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40d:Magma smelter
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The Magma Smelter is built and functions exactly like a normal Smelter, but uses magma instead of fuel* as a heat source. Your map must have a magma vent that you have access to, and you must physically route the magma so it flows under the site of the magma smelter, or build the smelter over the existing magma.
- (* Note that coke or charcoal are still required in the production of pig iron and steel, but as part of the reaction itself)
A magma smelter is designated and built exactly like a conventional smelter, needing only to be made of fire-safe materials (the construction screen says magma-safe, but any fire-safe material will work).
However, in order to operate, a magma smelter needs to be placed with at least one of the 8 outer tiles of the smelter one z-level directly above exposed magma of depth 4/7 or deeper, which requires that the floor at the respective tile to be removed or absent, for example by channelling. There does not need to be magma present when the smelter is built, but the channel must be dug in advance, because this cannot be done after the building is already in place. The game will not prevent you from mis-placing a magma smelter where it will not operate. The magma channel can be under the impassable tile (top center of the 9), but it does not need to be. Placing it there may help prevent magma-dwelling creatures from actually seeing and attacking any dwarves that may be working in the smelter, and prevent the dwarfs from seeing them, canceling any jobs and running in abject terror.
The circle on the top tile of the smelter will turn red when there is sufficient magma, or grey if there is insufficient magma.
Working - red dot
Not Working - grey dot
If magma falls below 4/7 for even a moment, the magma smelter registers itself as having insufficient heat to work for that moment. Even if the heat returns immediately, this cancels and removes any and all jobs, active or queued. This is common as sloshing magma first fills a tunnel beneath a magma smelter, as the smelter alternates between red and grey states while the magma fluctuates below 4/7 deep. Look at the magma in the area and wait for a steady 4/7 or more before counting on any jobs being completed.
A magma smelter cannot use conventional fuel if the magma is too low or absent.
Magma smelters do not use up or cool down any magma when in use, nor do they require a fresh "flow" - any source will work, so long as the depth is maintained. Magma does not currently obey pressure and seek its own level, so tapping a magma pipe from the lowest available Z-level will not cause all the magma above it to rush into the fortress through the opening in the smelter.
Magma can be very fun to work with - do some reading, plan ahead, and get it right the first time.
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