Rather than worrying about damaging the steel i'm working with, i'm worried about heat damaging my forge. I don't want to turn around, hit a hot piece of metal, then turn back to find my forge melting into a pile of molten hopes and dreams. If I'm careful, bad things shouldn't happen right? But they do. What signs in the lining can I look for to tell things are going downhill?
A coal forge is a no go for me. I have enough screwing with my breathing. As for now, tools are what i'll be forging. Tongs, punches, drifts, and so on. Maybe a fence? Things to anchor down a three inch hose. etc. Lots of hobby items like customized (and over sized) chess pieces, gears for steam punk type creations and whatever else. Swords are cool, but until my kids grow older and learn more self control I won't be messing with that. (Tools are much less interesting than swords, trust me)
Another reason I chose a gas forge is because I'm a Hot Oiler and very familiar with the use of propane. (I use 48 burners inside a big box of lined steel to heat a steel coil that I pass crude oil through. I maintain it well) I'm just not accustomed to high temperatures like this. I have an infrared thermometer I bought for work I plan to use to maintain my forge at temperatures under 2300 for now. Naturally I need to be very careful in my work, and I'd like to be as careful with my forge. Things can get out of control quickly.
The forge constructions hasn't even begun yet. I'm still planning it. I chose that particular interior volume because it is near the volume of the two burner forges that Diamondback Ironworks sells. And you know, I would feel more manly and satisfied with my life if my forge had two burners.
I've done as you(Frosty) have suggested and installed a couple of valves on my burners so I can have either one on or off at a time. Since my forge isn't reality yet, I can do whatever I want with it. So when you say to partition the forge, did you mean to effectively decrease the length of the forge by whatever measurement, split the forge into two sections, or just to not create an opening in the back end at all?