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.

Jobs

VALVE POSITION FOR STANDARD PSV

VALVE POSITION FOR STANDARD PSV

(OP)
Hello house,
Please, i want to know the position of valves on standby PSV.
I know that the downstream manual valve should always be locked open, and if it is a single valve upstream, it should be locked close. But in a situation of double-block upstream what should be the position of each valve upstream the PSV.

RE: VALVE POSITION FOR STANDARD PSV

It is like any DB&B arrangement - normally both valves are kept in closed position.

Dejan IVANOVIC
Process Engineer, MSChE

RE: VALVE POSITION FOR STANDARD PSV

NO! NO! NO! You are misreading the attached sketch. Any Block Valves upstream or down stream of a PSV should be Car Sealed Open (CSO) or locked OPEN not Closed.
If the block valves are car sealed Closed then there is no reason to have a PSV. A Blocked in PSV is rendered non-functional.

Sometimes its possible to do all the right things and still get bad results

RE: VALVE POSITION FOR STANDARD PSV

The OP was referring to a standby PSV (isolated).

Dejan IVANOVIC
Process Engineer, MSChE

RE: VALVE POSITION FOR STANDARD PSV

However, in the case where you have parallel PSVs then you can have one set of block valves CSO (Open) and one set of Block valves CSC (Closed).

Sometimes its possible to do all the right things and still get bad results

RE: VALVE POSITION FOR STANDARD PSV

This was the question. You probably scared the OP flip

Dejan IVANOVIC
Process Engineer, MSChE

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


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