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

Actuated Valve Tagging - ESD, SBV, etc.

Actuated Valve Tagging - ESD, SBV, etc.

Actuated Valve Tagging - ESD, SBV, etc.

Can someone help point me in the right direction on whether there is a standard on the proper naming convention for actuated valves that are used for certain purposes? For instance if an actuated valve is used for an emergency situation and meet certain criteria (such as it fails last) it must be labeled as ESD, or if an actuated valve is used to isolate but only closes when given the permissive, than it doesn't have to be labelled as ESD (although it would be used in an emergency situation).

I have tried to find something like this but I am having no luck so far. I have looked through CSA Z662 and so far I cannot find anything that that states a pressure limiting/protection valve needs to be labeled a certain way. I am thinking it is basically up to the operator to determine what the valve shall be labelled, so long as the proper testing/inspection/maintenance is completed on the valve, but I wasn't sure. Note that I have yet to search though my companies specifications to try and find something internal.

RE: Actuated Valve Tagging - ESD, SBV, etc.

The ANSI/ISA-5.01.01 (previously ISA 5.1) standard defines instrumentation symbols and identification. There are several copies of the standard available on the internet (Google). However, as far as I know, the ISA standard does not differentiate between EIV (emergency isolation valves) and EBDV (emergency blowdown valves), because they are basically identical valves but with different functions and fail-safe characteristics.

In several projects/plants I have been involved with, slightly different terminology was followed in each case - it was probably driven either by the existing tagging specification of the operator company, or it developed as a dedicated project specification for that particular project. For SIS actuated valves used for emergency isolation, I have come across the following symbols: EIV, ESDV, XV, ZV. For SIS actuated valves used for emergency blowdown, I have seen the symbols EBV, EBDV, XV, ZV. Manually operated valves were most commonly tagged as HV.

Process Engineer, MSChE

RE: Actuated Valve Tagging - ESD, SBV, etc.

You're confusing yourself. The designation of a valve does unfortunately change depening on clients and location. What you need to do is look at the function of the valve and what system it is dealing with. Lots of plants now have two separate systems - the ESD system with its own set of transmitters, valves and logic boards and the DCS or process control system.

In general the idea is the two shouldn't be mixed up. So yes, on an ESD event you can command, via the DCS, certain valves to close or open. However this is just additional back up. They are not "ESD" valves.

ESD valves should not be used for process or general isolation ppurposes, should fail in their safe position (without waiting for any external command) using some sort of local stored energy (usually a spring), generally are held in their non fail position, hence failure of the signal will "trip" them, and commonly require a local rest before they will go back to their non fail position.

All this is normally contained in the ESD and operating and control philosophy documents for the company / facility / design.

Because there are so many different situations, the codes don't specify this - as said look for an ESD philosophy and a control philosophy or something similar and this may spell out how your company does things.

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

RE: Actuated Valve Tagging - ESD, SBV, etc.

Thanks fellows. I found ISA 5.1 after my OP but I didn't find it helpful as it doesn't even discuss "emergency" and only discusses safety valves in terms of a spring PSV. As both you point out it looks like there is no real standard for "emergency" valves and it all comes down to our company standard (which I don't think there is one). This is something we will have to develop to prevent future confusion on what the valves main purpose is.

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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