propane regulator as a "demand regulator", if i remember right.
>>> But i think most all pressure gas regulators are demand regulators, like SCUBA regulators.
>>> I'm not sure what the difference is between that and what you refer to as a propane"meter" is.
>>> Help me on that please.
>>> Clyde's Harris guy didn't seem bothered about the difference
>>> and Jim Binnion seems satisfied with his 2 stage reg.
>>> Does it really need to be a special regulator to work optimally?
>>> 
>>> 
>>> On Jul 17, 2013, at 5:45 PM, Jerry Frost wrote:
>>> 
>>> The only gaugeless reg is the propane meter, though the oxy only has a little popup gauge and is set by a vernier. When you say 450,000BTU in what time is that? You hear a lot of marketing jazz that doesn't really stand up, for example, saying your furnace burner puts out 100,000BTU doesn't mean anything unless it's 100,000BTUs/hr.  Of course I may have just missed it, I haven't been following the thread very closely. I've been waiting for the BONANZA!! to jump in. <grin>
>>> 
>>> Truth is Propane has more BTUs than folk think, it isn't as HOT as acet but it has more BTU's /gl. I know I can crank my propane forge to melt the fire brick liner hot and keep it there for 6-7 hrs on less than 2 gl. of propane and that's running atmospheric air, not oxy. The hard fire brick I use is 3,000f+ working temp and I can melt it in my forge. My rose bud will slag it in a few seconds, the surface ripply, glassy and being blown around by the flame while the the heat hasn't penetrated 1/2".
>>> 
>>> Sometimes I wish I'd taken that dealership when Lyle offered it, I might've been able to answer some of this without speculating so much. Oh well, I'll continue to watch and hope for the best.
>>> 
>>> Jer
>>> 
>>> 
>>> 
> <snip>
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James Binnion
jbin at well.com