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  1. aeroUB

    Proper Method for Balancing a 2 Stage Fan Rotor

    Hi I would like to get some input from some experienced vibration/balancing people. There has been some debate (between me and some others), about the proper way to balance a 2 stage axial fan rotor. I believe that it should be treated like a 2 plane imbalance and can use a vibration...
  2. aeroUB

    Does anyone travel A LOT for work?

    Sorry, I mean several posts within this thread. Maybe I missed a fight or something lol.
  3. aeroUB

    Does anyone travel A LOT for work?

    Is it just me or did several threads get deleted!?!
  4. aeroUB

    Does anyone travel A LOT for work?

    This is a lot of good and interesting info guys...thanks. One thing I would like to know more about is how to best take advantage of any and all incentives/bonuses I could rack up from all this traveling. I really don't know much about how it all works. I could probably stay in a Holiday Inn...
  5. aeroUB

    Does anyone travel A LOT for work?

    The laptop suggestion is something I didn't think about. I'll look into that, I didn't know they get funny about what you do with or put on the laptop...I'll probably just get my own then. They actually do also provide a cell phone although I am in the middle of a two year contract on my own...
  6. aeroUB

    Does anyone travel A LOT for work?

    Well, I may be getting a new job. It's for a field service engineer and would be so much more money than I'm getting now that it's making my head spin. The catch is, it would be 100% travel. If there isn't somewhere to go then I can do what I want and still get paid 40hrs a week. 90% of the...
  7. aeroUB

    How to Approx. balanced Total pressures and CFM?

    One thing I noticed, On the fan curve of Flow vs Pressure. The fan curve eventualy hits the curve for Velocity Pressure. If I assumed that there is no static pressure in the unit, or if this fan was used in open space at a contant RPM, is this the point at where the flow would maximized? And...
  8. aeroUB

    How to Approx. balanced Total pressures and CFM?

    Berk, Yes, I mean a failure where to dampers are wide open. I guess there would be some resistance due to the fact that there is a 20' 9-blade fan in the way that the entering air would want to 'pin-wheel' in the opposite direction but I wouldn't expect this to add significantly to the static...
  9. aeroUB

    How to Approx. balanced Total pressures and CFM?

    Are you afraid that I was not aware of that? 1. It was posed after another question was already answered and could be easily missed. 2. I figured this question would be better directed towards someone who is more specialized in aerodynamics. But thanks for the input.
  10. aeroUB

    How to Approx. balanced Total pressures and CFM?

    Here is and Example. There is a system with 2-20ft dia. fans, in parallel, pulling air through a bunch of cooling coils with a cross-sectional area of about 800 ft^2. One fan is running and the other is isolated by backdraft dampers. In this situation the flow through the unit is 842,770...
  11. aeroUB

    How air velocity effects heat transfer of evaporative cooler?

    yorkman, That makes sense and the entering DB, WB and exiting DB, WB is info that I would have or could calc. if I knew what happened to the air. I guess my real issue in this problem is determining what happens to the airflow. Which, I believe I have figured out through another post that was...
  12. aeroUB

    What happens to CFM with one fan out in a 2-fan system?

    Great info guys. Ko, that is exactly what I was looking for and after messing around with it for a while I think I got it. With the fans i'm using for this example I'm coming up with approx. 71% of the airflow with one fan compaired to the two fans. Also a TOTAL pressure (static + velocity)...
  13. aeroUB

    What happens to CFM with one fan out in a 2-fan system?

    If you have a two-fan system that are pulling air at a known CFM, what happens when one is shutdown and blocked off so that air is not allowed to enter through the stopped fan? There are two identical fans drawings air through a unit with an internal (before the fans) static pressure of 0.832"...
  14. aeroUB

    How air velocity effects heat transfer of evaporative cooler?

    Example There is a closed loop evaporative cooler. The cooler consist of coils/tube bundles made of 1" OD x 0.065 wall tubing that are bent into serpentines to form 6-passes per tube/circuit and 42 tubes/serps wide. There are several coils/tube bundles set side by side and two large fans with...
  15. aeroUB

    Loading Stresses in a Weld Tee

    I'm making a pressure vessel header out of a sch. 80 8" pipe and for the nozzle coming out of the pipe I would like to use a butt welded 8" Tee. There are required loads that the "nozzle" needs to be able to support. But I'm not sure how I can demonstrate if it can support them or not. There...
  16. aeroUB

    Process for cutting welded pipe/cross headers in half?

    I wont be looking to do this our selves, but will have some place do the cutting for us after we weld the headers up. I just want to know what processes would be the best most cost effective to use. The surface that is left by the process wont really be of concern as long as the kerf is small...
  17. aeroUB

    Process for cutting welded pipe/cross headers in half?

    I am making headers for a ‘pressure vessel’ out of pipe and crosses. It will be 4” sch. 40 steel pipe with two (2) 4” butt weld crosses. I would like to have these cut in half after being welded up and be able to use BOTH halfs. It will need to have a small kerf as I can’t have much material...
  18. aeroUB

    Process for cutting welded pipe/cross headers in half?

    I am making headers for a ‘pressure vessel’ out of pipe and crosses. It will be 4” sch. 40 steel pipe with two (2) 4” butt weld crosses. I would like to have these cut in half after being welded up and be able to use BOTH halfs. It will need to have a small kerf as I can’t have much material...
  19. aeroUB

    How to get AutoCAD to save print settings?

    Thx for the info guys!
  20. aeroUB

    How to get AutoCAD to save print settings?

    Just something that has been bugging me for a little while. On my old setup, once you printed the first time and then saved a drawing again, it would keep the same settings the next time that you wanted to print. Now with my new setup, everytime I goto print I have to re-select all the...

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