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?
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
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
RE: dP Calculations trhough Valves with Multi-Phase Fluids
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
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