×
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

Seal flush plan

Seal flush plan

Seal flush plan

(OP)
For the coker unit feed pump, as per licensor document the seal flush plan is 11,52. The service fluid temperature is 200 deg C ( normal) and (max) 260 deg C. One seal vendor offer the same seal flush plan as indicated where as the other seal vendor offers 23,52. It is obvious that since the temperature is high the second vendor is offering for 23 seal flush plan. What could be different in design between these seal vendors How come the pioneers of the seal manufacturers differ in their recommendation? I would also like to know what would be probable reasons to go in for  11 seal flush plan eventhough the temperature is high as indicated above. Thanks to clarify  

RE: Seal flush plan

One probable reason Plan 11 is specified is that the product will not Vapourize and therefore plan 23 not required.  The Vendor with Plan 11 may have offered offered a Metal Bellows seal and the Vendor with Plan 23 offered a pusher seal (with Orings). Can you confirm?  

Plan 11 is normally cheaper than plan 23 as it does not require a Heat Exchanger.  To determine whether you need plan 23 have a look at the Vapour margin.  Is the VP close to the chamber pressure? If your product will not vapourize then Plan 23 not required.

If VP is low then it looks like Plan 11+52 is sufficient with a Tandem Metal Bellows Seals.  If you accept Pusher seals then you should use Perfluoroelastomers.

RE: Seal flush plan

Just curious, what is the stuffing box pressure?. I had really bad experiences with 11/52 plan applications on this service (Tandem Metal Bellows Seal).

Have you considered Plan 32 or 54?, I know it's way more expensive but at the end pay off.

 

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