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Thread: Wort and Beer Pumping Velocities

  1. #1
    Join Date
    Dec 2003
    Location
    London, United Kingdom
    Posts
    181

    Wort and Beer Pumping Velocities

    Hi All,

    Does anyone know the recommended wort and beer maximum pumping velocities to minimise shearing/product damage. I am frustrated because I did some reading a few weeks ago and can't remember where I read it.

    Cheers,

    Alex

  2. #2
    Join Date
    Dec 2003
    Location
    London, United Kingdom
    Posts
    181
    hi everyone,

    just in case anyone is interested, i found the answer i was looking for. according to Kunze the recommended flow velocity for beer and wort is < 3.0m/s, with velocities excess of this OK for short distances.

    cheers,

    alex

  3. #3
    Join Date
    Oct 2002
    Location
    Tadcaster, Yorkshire, UK
    Posts
    1,106
    I am surprised he gives flow rates that high. Effective turbulent flow for cleaning starts at about 1.8 meters/sec, though some people reckon 1.5 is sufficient. Anything above 2.2 will be wasting energy for no real benefit, but with a large increase in back pressure over longer runs. You need sufficient flow for clean beer / water interfaces, which means turbulent flow - but not much above - i.e. somewhere between 1.5 and 1.8 m/s should do it. This fits in with my memory when I started out andd we were still using imperial measurement of speeds being quoted as 5 ft / sec for beer flow, 7 ft / sec for cleaning.

    I guess if you take the question / answer as what point does damage occur, then his answer is undoubtedly correct, but......

    Cheers
    dick

  4. #4
    Join Date
    Nov 2003
    Posts
    99
    Hi Alex,

    Here are some miscellaneous max. velocity numbers as recommended by Siebel:

    1.5m/s for CO2-contaning fluid (to avoid shear)
    3m/s for water
    20m/s for CO2 gas
    20m/s for compressed air
    25m/s for steam
    1.5m/s for glycol cooling medium
    1.5m/s for milk
    2m/s for non-sparkling beverages

    There are a couple of extras in here for interest, but the recommendation for milk is interesting and is consistent with my previous experience...

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