×
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

Air Gap Required Distance for RPZ Drain

Air Gap Required Distance for RPZ Drain

Air Gap Required Distance for RPZ Drain

(OP)
Anyone know where I can find a code reference to the minimum air gap required for an RPZ relief drain? Having a hard time tracking it down. Thanks.

RE: Air Gap Required Distance for RPZ Drain

If this is in an International Plumbing Code enforced area, it is in chapter 8.

Typically, the distance is required to be 2X the size of the piping from the RPZ relief drain, i.e. a 1" drain ends 2" above the top of the drain/floor. I would also recommend the discharge pipe have a diagonal cut on the bottom to better direct the flow to the drain.

Another (sometimes) related issue is the size of the drain. Remember the RPZ can/will flow a lot of water if the valve fails. I have heard of 4" sanitary drains not being sufficient to handle the flow of an RPZ.

RE: Air Gap Required Distance for RPZ Drain

Normally, an RPZ already has an air gap between the body and the drain funnel. You do not need an additional gap at the termination of the drain.

RE: Air Gap Required Distance for RPZ Drain

traschcanman;

You are entirely correct and I have seen that approach used. However, I have also heard of some jurisdictions stating the air gap on the rpz is part of the assembly so a "separate" air gap is required at the waste receptor. It is redundant in my mind, but sometimes it is less expensive if time and frustration just to add the second air gap.

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