Attached are some PDFs of the working plan so far.
the current plan for insulation is around the walls 3 1' rigidised blankets of ceramic fiber, followed by a 1/2 layer of castible refractory, (Satanite 55 is what i have available, 3200F rated) and a kilm wash.
1/2" castable on the surface that mates with the lid,
and as for the floor I am unsure of what to use but I would like to do about 4" of material and finish with castable, at this stage
This leave me with a 5 25/32" diameter chamber, also 5 25/32 deep as I read here a relatively equal height to width is generally advantageous.
The final volume is approx 153 cubic inches.
In the plans I have used 3, 1/2" naturally aspirated T burners based on @Frosty design mounted vertically, with a 2 degree upwards angle to assist with creating a vortex.
I expect with that volume 3 burners, even half inch, is overkill. The addition of that third burner (And very possibly the 2nd) will be under the point of diminishing returns for effort, however if I could get a couple of hundred degrees out of each of the 2nd and 3rd that would be ideal. Based on my current forge and melting experience and plenty of reading (yet I'm still sure not enough) I'm hopeful that will give me the temps I need to make crucible steels, with out having to tip over into the greatly less convenient options of blowers or solid fuels, as I said in the original post, I am space poor, and poor poor.
I also intend on plumbing the burners so that each is individually isolate-able for lower temp metals, and can run off of multiple fuel sources, to eliminate pressure drop concerns at the end of bottles, pump more pressure in for really high heats and minimize temperature loss during bottle exchanges.
Also in the design, my lid. 3" deep. I currently have my exhaust hole at 4.5" diameter. I honestly had no idea for this one, other then lots of pressure involved with three burners.
The mechanism for the lid is just a place holder, something simple and similar will be nice but I can probably cross that bridge later. Similarly to the stand.
With tall that said I do have some more specific questions,
How should I insulate the floor, space fill with brick/blanket then castable, all castable, bit of all three? And should i do walls first then fill the bottom, or floor first and build the walls off of it
What size exhaust am I looking for? Can always partially obstruct with brick but cant make bigger.
When building the burners for something with so much insulating thickness, how far in do I mount them, the tube length as per Frosty's recommendations would be 4" (8*burner diameter) should those 4" explicitly start out side the forge, or close to the holes into the chamber. In my diagram I have split the difference as i was unsure. Also, how should I flare the end, if necessary, in relation to this question.
And lastly, I'm almost scared to ask, can I get away with the T burners, I know completely well that they are not ideal, but if I am able to really push them and get the temperatures up there I'd be much happier and comfortable using them, even if I swallow gas far too quickly and have to replace my castable every time I do steel (which wont be too often) if it is possible I'd like to try and make this work. But you guys have the knowledge, hence why I ask.
If I cant get that to work I might need to give up on crucible steel this build, just to paint the position I'm in.
And I doubt it but while here, can I get away with 2? Thoughts?
I know the diagrams are a bit of a headache but I just wanted something up, will answer any questions if you'd like.
foundry initial 12-06-2020.pdf img20200612_17181938.pdf