×
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

PRV Vent Pipe Termination Above roof???

PRV Vent Pipe Termination Above roof???

PRV Vent Pipe Termination Above roof???

(OP)
Gentleman,

What is an acceptable termination point above roof for the vent pipes for PRVs? Any help with this would be greatly appreciated, thank you.

-Tom
 

RE: PRV Vent Pipe Termination Above roof???

I think the most straightforward answer is the termination point needs to be where it cannot do harm when a release occurs.

In my opinion, that would mean a straight up discharge would need to be terminated 8' above the roof.

RE: PRV Vent Pipe Termination Above roof???

I would tend to agree with UtilityLouie about the height being greater than a man could reach but I will give you an example of one that is not.  If the prv has a great discharge size and then the attatched piping triples in size and has a greater volume than what could be released and or has a low velocity then it could be lower.  One other thing to consider is what you are actually releasing through your prv.  Depending on whether it is immenently dangerous to health your height might have to be even higher so that no single person can place themselves in harms way to purposly injure themselves.  I believe that NG and LPG have Jurisdictional Codes.  Maybe these thoughts will help.

Eric

RE: PRV Vent Pipe Termination Above roof???

Will the PRV be venting a product or is the vent only to allow the diaphragm to breath?
Many pressure reducing valves have vents that require to only breath with atmosphere. In this case, a screen will do.
If the vent is for an internal relief of product,then local codes would prevail for the product being released.
 

RE: PRV Vent Pipe Termination Above roof???

Tom "teekaypl"
Your question:
"What is an acceptable termination point above roof for the vent pipes for PRVs? Any help with this would be greatly appreciated, thank you."

Did not give us proper data needed to give a proper answer.
Example:
 - Is the state of the commodity being released a Fluid or gas?
 - Is the commodity a hydrocarbon or a toxic chemical
 - What is the temperature of the release?
 - What is the country where this project is located?
 - Roof of what kind of building?
 

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