×
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

Clarification-Help on Reverse Screw Seal

Clarification-Help on Reverse Screw Seal

Clarification-Help on Reverse Screw Seal

(OP)
On re-reading my post, I thought some clarification was in order.  (Have also uploaded sketch):

Application:  Threads on a rotating shaft, comprising  "seal" or "excluder" in conjuction with the OD wall of stationary through sleeve or bore.  These are inboard of a mechanical seal.  Thread end and sleeve flush with inside of polycondensation PET reactor.  Process material on one end of reactor about 80-160 centipoise, other end about 2000-3000 poise,with near vacuum (2mm Hg)and 300 deg C in reactor.  Screw mainly to keep "drip" and pushed and tramp polymer, sliding down walls from above seal/shaft, and "rubbed around" from end of agitator, from ingressing along shaft (14"dia ) to front of mechanical seal housing.  Appears that threads on sleeve rather than shaft easiest to achive for particular application.  RPM is LOW...from 2 to 3 rpm.

Thanks!

RE: Clarification-Help on Reverse Screw Seal

Do you mean a "windback labbyrinth seal" or an excluder?

Your seal vendor should be able to design an excluder that is part of the mechanical seal.

RE: Clarification-Help on Reverse Screw Seal

Something like you are describing is relatively easy to incorporate into the seal design.

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