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[EvilTwin]

Ok, so I've built this orc frying device i developped (orcs from dig deeper, if anyone is wondering). It includes some pumping of magma, and since I've read that non magma-safe pumps will work for magma as long as the magma isn't entering the pumping tile, I thought it would work... The pump in question here is pumping the magma into a resevoir, but since I realized that if the destination square is blocked by fluid, the ppump isn't pumping, i hadn't designed an off switch for it.
Then the strangeness: The reservoir filled up, the pump pumped on. For a LONG time, nothing would happen, until I suddenly read the announcement "The Stray Donkey Foal has died in the heat.". I wasn't expecting this, and when I looked for leaking magma, I saw that the pump was deconstructed and magma was roaming freely around from the (originally closed) reservoir.
Luckily the reservoir wasn't too big, and I got the situation cleared up, but this seems like pretty buggish behaviour to me, knowing that the game assumes pumps as being magma-safe when they aren't threatened directly by the magma, but just pumping it.
I'm also pretty sure that no magma could ente the pumping tile, since I double-checked it now...

[Sphalerite]

Back pressure won't destroy pumps.  I have several mechanisms in a current fortress where magma pumps with blocked exits have run nonstop for years without being damaged.

Did you use any wood in the pump?  Pumps containing wood will suffer damage and eventually deconstruct if used to pump magma even if the magma isn't on the same tile as the pump.

[EvilTwin]

hmm, that might be... is it on the wiki? cause i haven't read it...

EDIT: yep, all there... sorry.

[garfield751]

wooden pumps usually can fill a 10 x 10 obsidion mold twice before being too damaged. i know this from personal expirence. im fairly sure pump components made from anything except wood wont fail unless magma is on the pump tile.

[Retro]

im fairly sure pump components made from anything except wood wont fail unless magma is on the pump tile.

Confirming this. As a side note, if you're looking for a non-metal pump that can withstand magma being directly on it, making glass pumps is a good option.

[gtmattz]

I have used pumps containing wood to pump magma in a pinch, as long as you dont pump long and plan for removal without releasing a wall of magma, you can periodically deconstruct and rebuild the pumps to 'reset' the wear (I think... at least this has worked for me with no unforseen Fun).  I did use stone block, so I am not sure if maybe that is why my pumps did not deconstruct?

[garfield751]

I did use stone block, so I am not sure if maybe that is why my pumps did not deconstruct?

i used a bauxite block with wood components and it failed after a being used for awhile.

[gtmattz]

I did use stone block, so I am not sure if maybe that is why my pumps did not deconstruct?

i used a bauxite block with wood components and it failed after a being used for awhile.

Thanks for the heads up.  Now I suppose I am going to have to do some SCIENCE and figure out just how long a wooden component pump can pump magma before kersploding.