×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.
5

Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

(OP)
1 fan blade(frp) in A336" diameter fan assembly has been found in catastrophic failure condition and drive shaft(metal) also found in bent and broken condition on ground.
What are the possible root causes??

RE: Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

4
Based on the extensive detail, I'm starting with Fire ants.

RE: Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

Yep
There isn’t even a picture of the ground it fell on, however how about the Op answer my problem.
I have a 10” diameter frying pan and the handle just fell off what might be the possible causes?

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

RE: Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

Oh dear...


Politicians like to panic, they need activity. It is their substitute for achievement.

RE: Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

3DDave is opting for fire ants, I'm suggesting termites.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

RE: Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

Failures like this often happen when stress exceeds strength.

RE: Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

Root cause: It broke.


Sorry. I couldn't help jumping on.

RE: Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

Good detective work, Dan. That's a little more to go on.

op - do you have a picture of the failed parts? That would be a good start.


=====================================
(2B)+(2B)' ?

RE: Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

These are the little bastards (Solenopsis invicta) that have a taste for fan blades ...




MJCronin
Sr. Process Engineer

RE: Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

Interesting. At first I thought the fire ants comment was a joke (referencing the lack of information). I knew fire ants could be a nasty hazard to my feet in the backyard, or maybe to electrical equipment, but I would never have guessed they might be a real hazard to machinery (although if it's the same fan that was causing the high vibration in the other post, that vibration did not appear to represent unbalance from fan degradation, based on the oddball frequency recorded).

=====================================
(2B)+(2B)' ?

RE: Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

The most typical effect for fire ants is they have a taste for electrical insulation and they like getting into the gaps of relays. So they end up being part of an electrical circuit and soon become part of a fire. They are low on the list, but given the previous difficulty in gaining information ...

I'm now legitimately wondering if there is a failing VFD that is feeding a really poor quality waveform into the motor and causing the vibration. I can see that leading to fatigue failure of the blade and the imbalance then bending the shaft.

RE: Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

Is this cell 3 that on or before Nov 18 had "Fan blades already have replaced with new blades.
Drive shaft also has been replaced with coupling and rebalancing has been performed also. But no effect on vibration."
.....................https://www.eng-tips.com/viewthread.cfm?qid=489403.....................

If so, the workmanship of the repairs AND the possibility of defective new parts must be tossed into the more-than-half-full bucket of possible "root causes".

Seriously, the broken parts and all mating parts and systems have critically important stories to tell.
They speak in pictures, not words (spoken or written).

RE: Fan blade (FRP)catastrophic failure and drive shaft bent and broke down in cooling tower.

3DDave,

You silly person. It had to have been space aliens!

--
JHG

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close