| Re: gas forge problems||Hits: 1137|
Michael Allen Porter [Dr.Frankenburner]
on 10/26/05 03:29pm
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|To Michael Tomasino and others:|
It looks like I'm very late replying to Mike's question. So late in fact that this reply must be reduced to an offer to address whatever burner questions are left open at this time.
It should be noted that the burner and its equipment form an interactive system, which means that burner problems are often found to be a problem with the forge, rather than the heat source.
It should also be noted that gas burner designs and the available materials/equipment for forges are still evolving. For instance, as little as a year ago, alumina bubbles were almost impossible to find at a reasonable price in amounts small enough to interest craftsmen. This is no longer true, and the difference is going to have a great impact on forge designs. I predict that it will marginalize ceramic fiber use in the next two or three years. This will be more true of shop forges than portable types.
Gas burners are also still evolving. Although my designs permit total primary flame combustion (if the burner is built according to instructions and properly adjusted--most people feel that near total primary flame combustion is enough to suit them), anyone with a lathe can improve even this performance; the more nearly perfect the burner's construction, the smoother its performance. Smoother performance translates to a greater turn-down range and lower gas consumption (I have found lathe turned accelerator/end caps allow me to drop down one full orifice size, with performance that is just plain sweet).
Finally, it should be noted that most existing burners can be retrofited with gas accelerators (simple MIG tips), bringing their performance way up--not to total primary flame combustion--but to a whole lot better performance level than their original designs permitted. Unfortunately, gas pressure usually has to be reduced afterward in order to preserve the forge insulation. So, improvement is mostly limited to fuel consumption figures, rather than increased forge performance. Otherwise, the heat increase is likely to "gut" the existing forge linings. However, the improvement is also likely to end the problem of "blue exhaust flames" which is a sure indication of incomplete combustion, resulting in raised carbon monoxide levels.
Michael Porter (author of "Gas Burners for Forges, Furnaces, & Kilns" AKA Dr. Frankenburner)
Michael Tomasino wrote:
> I have a venturi style gas forge that I have recently started using after taking a blacksmithing class. I have a problem where one jet will not produce a good flame. The flame is erratic and when it is there is blue only where the work is. You cannot see the flame at the top of the forge. I'm trying to get a good welding flame from it. The forge is a two jet model, that I purchased from ebay about a year ago. I would appreciate any help with the problem.