Jim McCulloch
Last Activity:
Sep 24, 2020 at 3:59 PM
Joined:
Aug 6, 2017
Messages:
258
Likes Received:
30
Trophy Points:
28
Gender:
Male
Birthday:
Sep 8, 1961 (Age: 59)
Location:
Houston TEXAS
Occupation:
Dirtbag

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Jim McCulloch United States

New Member, Male, 59, from Houston TEXAS

Jim McCulloch was last seen:
Sep 24, 2020 at 3:59 PM
    1. Paul Myers
      Paul Myers
      We have most of the part required to build this fan up again but lots of conseqential damage.
      need to identify the chicken and the egg. I'll get a look at the radial bearing today. I can't see it failing and allowing blade tip contact. I think it would overheat and seize before having enough radial play to fail blades.
      1. View previous comments...
      2. Paul Myers
        Paul Myers
        We are going to install some instrumentation on another unit and run through start scenarios. We want to see if the fans run in the stall zone at any point. thinking failures might be accumulated fatigue damage from that. Theoretically they should not see it. Want to see how second fan starting interacts.
        Aug 6, 2020
      3. Jim McCulloch
        Jim McCulloch
        Doesn't stall happen at low speeds? I was wondering if the RPM remains the same but the blade angle changes to vary the flow. Also, I assume you have vibration transmitters on there? Just asking, I am no expert.
        Aug 6, 2020
      4. Paul Myers
        Paul Myers
        Yes constant Rpm. Blade pitch changes for fan pressure / flow. Stall can happen at any speed if angle of attack of the blade exceeds the ability for the air to stay attached to the upstream surface of the blade. But the area it is a risk for these fans is at the lower flow. Vibration transmitters not sensitive enough to show stall. We do have stall probes.
        Aug 7, 2020
    2. Paul Myers
      Paul Myers
      So we had a 3500 HP boiler axial flow, variable pitch, Forced Draft Fan self destruct a couple of weeks ago.
      It happened once in the past. thought we had the appropriate checks in place but in hindsight it was not so.

      I know its not motorcycles but thought you would be interested. Had alot more detail but found 420 character limit?
      1. Jim McCulloch
        Jim McCulloch
        Holy Crap, you can't go to Walmart to find that either. It kind of sucks that Howden NA has bought up so many fan companies and they are so understaffed. I feel your pain.
        Aug 5, 2020
      2. Jim McCulloch
        Jim McCulloch
        I used to work for Howden as a Rep. I got beat daily by power plants trying to get parts. It took us weeks to reply sometimes.
        Aug 5, 2020
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  • About

    Gender:
    Male
    Birthday:
    Sep 8, 1961 (Age: 59)
    Location:
    Houston TEXAS
    Occupation:
    Dirtbag
    Type of Bike(s):
    1986 VF500F
    Gender:
    Male
    Home Country:
    United States
    Name:
    Jim
    Subscribe:
    Yes