×
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

PSV Discharge Reducer

PSV Discharge Reducer

PSV Discharge Reducer

(OP)
Is it preferred that using Flat On Top Eccentric Reducer on psv discharge? Somebody disagree with me using concentric reducer on psv discharge.

Thanks!

RE: PSV Discharge Reducer

I disagree with using _any_ reducer on psv discharge.

Mike Halloran
Pembroke Pines, FL, USA

RE: PSV Discharge Reducer

I agree with MikeHalloran that unless you are using the reducer to increase the size of the discharge piping there is a problem with you installation. You have not given nearly enough information to rule out a concentric reducer.

Katmar Software - AioFlo Pipe Hydraulics
http://katmarsoftware.com

"An undefined problem has an infinite number of solutions"

RE: PSV Discharge Reducer

davidysong,
You've not made any reference to the code you are using, nor what the reducer is intended for. For instance ASME Section VIII, Appendix M-8 reports that discharge pipes shall be at least of the same size as the pressure relief valve outlet.

RE: PSV Discharge Reducer

(OP)
I am sorry I should have provided more detial information. This PSV is dicharged into a closed system, reducer is to increase discharge pipe size.

Thanks!

RE: PSV Discharge Reducer

Discharging a PSV into a closed system doesn't sound like a real good idea.

Mike Halloran
Pembroke Pines, FL, USA

RE: PSV Discharge Reducer

Mike,

So far as I am aware, every PSV in offshore installations and in most modern refineries discharge into a closed collection system, then via a KO drum to a vent / flare.

RE: PSV Discharge Reducer

If there's a vent, the system is not closed.

It probably doesn't matter. We don't know if the system under discussion is offshore, onshore, in a refinery, undersea, or airborne. We don't even know the state of whatever fluid comes out of the PSV, nor the state and pressure of whatever fluid the PSV is holding back.

I suppose we could guess that the fluid is not completely gaseous, because of the expressed concern about flat up/ flat down/ eccentric expanders, but beyond that, who knows?.



Mike Halloran
Pembroke Pines, FL, USA

RE: PSV Discharge Reducer

OK its a bit confusing i agree - under the assumption that its gas and in order to reduce the risk of having liquids that collect at the PSV nozzle and either freezes or causes corrosion i agree that an eccentric top flat reducer would be optimal (assuming its on the horizontal pipespool but i don't recall seeing this specified on P&IDs that i have come across.

RE: PSV Discharge Reducer

MortenA,
Someone correct me if I am wrong but I do not think the orientation of an Eccentric Reducer is a P&ID comment issue.
The proper orientation of an Eccentric Reducer (no matter where it is installed) is the responsibility of a well trained and experienced Piping Layout Designer.

prognosis: Lead or Lag

RE: PSV Discharge Reducer

I would show if it was an eccentric reducer and i would show if it was top or bottom flat. But i wouldt show if the pipe it was attached to was horizontal or vertilcal. When its important i would show a slope (direction and inclination). There is no fixed rules for P&IDs except those that companies make up for themselfs.

RE: PSV Discharge Reducer

(OP)
thanks for all replies.

MortenA, If there is a vent valve right after reducer, is it still prefered using an eccentric top flat reducer?

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