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  1. #1
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    Feb 2010
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    The Best Hoses For Pulling Vacuum

    What does everyone use for hoses.

    I have seen a few posts that recommend stainless steel hoses. Where can you find them. It takes too long to get a good (250 microns) vacuum with standard hoses. Copper is good for pulling vacuum but kind of hard to work with.

    Also what is the best; ball valve ends or low loss fittings.

    Going to be getting a Testo 550 and want some good hoses.

  2. #2
    Join Date
    Sep 2008
    Location
    Western PA
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    25,692
    I have a couple of YJ heavy duty hoses that I have removed the depressors from and use as a straight hose for evacuation purposes.

    I rarely evacuate through my manifold anymore.

  3. #3
    Join Date
    Mar 2007
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    The best hoses for pulling a vacuum are the biggest ID you can get that don't leak.

    I also agree with jp though if you want fast don't pull your vacuum through a little 1/4" two way manifold.

    But .... you can speed up a two way manifold by using
    Bigger hoses 3/8 or 1/2 (depending on your vacuum pump connections) with 1/4" QC's on the other end.
    or make your 1/4" hoses as short as possible but 1/4" lines are not recommended for pulling vacuum.
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  4. #4
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    Feb 2010
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    Quote Originally Posted by itsiceman View Post
    The best hoses for pulling a vacuum are the biggest ID you can get that don't leak.

    I also agree with jp though if you want fast don't pull your vacuum through a little 1/4" two way manifold.

    But .... you can speed up a two way manifold by using
    Bigger hoses 3/8 or 1/2 (depending on your vacuum pump connections) with 1/4" QC's on the other end.
    or make your 1/4" hoses as short as possible but 1/4" lines are not recommended for pulling vacuum.
    So are you going from vacuum pump with 2 3/8 hoses right to the service valves with a micron gauge connected at the unit? Or just evacuating thru one 3/8 hose?

    I am asking because I have heard that air can permeate thru rubber hoses under a vacuum.

  5. #5
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    Mar 2007
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    I have a JB pump so I've been using two black Y/J 3/8"X1/4" hoses from the pump to a set of core removers or service valves.

    If I don't hook up the manifold I'll hook up the refer tank to the 1/4" port on the pump to break the vacuum through the 3/8" lines with the ball valve shut off on the pump.
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  6. #6
    Join Date
    Sep 2005
    Location
    central jersey
    Posts
    289
    How long does it take to get to 500 microns using your set up

  7. #7
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    Mar 2007
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    Huh
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  8. #8
    Join Date
    Sep 2005
    Location
    central jersey
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    289
    huh? how long 10 minutes 20 minutes etc

  9. #9
    Join Date
    Sep 2005
    Location
    Atlanta GA area
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    21,189
    My experience is that the ends of the hoses are as important as the hoses are... Sometimes the O rings in the ends get weak and will leak around 1000 microns... then it takes a LONG time to get down.

    I do well with regular YJ hoses, however I am careful with the ends.
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  10. #10
    Join Date
    Feb 2005
    Posts
    665
    Well here is the set I have!



    http://www.appioninc.com/products/mgakitfeatures.html

    The manifold is huge and funny looking, but with the diaphragm-operated valves and bearing-actuated knobs provide down to 20 microns, and does it quickly!

    I'm so done with cheap undersized YJ hoses and leaky gauges/manifolds.

  11. #11
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    Mar 2007
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    Quote Originally Posted by dodge View Post
    huh? how long 10 minutes 20 minutes etc
    yes
    You can't put a specific time on pulling a vacuum on a system like that as they would all be different.
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  12. #12
    Join Date
    Jan 2007
    Location
    Joplin, MO
    Posts
    10
    I use yj heavy duty 3/8 hose to suction side valve and the micron gauge on the liquid side. Both sides get a core removal tool. Alot faster that way than through gauge set. No problems getting below 100 microns.

  13. #13
    Join Date
    Apr 2004
    Location
    Midwest
    Posts
    2,683
    Quote Originally Posted by chuckcrj View Post
    What does everyone use for hoses.

    I have seen a few posts that recommend stainless steel hoses. Where can you find them. It takes too long to get a good (250 microns) vacuum with standard hoses. Copper is good for pulling vacuum but kind of hard to work with.

    Also what is the best; ball valve ends or low loss fittings.

    Going to be getting a Testo 550 and want some good hoses.
    I have a demo Testo 550, you will love them. However, as with most manifold sets not real practical for evacuation unless you want to spend all day.

    I don’t use any manifold for evacuation, I only recommend Appion evacuation hoses and core removers. Evacuation time is all about flow, get yourself a 1/2 hose and ditch the manifold for evacuation. Most hoses will not hold under 500 Microns, Appion hoses are vacuum certified down to 20 Microns.

    I have ran tons of tests over the last several years. I recently ran a test on 2 two ton splits with 20 foot linesets. Conventional method with manifold 54 minutes to 500 Microns. Appion core remover and 1/2 hose to 500 Microns (no gauge manifold) 7 minutes.

    Good luck
    Live each day like it is your last, for one day you will be right!

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