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[deoxys413]

At suggestion of a non-playing, but familiar roommate, I wanted to rig my volcano so that a pump on the volcano's surface would make magma gush out of trenches lower down and coat the outside world with a lovely shade of !!red!!

I myself have not been able to get this to happen, however, instead I tore up a pretty good map in the efforts and just opened the magma and river into my fort to start anew somewhere else.

So in short: How I make magma pressurized these days?

[Thorus]

The almighty Wiki told me: "not being affected by pressure, unless pressurized by a pump".

http://df.magmawiki.com/index.php/Magma


Edit:



green -> pump
blue -> hatch
red -> magma

open hatch = fun on surface

[Kugala]

Magma (and water) can only be pumped to the same level as the actual pump.  You can't force it up a shaft.

If you want it to pour out of a ground level hatch, you need to have a pump higher than that (In a building or hill), then dig a downward shaft from the pump to below your output hatch, then dig over and back up.  Essentially making a J or U shaped tunnel from the pump to the output hatch.

[Thorus]

Thanks Kugala!

maybe i should go back to dwarven elementary school to learn more about dwarven pressure logic.

So this would be correct then?

[AutomataKittay]

Yes it would be 

Make sure you keep your dwarves away from the hatches, though, once it's running!

[Sandrew]

Pretty sure that only works for water. My workshops which tap directly from the top of a volcano (some 10 z-levels higher) never flooded with magma.

[Urist Da Vinci]

Shameless but relevant self-promotion:
Aimable Volcanic Eruption Magma Superweapon
also
http://mkv25.net/dfma/map-10096-flamegate

In this map, I had magma erupt through a choosable hatch on the surface via a pressurized magma network that spanned the entire map.

[AutomataKittay]

Pretty sure that only works for water. My workshops which tap directly from the top of a volcano (some 10 z-levels higher) never flooded with magma.

Magma don't have pressure unless it's pumped, which's why it's pretty safe to tap it. Not so safe if you're pumping it overhead! http://df.magmawiki.com/index.php/Pressure#Magma_in_a_U-bend

[deoxys413]

So it seems to need a reservoir as opposed to just slapping a pump on a volcano. I tried to test this earlier today, but forgetting that any FB spawned during the initial run of the fortress goes topside, so the subsequent testing team was slaughtered before they could even get settled.  Onwards to new locations!

Thanks for the clarification everyone.