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[skullman]

Hello everyone,

So I've been playing DF for a while now and am familiar with almost all aspects of the game. I have had numerous forts with magma forges and smelters but this time something unexpected happened. I have looked around and haven't found any posts related to this so I apologize if this has already been covered.

My problem in that out of nowhere magma started boiling up through the channels I made for my magma smelters and forges. Now I've had these things operational for some time and randomly they just started spewing out magma. As a result two of my best dwarves were killed and the room is slowly filling with magma. Anyone know whats going on?   

[AutomataKittay]

I can only think of two things. That the channel was over open magma sea, and magma are bubbling up through uncovered hole ( impassable workspace covers it ). Second that it's pumped magma and the pump is at or above the magma forge area.

[FuzzyZergling]

Are the channels below the highest level of the magma?
I had the same thing happen to me when I tried to make forges at the magma sea, with a magma pipe leading up to the third cavern.

I'm not sure what would be causing this, but if I had to guess I'd say it has something to do with how magma pipes and volcanoes refill themselves.

[skullman]

Ok then that must be the issue. I channeled over the magma sea but below the pipe. For a good while things were fine but now... I'll relocate to the top of the pipe. Thanks guys

[Bandreus]

Yep it's because of the pipe.

Magma isn't affected by pressure like water and won't rise up z-levels on its own unless it's pumped or a pipe is present.

http://dwarffortresswiki.org/index.php/Magma#Properties_of_magma

[AutomataKittay]

Are the channels below the highest level of the magma?
I had the same thing happen to me when I tried to make forges at the magma sea, with a magma pipe leading up to the third cavern.

I'm not sure what would be causing this, but if I had to guess I'd say it has something to do with how magma pipes and volcanoes refill themselves.

Pretty much it, yes, I've seen it called 'bubbles' by others, it seems fitting name when it pops into the room. I've watched and tapped volcanoes and magma sea, they always pops up around 1/7 to 3/7 of fresh magma randomly above the flows. It makes accidental taps into magma sea from above a bit fun for me

[Sutremaine]

In an embark without a magma pipe, you can channel into the magma sea anywhere and it won't burst up. In an embark with a magma pipe, the 48x48 square that the pipe occupies will sporadically produce magma, up to the level the pool was at upon embark.

You can also check it out by using DFHack on an embark with a pipe. Drain all the magma using the liquids command, and then see how the magma re-enters the map.

[skullman]

Alright, wont make that mistake again. One other thing that is off topic but I can't seem to find the answer elsewhere so I'll ask it here. Hopefully someone can point me in the right direction.

I just discovered Masterwork and I love it. Though there are no cats... Now I've read that cats as well as other "Human" pets were taken out and replaced with more dwarven style animals. But what animal in Masterwork functions as a cat? That is to say what will kill all those annoying little critters now?

[FuzzyZergling]

I don't know anything about Masterwork, but in vanilla birds of prey will kill vermin as well.

[Repseki]

Moleweasles will hunt vermin, and breed like rabbits...