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  1. #14
    Join Date
    Dec 2014
    Location
    In my truck, driving
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    Quote Originally Posted by mspanky View Post
    I ran into this issue last night with a co-worker. We were having issues pulling a vacuum and transferring liquid on a supermarket rack and finally narrowed it down to a restriction in a 5ft charging hose. When we cut the hose in half, and then length wise, the entire length of the inner hose liner was collapsed on itself and blocking flow. This hose is 5 or 6 years old and has been used maybe 10 times total, including the night before, without any problems.

    Any theories on what happened?

    Attachment 471911
    This same thing must have happened to 72" set with BVs that I returned. I prefer the old style hoses.
    Seems they are obsolete now.

  2. #15
    Join Date
    May 2010
    Location
    Canada
    Posts
    1,281
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    Quote Originally Posted by TURBOCHILL View Post
    I use S.S flared head hose for my vacuuming on large units . Usually 1/2" flared . And I am using medical vacuum pumps two stage rotary vane pumps such as Edwards28, Alcatel- Adixen 2021I[/I] or Varian DS602 range between 14-18 CFM , tested to 6 micron . I'll bring down my vacuum in some cases to 15-20 microns , and hold it on 250 -400 microns . Due to rubber hose out-gasing its really difficult to set your micron range correct . Now we have these VRF systems all over the town with hell of developed length of ref lines and our conventional vacuum pumps are not meant to do these tasks . As far as conventional vacuum pump I didnt see any better pump than J.B DV-285N 10 CFM .
    Where do you get the SS hoses?

  3. #16
    Join Date
    Aug 2009
    Location
    Maine
    Posts
    7,984
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    think YJ.
    Johnstone ordered a set for me.
    Quote Originally Posted by eddiegoodfellar View Post
    Where do you get the SS hoses?

  4. #17
    Join Date
    Jan 2016
    Location
    The triangle in the Keystone
    Posts
    915
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    This has happened to me twice before. Both were on 6-7 year old hoses that I abused.

  5. #18
    Join Date
    Jun 2012
    Location
    Northern NV
    Posts
    1,253
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    .....as if we don't have enough issues to deal with already! Hidden hose failure...

  6. #19
    Join Date
    Dec 2014
    Location
    In my truck, driving
    Posts
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    Quote Originally Posted by eddiegoodfellar View Post
    Where do you get the SS hoses?
    Salvage places, I had ordered new ones originally.
    http://hvac-talk.com/vbb/showthread....1#post25123991
    Jermichael Decorean Finley,
    I was squazzed... NPR interview.

  7. #20
    Join Date
    Aug 2009
    Location
    Maine
    Posts
    7,984
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    either JB or YJ sells them. Johnston had to orde them for me

    Quote Originally Posted by skwoodwiva2 View Post
    Salvage places, I had ordered new ones originally.
    http://hvac-talk.com/vbb/showthread....1#post25123991

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