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[Lagren]

I've had an idea for a project- a truly dwarfy tomb for true dwarfs. However, I'm not sure if it will work.

I've built a 9x9 tower directly over a volcano's magma-filled crater, accessible only by bridge,  and now I want to extend the tower downwards by pumping magma from the pipe. (Like you would pump out water from a multi-level aquifer.)

However, I'm worried that I'll get magma leakage and end up frying my masons, since with an aquifer you can ignore 1-deep water... but 1-deep magma is deadly.
Has anyone tried anything like this before, and is it possible to do?

Also, where should I place pumps? I'd think I'd want to place pumps all around the perimeter of a 3x3 square (or a 10x10 one) so that the central tile/s would have no magma in them at all, but I don't know whether the central tile/s would lose their magma or continue to refill with magma from below. (Since magma doesn't have pressure like water does, it shouldn't flow upward… but it's in a pipe, which is generating magma IIRC.)

The major problem I'm seeing is that I'll need to make the top level a lot larger, since every level I go down, the whole thing shrinks by 2 or 3 squares in all directions… unless I can figure out some way to get the magma outside out of the way without flooding the inside of the tower.

Maybe I could place a central channel in the tower that drains the magma back into the pipe, or something like that? Once again, I don't know if that would work, but if it does, then it  could double as a crematorium for the most honored members of the fortress, making the whole thing even more awesome.

If the whole thing ends up being possible,  I plan to engrave all the walls and floors of the thing and line the walls with alcoves containing coffins.

Can I get some advice on whether this is feasible and/or dwarfy enough?

[Scruga]

what you could try is pumping from the bottom;

Code: [Select]

PUMP|MMM|
PUMP|MMM|
PUMP|MMM|
PUMP|MMM|
PUMP|MMM|
 PUMPMMM|
it would empty the thing from below allowing you to build downwards. It would also take a long time for it to refill however. See the wiki for details on how to build an efficient pump tower.

In case ur lazy :3
http://dwarf.lendemaindeveille.com/index.php/Screw_pump#Pumping_up_multiple_levels

[Drakis]

im working on a megaproject like that right now.    it seems to have hit a snag though....    i dug a circle around the pipe, hallowed it all out, colapsed floors to clear it, and then carefully drained the magma pipe into the larger circle, and chose a level to start building the base of my tower at.

now heres the snag, the pie stopped refilling at the bottom of my new clear glass floors...   i have a couple of 1s dancing around, but it wont fill up any further at all....     its getting annoying.   i might have to restart AGAIN... (this is the third time ive tried this megaproject

[Scruga]

Cam't you have the magma stream back into the inner circle?

[kg333]

If I remember right, the tricky part with this whole plan is that magma pipes fill back up at the top.  When you try to drain it, you'll get what looks like momentary spikes of magma on the surface, which is the newly generated magma falling to the level you've drained.  It'll make things dicey if you're trying to build in there.

KG

[zchris13]

That has been disproven.  Magma pipes spawn 3 high blocks of 7/7 magma above their surface.

[Lagren]

I think I've figured it out, but it's going to take water.

W= Wall
M= Magma
G= Wall Grate or vertical bars (over Magma)
O= Open Space created by pumps
P= Pump, with direction of pumping
F= Floor

Code: [Select]

WWWMMMMMMMMMMWW
WFFPPPPPPPPPFFW
WFF^^^^^^^^^FFW
MP<GGGGGGGGG>PM
MP<GOOOOOOOG>PM
MP<GOOOOOOOG>PM
MP<GOOOOOOOG>PM
MP<GOOOOOOOG>PM
MP<GOOOOOOOG>PM
MP<GOOOOOOOG>PM
MP<GOOOOOOOG>PM
MP<GGGGGGGGG>PM
WFFvvvvvvvvvFFW
WFFPPPPPPPPPFFW
WWWMMMMMMMMMWWW
Then, on the floor above (northwest corner matches with northwesternmost wall grate):
X= Floodgates
B= Bridges

Code: [Select]

To Water
  W^^^W
  W|||W
WWWXXXWWW
WBBBBBBBW
WBBBBBBBW
WBBBBBBBW
WBBBBBBBW
WBBBBBBBW
WBBBBBBBW
WBBBBBBBW
WWWWWWWWW

Let the upper room fill with water, close the floodgates, then retract the bridges, and you'll get this, cast from obsidian. If the vertical bars won't hold it up, then you could perhaps use a wall somewhere, but it won't allow pumping by the pumps next to it.

Code: [Select]

WWWWWWWWW
WFFFFFFFW
WFFFFFFFW
WFFFFFFFW
WFFFFFFFW
WFFFFFFFW
WFFFFFFFW
WFFFFFFFW
WWWWWWWWW


All you need to do for the next floor is channel out the floor in the room you've just made, and repeat. Afterward you can replace it.

Unfortunately, my fortress hasn't got a river. Would this work? Is it time for me to find a new fortress site?

[Shoku]

If you get a bottomless pit it would be easy to just have one level of pumps sending magma from pretty low in the pipe over to there (free flow would probably never empty the pipe.)

Sans pit there's another option though- if you've got magma safe materials you could build some drawbridges at the end of a tunnel you pumped magma into and have them atom smash several tiles out of existence.

You can either have some dwarf pulling a lever forever or you can build a repeater (though I don't know how you'd make one without a constant water source...)

[kg333]

That has been disproven.  Magma pipes spawn 3 high blocks of 7/7 magma above their surface.

Filling at the top?   So the pipe will spawn those blocks at whatever level you've drained the magma down to?

EDIT: Never mind, I found that it's been added to the wiki.  Here's the original thread: http://www.bay12games.com/forum/index.php?topic=26201.msg311730#msg311730

KG