×
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

Modeling a PRV in a steady state analysis

Modeling a PRV in a steady state analysis

Modeling a PRV in a steady state analysis

(OP)
Hey guys, I'm new to the forum and am in need of some tips here. I am using WaterCAD to model a new water distribution system for a subdivision. The initial results of my model tell me that I need some Pressure Reducing Valves...the only problem is that the PRV's close instantaneously due to the pressures exceeding my controls; thus disconnecting the rest of my system.

Are there any other ways to model PRV's in steady state analysis...Thanks!

RE: Modeling a PRV in a steady state analysis

(OP)
Well, I've never used EPAnet...

RE: Modeling a PRV in a steady state analysis

Sorry.. WaterCAD. I've never used either of them.  I can force a valve to move to a particular % open, thus changing the Cv.

BigInchworm-born in the trenches.
http://virtualpipeline.spaces.msn.com

RE: Modeling a PRV in a steady state analysis

(OP)
I just checked and unfortunately, the valves are modeled as either off or on...

RE: Modeling a PRV in a steady state analysis

Bad news.

Can you change the Cv or Valve size?  Maybe you can use a full open 4" valve to simulate a 12" at 25% open or something.

BigInchworm-born in the trenches.
http://virtualpipeline.spaces.msn.com

RE: Modeling a PRV in a steady state analysis

Can you give a breif description of the system? I'll give it a shot w/ Water CAD.

RE: Modeling a PRV in a steady state analysis

Tylerz28ss
I would check the controls on the prv, It should self modulate to give the desired results.  if it is closing, is it backwords?  do you have demands on both sides of the valve? is your source stable?
Hydrae

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