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    steel compression tanks collapsing? (6 Posts)

  • steamfitter steamfitter @ 12:31 PM
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    steel compression tanks collapsing?

    Curious!
    I read about this happening, but I'm curious if anyone has a real life story about a steel compression tank collapsing and possibly any pictures.
    Thanks!
  • Mark Eatherton Mark Eatherton @ 10:28 AM
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    Not in 35 years...

    If one were to allow STEAM to get into the tank (increase in volume by 1500 times), and the steam was allowed to collapse, it COULD cause a tank to flatten out or collapse, but it would take a WHOLE lot of conditions (check valve where it shouldn't be) in order to get it to go.

    I saw a demonstration at a community college in Canada where they take a 55 gallon drum and fill it with steam (atmospheric pressure), and then close it off and let the steam collapse (decrease in volume by 1500 times) and watch it crumple like an aluminum beer can.

    But in all of my tours, I've never seen ANY expansion/compression tanks (bladder, non bladder, diaphragmatic etc) collapse.

    Another internet myth? ;-)

    ME
    It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
    This post was edited by an admin on July 23, 2013 10:30 AM.
  • hot rod hot rod @ 1:37 PM
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    Actually

    I think Mark put a bear hug on the drum to impress the young Wilo engineer in the pic.
  • bill bill @ 1:51 PM
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    That would be trip..

    you know, to watch a 55 gallon drum implode.
    BTW in Dan's Pumping Away book, on page 21, he mentions, and has a diagram of a tank collapsing. Hmm
  • Mark Eatherton Mark Eatherton @ 9:55 PM
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    That was it...

    N.A.I.T. Coolest trade school you will ever see. Thanks for the memory Bob.

    ME
    It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
  • Dan Holohan Dan Holohan @ 5:01 PM
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    I was on a job in a Long Island apartment building.

    We're standing in the boiler room and the contractor is draining the whole system in this building that was about seven stories tall. He's doing it as quickly as he can.

    Unfortunately, he forgot to open a vent line to the five steel expansion tanks that hung from the ceiling. As the water fell out of the building, it also dropped inside the the tanks, causing the air inside the tank to expand. We realized all of this afterward.

    It doesn't take much atmospheric pressure to crush a tank from the outside. Circles are meant to take pressure from the inside, not the outside. I will never forget the sound those five tanks made as they simultaneously collapsed and I'm laughing now as I recall how quickly it all happened.

    I carried one of those tanks with me to my seminars for a couple of years. Then I got too old to be carrying around big tanks. ;-)
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