×
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

dP Calculations trhough Valves with Multi-Phase Fluids
2

dP Calculations trhough Valves with Multi-Phase Fluids

dP Calculations trhough Valves with Multi-Phase Fluids

(OP)
Hey folks!  How do I calculate the pressure drop across a valve using a multi-phase fluid?

I am calculating pressure drops through ball valves and check valves, now I need to do the same for 3-way valves.  I am at a loss regarding pressure drop for the 3-way valve.  Also, after some deliberation, I wonder if the pressure drop across valves using liquid or gas is drastically different than a multi-phase fluid, such as oil/water/gas?  Any ideas?

RE: dP Calculations trhough Valves with Multi-Phase Fluids

2
Hey folks!  How do I calculate the pressure drop across a valve using a multi-phase fluid?

Use PipePhase with your favorite multiphase dP correlation, e.g. BBM.  Use the built-in k-factors in the device screens for the valve in question.  

I am calculating pressure drops through ball valves and check valves, now I need to do the same for 3-way valves.  I am at a loss regarding pressure drop for the 3-way valve.

You should be able to get the k-factor or the Cv for that valve from the valve manufacturer.  Call him up or look in the valve catalog.  Stick that k-factor or Cv into PipePhase on the valve device screen, push the blue arrow, and go to town.  I think there's also a Cv for a 3-way in the Cameron book.  Is your 3-way valve a Kimray?

Also, after some deliberation, I wonder if the pressure drop across valves using liquid or gas is drastically different than a multi-phase fluid, such as oil/water/gas?  Any ideas?

Shoot yes it's different.  Don't EVEN use the single-phase dP correlations (e.g. Darcy) for a multiphase fluid.  How much different is different?  Order of magnitude is 50% and I can defend that from field measurements vs. calculations.  Another thing - don't EVEN do two-phase dP calcs by hand.  It will take you hours.  Don't ask me how I know.  Why fart around with it if you don't have to?  You said you had PipePhase, now make that bad boy pay for itself!  



Thanks!
Pete
P. J. (Pete) Chandler, PE
Principal Engineer
Mechanical, Piping, Thermal, Hydraulics
Processes Unlimited International, Inc.
Bakersfield, California USA
pjchandl@prou.com

RE: dP Calculations trhough Valves with Multi-Phase Fluids

(OP)
Thanks again Pete!

RE: dP Calculations trhough Valves with Multi-Phase Fluids

No problem dude, just write back if you have any more questions.  - Pete

Thanks!
Pete
P. J. (Pete) Chandler, PE
Principal Engineer
Mechanical, Piping, Thermal, Hydraulics
Processes Unlimited International, Inc.
Bakersfield, California USA
pjchandl@prou.com

RE: dP Calculations trhough Valves with Multi-Phase Fluids

Dear all,
I am preparing a brief presentation on piping component. Any good reference/ ready made materials out there for me to grab/hold on  that I can use. Kindly seek assistance.
TQ

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