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[Gatleos]

Ahem. So, I've been wondering for a while: do pump stacks pumping magma really need magma-safe materials? Non-magma-safe materials slowly degrade when submerged in lava, but with a pump stack I don't think that matters much, since the magma doesn't ever really "touch" the pump itself, just moves from one side to the other. Has anybody managed to build a magma pump partly from non-magma-safe materials?

[87]

in 40d the entire pump had to be made of safe material or it would deconstruct and leave magma thrown everywhere.

[Mini]

No it didn't. I had magma pumps made entirely out of wood that worked fine most of the time. Sometimes they would start burning.

Magma pumps still don't need to be magma safe. Making them out of fire safe (that is, not wood) materials would still be a good idea.

[forsaken1111]

Pumps WILL deconstruct if magma ever flows back over the 'walkable' square of the pump and it isn't all magma safe.

[Ralith]

If the magma is kept from the walkable square, then it does not matter what you use except for wood, which will occasionally catch on fire due to ambient temperature. Makes me wonder how the dorfs stand it, but who cares..

[Sphalerite]

Note that pumps made entirely from glass are magma-safe.  Not only will they pump magma safely, but if you accidentally immerse the entire pump in magma it won't be damaged.  Glass doesn't have its properties defined in the raws and is a bit screwy when it comes to magma-safe-status.

[KrazyDocK]

The rock block needs to be made of a magma-safe material.  I just successfully completed a pump stack after 2 failures and savescumming.  The only difference with the successful one was that I made sure the rock blocks were magma safe (in my case, mostly kaolinite and a few quartzite and gabbro...but there are several others according to the wiki).

Without a magma safe rock block, it deconstructs after a few moments of operation.

[Quietust]

Note that pumps made entirely from glass are magma-safe.  Not only will they pump magma safely, but if you accidentally immerse the entire pump in magma it won't be damaged.  Glass doesn't have its properties defined in the raws and is a bit screwy when it comes to magma-safe-status.

Earlier this week, I did a bit of digging through the game's code (using cheat engine as a debugger) and managed to discover that, in both 23a and 40d, all 3 types of glass have a melting point of 13600 (same as bauxite) and a boiling point of 16000 (and a specific heat capacity of 700), which would make them 100% magma-safe. I have a general idea as to where version 0.31 initializes the properties of the 3 glass types but I haven't pinpointed where it sets the melting points, though in all probability they're exactly the same as before.

There seems to be a bit of oddity with regards to how items behave when dumped into magma when outdoors (namely, they vanish into thin air, just like pieces of clothing do), but if they're in a building, they should be good.

[TheyTarget]

With temperature off. I pumped magma 100 z levels with wood. Nothing FUN ever happened. It all worked.

[Kanddak]

With temperature off. I pumped magma 100 z levels with wood. Nothing FUN ever happened. It all worked.

When temperature is turned off, magma doesn't have temperature. 

[TheyTarget]

With temperature off. I pumped magma 100 z levels with wood. Nothing FUN ever happened. It all worked.

When temperature is turned off, magma doesn't have temperature. 

Yeah its more like red water, with the ability to give you easy smelting.

[Shurhaian]

Except more viscous. Red jelly.

[mLegion]

submerged nether-cap pumps don't deconstruct or catch fire.

[Silophant]

Nether-caps are supernaturally cold, and stay at freezing temperatures. So they're special, and magma-safe.

[mLegion]

yup their fixed freezing temperature means they're excellent for axles near or even submerged in magma without worries about deconstruction.