I wondered what would cause a vacuum sufficient to do that.
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yep the steam out causes the air to rush out due to the heat expanding the air volume.
the cold rain hitting accelerates it dramatically, but can occur without the cold if the venting speed out exceeds the venting speed in. Lot's of youtube films of doing this to 44 gallon drums as a party trick. [ame=http://www.youtube.com/watch?v=7QV7rMqH_cY]Satsuma High School 5-6-2009 - YouTube[/ame]
I see this on big scale all the time as is a common mistake in the petro/chem business
Do we have a safety thread?