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  1. #14
    Join Date
    Feb 2016
    Location
    Louisburg Kansas
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    BBeerme,
    Did that make her mad?
    Did you read my response to water flowing around the world? I thought that thread was interesting.

  2. #15
    Join Date
    May 2014
    Location
    Bay Area California
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    I was speaking in the generic sense. I've never been tasked with doing an official commissioning. But have been sent out many a time with a balance cone and told to fix the problems. Used to be when I saw a mess of wire flex, I'd try to explain to everyone that the job was not done proper, and they'll never get the airflow that they want or the system was designed for.

    Now I just say it is doing the best that it can do, because I've learned that no one wants to pay for reducting. There are exceptions of course, but this is just typical commercial office space.

    I did see your response to the garden hose question. I knew instinctively that friction loss could not increase to the point of no flow. Just didn't know the technical jargon.


    Quote Originally Posted by WAYNE3298 View Post
    BBeerme,
    Did that make her mad?
    Did you read my response to water flowing around the world? I thought that thread was interesting.

  3. #16
    Join Date
    Feb 2016
    Location
    Louisburg Kansas
    Posts
    514
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    You are correct friction loss will diminish flow a lot but cannot stop all water flow. Vertical head can stop all flow which to some sounds like a contradiction because friction loss develops friction head but friction head goes down as velocity is decreased.

  4. #17
    Join Date
    Mar 2017
    Posts
    2
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    I hope your boss understood the situation and is better than I was at getting the problems corrected.
    My retort to contractors like that just made them more pissed off.
    My Boss always has our back. She is actually one of the best bosses I've had.

  5. #18
    Join Date
    Aug 2013
    Location
    N/A
    Posts
    295
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    We did an install at a retail store, and the balancing co. came in, and TIGHTENED the belts so much, they BROKE a friggin' shaft on a 2 HP motor.
    BRAND NEW UNIT! Literally wasn't in place 72 hours.

  6. #19
    Join Date
    Feb 2016
    Location
    Louisburg Kansas
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    514
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    I have never seen belts tight enough to break a motor shaft. Do you know how he got them that tight?

  7. #20
    Join Date
    Sep 2007
    Location
    edmonds wa
    Posts
    3,916
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    I would think belts that tight, would pull the bearings out of the fan first. Seen that more than a time or 2.
    UA Local 32

  8. #21
    Join Date
    Feb 2004
    Location
    New Mexico
    Posts
    7,486
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    Quote Originally Posted by obieone View Post
    We did an install at a retail store, and the balancing co. came in, and TIGHTENED the belts so much, they BROKE a friggin' shaft on a 2 HP motor.
    BRAND NEW UNIT! Literally wasn't in place 72 hours.

    This is where "loss failure analysis" needs to be applied. Like how much shear load is necessary to break the shaft etc. What I can imagine is a loose sheave cutting through a shaft. Seems a belt would break before a shaft.
    I should have played the g'tar on the MTV. MK

    You can be anything you want......As long as you don't suck at it.

    SMW Lu49

  9. #22
    Join Date
    Feb 2016
    Location
    Louisburg Kansas
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    514
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    I'm betting on a factory defective shaft. I saw a contractor replace a belt that was worn and stretched. He didn't adjust the new belt because he was in a hurry. The new belt was so tight that when it dropped into the sheave it almost sounded like a shotgun blast. A month later no noticeable damage was done. Sooner or later bearing damage or some other damage had to happen.

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