×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Mechanical Seals

Mechanical Seals

Mechanical Seals

(OP)
What is the advantages of using a seal type "B" vs a "C" type. In seal "C" the bellows is not rotating.

RE: Mechanical Seals

A rotating bellow is often considered to be "self-cleaning."  If the sealed fluid is on the outside, it will tend to throw out solids rather than plugging up.  But, it may be susceptible to erosion.  A stationary bellows can handle more angular misalignment since the bellows does not flex with each rotation.  But, it may plug up if solids are present.  It was common belief in the past that a stationary bellows is more likely to hang up and leak severely.  A rotating bellows may be more likely to leak gradually rather than suddenly.  

So, for a dirty fluid that poses a high danger of fire, we would prefer a rotating bellows.  For a less volatile fluid in a pump that may have high stuffing box face run-out, we would prefer a stationary bellows.  

But, every service must be looked at individually.  
 

Johnny Pellin

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!


Resources