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[Slythe]

I've read the wiki and it tries to explain how this works, but frankly it's a bit inadequate and it seems like something you'd need to test yourself at different distances and circumstances.

My fortress is dug down at the center of the map.  There is a magma pipe at one of the extreme corners of the map.  I'd like to be able to route the magma from the pipe along a long tunnel to a series of tunnels below my future magma furnaces.  Will the magma be able to flow that far without evaporating if it's coming out from the lower levels of a magma pipe?  If not, then do I need to either use pumps (which I've never done), or let it flow a small distance up to a gate, fill up, then let that go to fill another section, etc.? 

[Kanddak]

As long as it's a 1-tile-wide pipe, the magma will eventually get there on its own, but it will be slow. You should use a pump.