×
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!

*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

Frequent trip of slum shut off valve.

Frequent trip of slum shut off valve.

Frequent trip of slum shut off valve.

(OP)
On our pressure regulating skid (4"), one of the two slum shut valves on the line trips frequently with a low-pressure indication on the SCADA. Due to the frequent trips, we have engaged both lines to run simultaneously to avoid tripping the turbines in the event of the SSV shut. Both SSV has different pressure set points 33.1barg and 32.5barg respectively with regulator set pressure of 28.9barg.

I have two questions:

1. What must be the cause the frequent shut of the SSV.
2. Is it practically advisable to run both lines simultaneously
3. Is it practically prudent to give the SSV's different set values.

RE: Frequent trip of slum shut off valve.

P &ID with set points please.

Have you calibrated all the pressure transmitters?

Why does the valve close on low pressure?

To have even an educated guess you need to give us the full picture.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Frequent trip of slum shut off valve.

Why is your slam shut set to trip on low pressure? That's not usually the case

RE: Frequent trip of slum shut off valve.



1. What must be the cause the frequent shut of the SSV.
NO idea - You've provided no information to even hazard a guess other than something in the logic is triggering the valve closure. Are these actuated electronically or pneumatics?

2. Is it practically advisable to run both lines simultaneously
Yes, but normally you need to set the regulators different, one lower than the other by may 1 to 1.5 bar. The lower regulator will normally be close, but if the other stream closes it takes over pretty seamlessly, so long as the pressure regulating valve can open fast enough.

3. Is it practically prudent to give the SSV's different set values.
Again yes, but the difference seems very low. /normally needs min 1.5 barg at this sort of pressure (5%)

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

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



News


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