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[WrathNail]

A single step in magma does not lead to burning/fat melting off. So even digging a normal tunnel gives your (legendary) miner enough time to get out of there.

That is... IF he tries. I've had miners just stand there and bleed to death like a deer caught in the headlights. Only replace "deer" by "dwarf" and "headlights" by "advancing wall of doom magma"

[Vehudur]

A single step in magma does not lead to burning/fat melting off. So even digging a normal tunnel gives your (legendary) miner enough time to get out of there.

That is... IF he tries. I've had miners just stand there and bleed to death like a deer caught in the headlights. Only replace "deer" by "dwarf" and "headlights" by "advancing wall of doom magma"

At least we don't get these* in game (yet, probably).

*That is more dangerous than it looks.  I could go on and on about them being insanely hot, but instead you can just watch this.  Near the end is the same thing, just at night.

[McDwarf]

Code: [Select]

MMMMXXXX
MMMX   S
MXXXXXXX

or

MMMMXXXX
MMMMXXXX
MMMM XXX
MMMMX  S
MMMMXXXX

M = magma
X = wall
S = stairs
I usually breach diagonally, with a task designated elsewhere so the miner knows where to go when the magma starts to flow. I usually don't lose my miner.   

[Osmosis Jones]

I'm not sure about the comparison between 40d and the current version's flowing speeds, but water and magma definatly do NOT flow at the same speed, regardless of pressure. Magma is a LOT slower, which makes sense, since magma is supposed to be very thick molten rock.

I can guarentee that they do in fact flow at the same speed. Go to the arena, there are two 2-tile wide channels that run N-S parallel to each other in the (IIRC) upper right corner. Fill one with magma, one with water; they flow at IDENTICAL rates. Water can appear to flow faster when drawn from a brook or similar, or when there are multiple z-levels involved. In both cases this is merely an illusion created by teleporting water (whether from the brook source tiles or the above z-level).

The more you know


RE: the OP; I must admit I gave up on side breaching pipes after 2010 came out. Now, I obsidian cast an inverted pyramid into the top of the pipe as far as possible, build a pumpstack with intakes on every submerged level, and collapse the cast. This allows me to instantly drain ~4-6 z-levels of magma, and with a large enough pumpstack, drop it all outside in one hit

[SkyRender]

Lava flows slightly slower now IIRC, I've tapped volcanoes quite a few times since 0.31 came out without having to sacrifice any miners.

Oh, definitely.  It only flows particularly quickly if you expand the size of the breach; e.g. a two-tile opening will fill a room faster, but a single opening is slow enough for dwarves to safely escape.

 I kind of doubt that, unless Toady's flow models are messed up (and I remember quite distinctly they were not in 40d).  In standard fluid dynamics, you get a faster and stronger flow in a smaller space.  To discover just how devastating a small-opening flow channel can be, have a Dwarf man a water pump that will draw them into a channel and watch as they get sucked by the flow at four times their normal speed and die from colliding with an object.  As Quietust pointed out, the flow mechanics are identical for water and magma in DF, too.

[Gearheart]

Speaking of magma flow speed, would breaking into a pipe using an upward [r]amp make a tunnel fill with magma more quickly due to two tiles flowing instead of one?

[Osmosis Jones]

Possibly for filling the first tile. After that though, it's gonna move at exactly the same rate.

[Gearheart]

Ah, so having multiple z levels of lava open to a 1 z level tunnel has no effect?

[jei]

I usually channel/dig a diagonal ramp from above that will let the magma flow in a channel 1z level down. No fatalities so far.

Used to be volcanoes had variance in their XY-planes in Z-axis in 40d. Toady should return this in 2010, so volcanoes can be safely breached in deeper parts too.

Probably a bug. Haven't reported.

[Lord Aldrich]

Ah, so having multiple z levels of lava open to a 1 z level tunnel has no effect?

Correct, once the lava is inside of the tube. It's because the lava doesn't teleport like water does, so you get structures like you see Toady explaining here:

http://www.gamasutra.com/view/feature/3549/interview_the_making_of_dwarf_.php?page=9

The lava plugs up the tube, and more lava can't fill it until the first bits move ahead at their fixed flow rate. Bigger tube = more flow = faster moving lava.

[Levi]

I consider the mining into a magma pool a test of dwarven mettle.  If he can't avoid being melted then he wasn't a very good dwarf.