100K burner to forge size for forge welding

[andrewh2011]

Im looking at buying the atlas 100k burner and using a freon tank as the forge body.

It is ~9.5 inch diameter so with 2inches of kaowool i should be looking at 5.5 inch inside diameter before applying satanite.
How thick do i want to apply the satanite?

The tank is ~13 inches tall so the inside length would be about 9 inches after kaowool and before satanite.

From what ive read this isnt enough btu/ cu inch to reach welding heat.

What do you guys think?

Would i be better of with a different forge body?
I have a couple 7 inch diameter cylinders but that would only leave a 3 inch chamber

And what is the smallest Inside diameter you guys would consider to make medium size damascus billets??

 

[Atlas Knife Company]

Well, luckily the Graham burner is actually about 108k BTU, regardless it's still more than you need. A 9" long chamber is ~470 BTU per inch @ 100k, and 400-450 is the general guideline. Don't forget to account for the volume of your hard firebrick floor if your going to weld with flux. I just welding up a 5 layer billet of san-mai in an Atlas last weekend, 2.5" chamber and it was perfectly welded and fit nicely in it. Dry-welding works great!