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

Dear all. Hello! I have a question

Dear all. Hello! I have a question

Dear all. Hello! I have a question

Dear all. Hello!
I have a question. would you please help me?
In our attached P&ID, reflux valve (FV-111) transfer reflux liquid coming from reflux compressor to demethanizer. Here is the problem: The reflux flow through FV-111 decreases with time, although opening of FV-111 is constant. How can that happened? Also, the bypass glove valve is producing lots of noise. Why?!
Thanks in advance.

RE: Dear all. Hello! I have a question

Not to guess why the flow through FV-111 was decreased. But, the noise from the bypass globe valve of the FV-111 could be due to the flow leaking through it.
What's the record of the maintenance and inspection history about it?

RE: Dear all. Hello! I have a question

If there's noise from the bypass valve, then there's flow passing through the valve.

RE: Dear all. Hello! I have a question

FIC setpoint is obviously too high. There is insufficient reflux being produced in the MCHE. There can be many reasons for insufficient cooling if the FIC SP is correct.
Maybe the reflux compressor capacity has dropped?

RE: Dear all. Hello! I have a question

And kindly put something in the subject line the next time you post, please and thank you.


"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

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


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