Freezing tanks

[Groucho]

I,m trying to forge two metals together and I am having trouble with the tanks freezing up when I get the temp. Up over 2000 degrees for an extended time. I was using a 25 lb. tank. Do I need a 100 lb. tank or do something different with the one I have? Is it a volume thing?
Thanks

 

[Bruce Bump]

The bigger tanks won't freeze up. You can set your small tank in a barrel of water to keep it warmer or hook two small tanks together. My 100 pounder never freezes.

 

[GHEzell]

I have 2 tanks and swap them out when one freezes up, but a larger tank, as Bruce said, would be ideal.