At what temperature would a small gas forge get up too.
Thankyou in Advance

It's been a while since I made the calculations, but the theoretical temp for combustion of propane is around 2400 degrees F. Depending on the lineing and air mix you should expect 2300 plus or minus. As I say, I'm trying to recall, so I don't mind being corrected.

Flame Temperatures some Common Gases

1980 degrees Celsius = 3596 degrees Fahrenheit
This is the theoretical limit assuming perfect insulation, optimal fuel/air mixture and no other losses.

2000-2500 are reasonable real world results for home made forges, depending on burner size, fuel pressure, insulation, insulated cavity size, and opening size(s). I think a good design can achieve 3000F or better without epic effort.

Phil
PS, this is using numbers for Propane

Edited December 4, 200916 yr by pkrankow

This is really not a question that can be answered. Think of it like aksing how much does a ford vehicle weigh.
If you were more specific about what kind of forge, what kind of fuel, how big, what kind and how much insulation and what kind and how many burners if it is a gasser, and maybe evenmore specific if it exists and does not meet your needs, fill in the above blanks and let us know what kind of problems you aer haveng with it and I bet someone with forge eqqpeience may be able to give you a better answer.

You are right Rich, and I should have specified that I used the number for Propane.
Phil

I've seen claims by people with atmospheric forges that they get 2300 – 2400F checking with a pyrometer. And then they say “See, it gets to welding temperature”! I've checked my forced air forges with a properly calibrated optical pyrometer and the results I get running at what I consider a “welding heat” were 2800 – 3000F. Given that heat transfer is a function of the square of the temperature difference between the two bodies, I can get my parts to welding heat a whole lot faster. That is very important in forge welding. Waiting and waiting and waiting for a piece to get to equilibrium with the forge makes welding much more difficult. On the downside, I always had to use 3200 degree refractory.

Hello,

Well-done for all your contributions, it has helped a lot. My question is how many forge burners must I combine to power a 1800 degree Celsius furnace. I initially thought two will be ok but it can only give 1200 degrees. 

thanks

David

 

What size burners, and what size furnace?

Welcome from the Ozark mountains. An 1800° C = 3272° F, is an awfully hot furnace. What is it's intended purpose? Most metals will melt at 2900° F 1593° C or lower.

Without knowing more about your forge and burners I have to resort to guessing based on an average. 

If 2 burners bring your forge to 1,200, 3 burners might bring the same volume furnace to 1,800. Provided your burners are performing properly.

That's just an educated guess mind you, fill us in on some of the details requested above and we'll have something more meaningful for you.

Frosty The Lucky.

I'm not sure about what he has, a forge or furnace. Posted in a 13 year old forge thread asking about forge burner's and then called his a furnace.

I can't control the wind, all I can do is adjust my sails. ~ Semper Paratus

A forge is a furnace, forge is just a type name.  My above response is the only guess I'm willing to make without SOME info.

I think we're also dealing with a translation program and an unskilled user. 

It occurred to me last night that I can't control the wind either so I just let it pass. 

Frosty The Lucky.

On 12/4/2009 at 6:10 AM, pkrankow said:

I think a good design can achieve 3000F or better without epic effort.

Good forge designs have reached 2750 F, with an excellent burner. I believe 3000 F, when burning propane would be epic. However it only takes a good design to reach 3000 F, burning propylene.