×
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

Shut Down time Shut down Valve in hydrocarbon export line.

Shut Down time Shut down Valve in hydrocarbon export line.

Shut Down time Shut down Valve in hydrocarbon export line.

(OP)
Hi experts,

Can any body suggest regarding time within which a shutdown valve of hydrocarbon export line should close.

Thanks

RE: Shut Down time Shut down Valve in hydrocarbon export line.

The last time I checked, offshore regulations permitted up to 45 seconds to close a shutdown valve.  A throwdown number for valve closure is one second per inch body size.  Some valves over NPS 24 may require quick exhaust valves to meet beat the 45 second requirement.  My throwdown basis is spring-opposed ball valves.  The number is reasonable for butterfly valves although they should close more quickly.  If a faster closure is required you can work with the engineers to select larger actuators and tricked out pneumatic accessories.

RE: Shut Down time Shut down Valve in hydrocarbon export line.

I typcially use less than 1 minute.

If you put a speed controller on your air line, you can field adjust the speed of closing.

"Do not worry about your problems with mathematics, I assure you mine are far greater."   
Albert Einstein
Have you read FAQ731-376: Eng-Tips.com Forum Policies to make the best use of Eng-Tips Forums?

RE: Shut Down time Shut down Valve in hydrocarbon export line.

You might actually evaluate a need for faster closure than the maximum time allowed based on rupture flowrate, product loss, resultant contamination and health & safety risk.  Are you in a high value facility, a sensitive habitat and can you minimize risk to personnal and equipment with a faster closure?

http://virtualpipeline.spaces.msn.com

RE: Shut Down time Shut down Valve in hydrocarbon export line.

Just check for hammer.  On fail close valve, I buy several different sinter bronze or aluminum vent filters.  Each one has its own Cv and find the one that works for the valve.

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