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iso tank crash

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RomanKatz:
Hello friends,
we have encountered a strange event. At the plant there is an iso tank washing station. According to them, the tank was washed and cleaned, awaiting clearance when it suddenly collapsed within itself, like a vacuum from inside. How can this be?

See a pic

Borek:
If it was shut tight, it could implode, quite popular experiment.

What was it cleaned with? Was it hot during washing/cleaning? It doesn't have to be boiling water, perhaps it was washed with some low boiling, organic solvent?

https://www.youtube.com/watch?v=JsoE4F2Pb20

RomanKatz:
It was washed by a water jet, I am not sure how hot it was. A worker washes it from inside. They do it all the time so i don't think they have used some solvent.

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