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I Forge Iron

Building my first gas forge , critique my ideas


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Hi , let me start saying my english may not be good enough , so let me know if something is not clear . 

I been forging with my charcoal forge for half a year now , but wanted les time consuming , so i'm starting my first gas forge build.

Resources are not really available in Argentina , so I been doing some research and trying to pull out some design that may work with what I have.

First gas . Propane is too expensive here so , it has to be methane. People here use bottled methane for their gas forges , and works pretty well but a 10kg bottle is a bit out of my budget so i'm gonna give a shot at a natural gas forge. From my research a gathered 2 thing about Natural Gas , is not that hot , and doesn't have much pressure, so insulation and burner performance are key ( as in every other forge , i know). For this reason  I've chosen a Forced air Ribbon burner.

Now , insulation , I know you probably are not gonna like this . For my insulation Im using K-26 insulating brick and that's it . Being my first build I didn't want to spend much so I bought 8 k-26 bricks( the factory gifted me 3 extra so I have 11 ) , and 10kg of 60% alumina castable refractory to coat the inside .

The build . my idea is making a box forge with 6 bricks (2 for the sealing 2 for the floor , 1 for each wall ) and cast a 1/2 inch in the interior. The box made with the bricks ( without the refractory ) would have a volume of 161 cubic inches. For the burner my first idea was to cast it in refractory but then I had the problem as to where attach it to the forge , and the fear that it will lose to much heat because it will have no insulation behind it , so my new idea is to carve one of the wall brick , drill it and insert the plenum there , and then seal it with refractory (I thought high temp silicon my work to ) and make some kind of support so it doesn't puts to much stress in the brick an the refractory .

the forge is rather small so I was thinking of a plenum of 2x2 inches with a 3/4 mixing tube . I am under the impression that more flare holes will make shorter flares , so i was thinking of making as much as I can , without surpassing the 13:1 ratio for the burner block , and without surpassing the area of the mixing tube , to not lose pressure.

So let me know what do you think 

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While the BTUs per cubic centimeter is lower for natural gas;  a blown ribbon burner should allow you to dump enough gas into the system to forge well with it. If it is designed well.

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6 hours ago, ThomasPowers said:

While the BTUs per cubic centimeter is lower for natural gas;  a blown ribbon burner should allow you to dump enough gas into the system to forge well with it. If it is designed well.

I got that one

 

1 hour ago, Mikey98118 said:

Any good gas forge works as a reflective oven. With natural gas for a fuel, your forge will need a re-emitve  coating even more than with propane.

I was hoping the refractory to be enough . you are referring to the kiln shelf you guys talk about a lot right? I get what the thing is ( I believe ) but I have no idea where or how to find it here (Argentina)

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I did my  search again , and found something whit the name of zirconium refractory painting , but I couldn't find it to buy here . I there any way to make it myself?

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1 hour ago, Mikey98118 said:

Do you have pottery supply stores locally? Because there is a common ingredient for glaze that will do a fine job...

Yes , I do. What would be the ingredient?

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Zircon is the generic name for zirconium silicate, the trade names are different (for example, Zircopax, Zircosil). A formula of 95% zircon and 5% Veegum (or bentonite clay if you can't get the preferred ingredient) makes an excellent re-emissive coating.

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