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


NFPA 496 - Z-purge for H2 Distribution Valve Box Controller

NFPA 496 - Z-purge for H2 Distribution Valve Box Controller

NFPA 496 - Z-purge for H2 Distribution Valve Box Controller

Hello everybody,

The client has a hydrogen distribution valve box (DVB) that is supplied with a controller (screen display, inputs/outputs configuration, EMO, SCADA, etc.)
The controller box comes with an option for a Z-purge (nitrogen). DVB and controller are located in a flammable room with adequate ventilation (Class I Div 2).

I'm trying to figure out whether or not this comptroller requires a nitrogen purge. I'm thinking that if it is Class I Div2, it does not require the purge. Am I wrong?

I design aqueducts in a parallel universe.

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