Effects of Atmospheric Pressure on Vacuum Level

Discussion in 'Fiberglass and Composite Boat Building' started by Tungsten, Jul 17, 2012.

  1. Tungsten
    Joined: Nov 2011
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    Tungsten Senior Member

    I'm at 3200' or 950M ish above sea level.Charts suggest a perfict vacuum would be around 26.6Hg.My pump will pull too 25.5Hg i think i'm good enough for infusion.
    Am i right in saying its no different then pulling 28.8 at sea level?
     
  2. CDK
    Joined: Aug 2007
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    CDK retired engineer

    25.5 Hg is the point at which your pump cannot expel more than the air leakage, so a state of equilibrium is reached. That is regardless of altitude, at 3200' that point is reached a little bit earlier.
     
  3. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    The pump is rated for pressure differential. As long as atmospheric pressure is over 25.5Hg you will get the same vacuum.
     
  4. Tungsten
    Joined: Nov 2011
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    Tungsten Senior Member

    Sorry i don't fully understand your answers.I guess i just want to know if i'll be ok to try an infusion test?
     
  5. tunnels

    tunnels Previous Member

    just do it !! theres only two answers yes it works or no it dosent !!
    Its only sucking out the air even if you were in outer space its just sucking air out of a bag !!:D
     

  6. Herman
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    Herman Senior Member

    This pump should be ok.
     
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