×
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

Emergency Valve Selection

Emergency Valve Selection

Emergency Valve Selection

(OP)
am wanting to select a emergency shutoff valve in accident operation.
But I have no idea of the emergency valve. Could you tell me the ways to select the emergency valves and how to choose the type of emergency valve?
I normally see the emergency valve is ball valve. Why?
Thank you in advance.

RE: Emergency Valve Selection

Are you a Piper?
If not go talk to a Piper.
If you are a piper then go to "Google" and "ESDV" for some general information.

Then select a valve that meets the criteria for the applicable Line Class.
Then talk to a valve vendor.

RE: Emergency Valve Selection

You need to talk to operations people and understand what emergency scenario you are trying to minimize.  The emergency shut down scenarios should be evaluated for what action the valve should take.

Often emergency valves are ball valves because they are fast acting, high torque, least likely to stick or scale up, and have better shutoff (closer to 100%) than other valves.

RE: Emergency Valve Selection

Ball valves are 90 degree turn to close.  Gate valves can take more than 15 360 Degree turns to close.  The time to close becomes a factor for safety valves.  

Orbit valves are used too.  They are like ball valve but in a manual operation they take 10 or more 360 degree turns to close, however, they can be automated to close very quickly.

I usually do not get concerned about time to close on emergency valves.  The amount of flow over a several minute time span to close as compared to hundreds of thounsands of hydrocarbons already in the area where the emergency is not significant.

RE: Emergency Valve Selection

Sometimes ESVs are needed to isolate control rooms or other ventilation systems.  In such a case it is common to use a butterfly valve tweaked to close very rapidly.  

It IS impressive to see a 36" butterfly snap shut in 0.2 seconds.  Also a good idea to call the local seismographic office ahead of time. smile   ..it makes an impressive "clang", in addition to all the noise from the air flowing from the actuator.    

RE: Emergency Valve Selection

(OP)
Thank you.
I have some idea of emergency 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