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[DoktaYut]

Something I hadn't observed in previous versions, and something that seems to happen a bit unevenly between fortresses, but here it is.

I have the custom to start my metalworking industry by rushing the magma sea and setting up the various furnaces and the forge there after a bit of channeling. But now, I've had to go back to coal as the open space needed, that opens up to the magma, occasionally seems to puke up 1/7s of magma into the forges, with varying frequence. First time I observed this it was only once, and since I had channeled into one of the magma sea's ramped walls rather than open, magma-filled space, I assumed it was that. But the next fort I had had it happen so damned often shallow pools of lava were covering everything. It didn't happen often enough to flood the room, but just enough to make sure a thin layer of magma was covering the workshop and bits of the surrounding area.

In retrospective it may be related to having built the room close to a magma pipe. Still, has anyone else observed this?

[cochramd]

No idea what you're talking about. Try building the impassable blocks of your forges over the magma channels next time.

[Libash_Thunderhead]

Magma flows which means there are ripples and waves. I don't know what disturbs it but it happens in underground lake, so I assume magma sea are similar.

[DoktaYut]

Makes sense, though why the magma pipes remain oddly still despite that remains a bit unexplained, unless these ripples can't propagate much between z-levels.

I'll try the impassable block method, hopefully they actually plug the channel rather than simply being impossible to step into.

[Sutremaine]

With a magma pipe, the whole embark tile will bubble up magma so long as there isn't something in the way.

[hinric]

Magma flows which means there are ripples and waves. I don't know what disturbs it but it happens in underground lake, so I assume magma sea are similar.

Perhaps there is something below the magma sea disturbing it. You should send someone down there to check it out.

[Bumber]

With a magma pipe, the whole embark tile will bubble up magma so long as there isn't something in the way.

Do floor grates count as something in the way? I recently built an obsidianizer where the top layer of a magma pipe used to be. There's a single channeled tile that spewed out a bit of magma a short while after channeling, but hasn't yet again since I put a grate there. Maybe I'll wait a bit longer, but I think I'd better just use a pump, given the unreliability.

[Sutremaine]

There is nothing below the magma sea that will cause magma bubbling or flowing. If your embark doesn't have a magma pipe, then the magma will remain static until you draw some out. When that happens, magma will come in from the edges of the map, like water comes in from the edges of the map when you disturb the cavern lakes. If your embark does have a magma pipe, then a 48x48 tile area of your embark will bubble up magma as long as there's space above the magma flow.

If you make a 1x1 staircase from the surface down to the magma flow, right next to the magma pipe, that 1x1 staircase will (very slowly) fill with magma up to the level of the original pipe.

Do floor grates count as something in the way?

I would guess no, since up/down stairs don't block magma bubbles, but perhaps being buildings they act differently. Assume whatever the worst would be for your situation.

Why did you replace the top layer of the magma pipe with... something else? It's probably something to do with the obsidianiser, but I'm not sure what.

[MobRules]

Don't magma crabs shoot globs of magma?

Whatever it is that they are shooting, it makes it a good idea to have the impassible squares of the magma forge covering up the channeled magma hole.

[Bumber]

Why did you replace the top layer of the magma pipe with... something else? It's probably something to do with the obsidianiser, but I'm not sure what.

To keep magma crabs out, and also so I can put my magma workshops there. The pipe is right under my main stairwell, and there's a cavern lake within ten tiles of it, one z-level above. Seemed more convenient than tapping through the side.

[Bearskie]

Fascinating. I remember that bug where reclaiming a volcano site caused it to bubble over it's caldera, constantly spawning magma from a point 1z above and spitting magma everywhere (as though the refilling point was volcano+1z. Perhaps this is a magma pipe variation.

[Bumber]

It works through floor grates. Just got 7/7 magma in the tile, which then spread out.

OP says 1/7ths of magma. If it's not a full tile's worth, then maybe it's something else. Items falling into magma can create 1/7 splashes. IIRC, it might also be possible for modded reactions to produce magma.

[PatrikLundell]

Magma pipes are dangerous. As said above, the whole embark tile is magma generating, and I think magma is spawned at the highest level possible above SMR, up to the magma pool's top level to rain down. I also suspect such generated magma is capable of flowing sideways while still in the air, before falling, as I've gotten magma on a ledge just outside of the magma pipe one level above the magma (I intended to obsidianize the magma from the ledge via bucket brigade [sloppy thinking, as I should have known I would probably obsidianize the level above instead, due to magma generation], but the magma on the ledge was in the way). That area is now sealed off and forgotten...

[Saiko Kila]

If your embark doesn't have a magma pipe, then the magma will remain static until you draw some out. When that happens, magma will come in from the edges of the map, like water comes in from the edges of the map when you disturb the cavern lakes.

Unless you happened to draw from a magma pocket, i.e. incursion from the magma sea below. Then it won't refill, because the map edges are below the highest level from which you draw your magma.

[DoktaYut]

It works through floor grates. Just got 7/7 magma in the tile, which then spread out.

OP says 1/7ths of magma. If it's not a full tile's worth, then maybe it's something else. Items falling into magma can create 1/7 splashes. IIRC, it might also be possible for modded reactions to produce magma.

It's mostly because it's a large room full of workshops. The magma bubbles out fast enough to leave several tiles of 1/7 magma but not enough to actually flood the room before these dry (and are replaced).

Still, if it's the magma pipe that's trouble, I guess I'll have to dig somewhere else. That or block the pipe's top from the caverns so I can use that instead