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


lockout/ tagout of pneumatic valves

lockout/ tagout of pneumatic valves

lockout/ tagout of pneumatic valves

Dear colleagues

Plant safety regulations require the de-energizing of system when working on it including pneumatic valves. a recommendation was made to introduce lockable isolating valves in the system but the requirement has been specified to lock the actual process valve. there are hundreds of valves in the plant, replacement will be expensive so i wanted to explore modification of valves to introduce the lockout/ tagout system on current valves.
i have attached 3 pics of typical valve types in the plant. please assist with modification concepts for lockout/tagout system on the valves

RE: lockout/ tagout of pneumatic valves

Since no block valves immediately next to these pneumatic valves for lock-out/tag-out, IMO, you may find the isolation valves by tracking further up and downstream of the process line for it.
The safety requires a physical block valve on the process line to hang the tags, but it could be located at some distance from the pneumatic valve

RE: lockout/ tagout of pneumatic valves

Cut the air line upstream from the pneumatic valves and place manual valves with levera that can be locked up.

RE: lockout/ tagout of pneumatic valves

Lock out manual pneumatic supply valve or remove the tubing from the valve. That will disable the actuator. You still have to address the notion of "process isolation" since control valves should never be used for isolation.

David Simpson, PE
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist

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!


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