Log In

Come Join Us!

Are you an
Engineering professional?
Join Engine-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!

*Engine-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

Determining Pressure Rating (PN) of Valves and Pipes (Water)

Determining Pressure Rating (PN) of Valves and Pipes (Water)

Determining Pressure Rating (PN) of Valves and Pipes (Water)

Hello guys,
Hope you're all doing well.

For as long as I remember, the rule of thumb for determining the PN of pipes and valves is 1.5 times the working pressure in the network. But lately I've been digging deeper. So here's my question:
How do you guys determine the pressure rating of the pipes/valves (discharge side of the pump. Water.):
A - 1.5 x pump head
or (another factor) x pump head
B- 1.5 x pump shut-off head
or (another factor) x pump shut-off head
C- 1.5 x (maximum surge pressure with surge protection)
or (another factor) x (maximum surge pressure with surge protection)

Any specific code of standard that mandates this?

Moreover, some engineers add the suction pressure to the pump head in order to estimate the PN. Do you agree? When I normally selected my pump, it's at the intersection of the system curve with the pump curve. And, as we know, the system curve already reflects the suction pressure from its starting point at the Y-axis. So, to get the pressure at the pump discharge, do we really need to ADD the suction pressure to the pump produced head? (the intersection point already reflects the suction pressure, is what I am saying). I might be missing something (?)

Hope you're having great holidays!

RE: Determining Pressure Rating (PN) of Valves and Pipes (Water)

You should delete this, and your other post and re-post in forum378: Pipelines, Piping and Fluid Mechanics engineering

Please do not duplicate postings, as that tends to cause confusion and replication. The entire forum list can be found here /forumlist.cfm

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Engine-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://engine-tips.com/forumlist.cfm

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 Engine-Tips Forums free from inappropriate posts.
The Engine-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Engine-Tips forums is a member-only feature.

Click Here to join Engine-Tips and talk with other members! Already a Member? Login


Engineering as It Should Be - Chapter 2: Document Security
This ebook covers basic 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. Chapter 2 covers cybersecurity and answers the question: How do you secure your files and documents? Download Now

Close Box

Join Engine-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 Engine-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close