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[Jurph]

I had a 100 Z-level pump stack ready to feed magma up to the surface.  It was constructed from glass tubes, glass corkscrews, and gabbro blocks, which should all be magma-safe.  The first time I tried to operate it, one of the pumps in a sand layer had grown a tower cap (!) and by the time I chopped it down, almost 30 layers of pump stack had disassembled themselves.  I used the design from the Wiki. 

All I can figure is that I accidentally used a chalk block or wooden pipe section in one of the pumps... but why would 30+ layers disassemble themselves?

[Sphalerite]

In the standard pump stack design, each pump is supported by the pump below it.  If a pump is deconstructed or destroyed, every pump above it collapses.