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[KaguroDraven]

Ok I have found what could be the perfect map. Access to iron and flux. Lots of trees incase I can't find other forms of coal. Magma. Access to every other civ. And the mountain itself forms a perfect entrace for my fortress, a large circle with a small pincer. I removed all the ramps inside the circle, and soon I'll floor up the above area. The problem is that my magma is at the very top of the mountain, completely uncovered or guarded by anything. How can I tap my magma without haveing it overflow into my entire fort? My idea is to channel to magma to a wide open area, and use a floodgate for if it gets too high. But I don't know if this is completely safe or not, or worse if the magma might overflow the channeled area.

[Gearheart]

Magma has no default pressure, and volcanoes do not refill above their limit.

Just break or fortify the side of the volcano to tap the magma.

[Angry Bob]

Destroy the ramps to the summit, make a fortress in the mountain, with a closed stairway to the summit. Create a system of channels attached to the summit, either at the same level or one above, so you can either just channel an inlet or pump the magma into the system.

And no, magma doesn't pressurize or overflow in ordinary circumstances.

[Tsarwash]

Would it be possible to pressurise a volcano ? Maybe by pumping magma back in a few levels down. That would be great fun.

[bdunwithat]

Would it be possible to pressurise a volcano ? Maybe by pumping magma back in a few levels down. That would be great fun.

Pumps make magma behave as if it is pressurised. May or may not be a bug :s

[Tsarwash]

That sounds great to me, a proper erupting volcano. I wonder if anybody has done this yet.

[Vehudur]

Would it be possible to pressurise a volcano ? Maybe by pumping magma back in a few levels down. That would be great fun.

Pumps make magma behave as if it is pressurised. May or may not be a bug :s

With that in mind, pump magma up from as low as you can to the top of the magma pipe.  Preferably with at least a dual pump stack (two pumps per level) for extra magmatic fun.

[Shoku]

Would it be possible to pressurise a volcano ? Maybe by pumping magma back in a few levels down. That would be great fun.

Pumps make magma behave as if it is pressurised. May or may not be a bug :s

It's not a bug. When water sits on 7/7 water it just automatically looks for the nearest open space on a lower level and moves there. Magma does not do this thus no pressure.

Pumps do something slightly different. They take the fluid from their input tile and move it to the nearest tile from their back end, on the same level or lower. Just like pressure except if the magma was really pressurized the whole volcano would sink in to the level of pressure filling up some ridiculously large space very fast. The magma isn't doing anything, this is just how the pump moves fluids.

[Namfuak]

If you wanted to utilize the top, you could also just build walls around it.  But I think putting pumps at the top that are connected to windmills would be pretty beastly.  Especially if you planned it so that there was only a path from the edge of the map to your fortress entrance, and the rest of the area was burning hellfire.

[Lytha]

How can I tap my magma without haveing it overflow into my entire fort?

You may have to use the very old technique of scratching a fortification into your volcano pipe. Okay, let's do a step-by-step.

- dig a tunnel below your future magma workshops and then tunnel your way towards the volcano pipe.
- get some magma-safe floodgates, grates and levers ready.
- position the floodgate at the end of your tunnel, directly next to the volcano pipe.
- connect it to the lever
- put a dwarf into the room of the lever.
- have another dwarf smooth and fortification the magma pipe. Just one tile of it, else he'll burn to death
- while he's carving the fortification, give him another engraving job somewhere else so that he won't linger and get burned to death
- as soon as the magma is pouring in, have the lever pulled
- now you need to wait a short while until the magma has evaporated
- then place a (W)allgrate behind the floodgate
- feel free to construct another wall behind the wallgrate and to carve another fortification into it
- feel also free to place more wallgrates
- and then let the magma flow in. This should be safe against all magma critters. Magma men can't really fit in through the fortification; and the smaller ones can't destroy the grates or the floodgates.


If you want to have more magma than just for your workshops, poke the volcano pipe some more with the same technique.

[fivex]

Pumps do something slightly different. They take the fluid from their input tile and move it to the nearest tile from their back end, on the same level or lower. Just like pressure except if the magma was really pressurized the whole volcano would sink in to the level of pressure filling up some ridiculously large space very fast. The magma isn't doing anything, this is just how the pump moves fluids.

Except for the fact that pumped magma causes magma to act like water.

[KaguroDraven]

Apparently my dorfs somehow tapped the magma pipe with a channel before I could get the flood second gate up. The magma won't move above the bottem level, it won't even go up the ramps that remain. The first floodgate was just blocking rhe magma from getting into the rest of my fortress, it seems there is no need.

[celem]

The magma won't move above the bottem level, it won't even go up the ramps that remain.

This is lack of pressure in action.  Despite the z-levels of magma sitting above the inflow it wont push down and cause a u-bend affect (rising magma).

As people have mentioned water is pressurized (as can magma be under the conditions mentioned above).  In that case i believe it rises the the same level as its inflow +1