×
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

inlet steam strainer deterioration

inlet steam strainer deterioration

inlet steam strainer deterioration

(OP)
Òur steam inlet strainer to a siemans HP (100 bar) Turbine has deteriorated on repeated occasions such that the strainer elements found their way to the turbine nozzle block and became trapped there. Can anyone explain why this is occuring? We have almost eliminated the strainer as being a design flaw as it is wotking good on two other similar plants. The only difference in the piping run, however, is that this plant has a 400mm to 200mm reducer immediately before the strainer while the other plants have a 300mm to 200mm reducer.

RE: inlet steam strainer deterioration

How far upstream of the strainer is the reducer?  Quantify immediately before, and is the strainer centered in the flowstream, or high or low, with respect to the centerline of the inlet reducer?

rmw

RE: inlet steam strainer deterioration

From what you have described, the problem is most likely to be due to excessive peak steam velocity caused by  excessive contraction at local reducer.
Options to consider are:

Add more distance between the reducer and strainer. This will even out the velocity profile and eliminate any vena contracta effect inside the strainer body. I think this is what rmw is hinting at

Replace the reducer with a longer one having a more gentle taper.

Add a target plate inside the strainer to eliminate direct impingement. There may be insufficient space to do this without adding considerable pressure loss; the strainer manufacturer may be able to help out.

Add flow straighteners between the reducer outlet and strainer inlet. It sounds as if you may be stuck for space though.

Cheers

Steve

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