×
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

Mechanical seal Failure because of particles

Mechanical seal Failure because of particles

Mechanical seal Failure because of particles

(OP)
Hi

I need your help to identify the Couse of failure

seal is a single seal with seal face combination of carbon and silicon carbide with API plan 31.

operating condition
application : Hight pressure water ( particles presence)
temperature : Max 45 C
pressure 40 Bar

from the inspection there are deep groove in the seal faces that mean particles are not separated

question, do you have an idea what would be the Couse of failure??


RE: Mechanical seal Failure because of particles

You have not provided enough details. But, I am willing to take a guess:

    The cyclone separator is undersized
    The particles are lighter than water
    There is not enough differential pressure between the flush supply and the cyclone drain
    The orifices into our out of the cyclone are eroded and oversized
Based on our limited description of the service, I am picturing a high speed Sundyne in wash water service. The cyclone separator could be internal to the pump case. These are notorious for plugging up or eroding away. The orifice that feeds the separator may be the style that uses a little o-ring to seal the fitting to the inside of the diffuser. This o-ring could be missing or not sealing, allowing flow to bypass the orifice.

Provide a proper description of the pump and the service and we won't have to guess.

Johnny Pellin

RE: Mechanical seal Failure because of particles

Much more information is needed. We have seen instance of corrosion from the end user not understanding the metallurgy required in the RO with the fluid and the particulate together. This can cause severe degradation over short periods of time. How often are you having a shutdown with replacement and inspection?
Mr. D

RE: Mechanical seal Failure because of particles

aasb1988 - you already determined why the seal failed. Due to particulate causing damage on the seal face. You need to determine where that particulate is coming from, whether or not something was supposed to have removed it (most likely for this reason as well as others), or whether something is generating it which shouldn't. Sometimes unplanned corrosion happens from material incompatibility, or water chemistry issues, or mistakes in fabrication, or a mistake in filter size - but whatever the reason or failure we have no way to determine that with the information presented.


Quote (jjpellin)

The cyclone separator is undersized
The particles are lighter than water
There is not enough differential pressure between the flush supply and the cyclone drain
The orifices into our out of the cyclone are eroded and oversized

Add to that list my favorite - haven't cleaned the filter, so the cyclone is plugged and not separating (I supposed lack of ΔP might be the same thing).

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



News


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