Hello I have to calculate area req
Hello I have to calculate area req
(OP)
Hello
I have to calculate area required for an orifice . The downstream pressure is fixed. The flow is a multiphase flow of crude and steam.(Crude flowrate = 2000kg/hr and steam is 50kg/hr) If any standard sizing procedure is available, can anyone please share it ?
And can this be simulated in aspen hysys using a valve ?( if the orifice has multiple holes )
Thanks in advance !!
I have to calculate area required for an orifice . The downstream pressure is fixed. The flow is a multiphase flow of crude and steam.(Crude flowrate = 2000kg/hr and steam is 50kg/hr) If any standard sizing procedure is available, can anyone please share it ?
And can this be simulated in aspen hysys using a valve ?( if the orifice has multiple holes )
Thanks in advance !!
RE: Hello I have to calculate area req
A poster in the thread linked below asserts that instead of fl/D, you can use Kd in the Leung approach. I do not know if this is valid.
https://www.eng-tips.com/viewthread.cfm?qid=44972
An estimate of Kd is provided here:
https://www.inglenookeng.com/orifice-flow-for-two-...
Take note of the conditions of the testing that found the Kd. I do not know if the liquids used - i.e. a volatile liquid with measurable quality versus your case of two different fluids - would affect their proposed equation for determination of Kd.
Two-phase flow is tricky stuff. Using the above, I would do your best, but would also want to run a pilot test if possible to verify results before installing in the full-scale equipment.
RE: Hello I have to calculate area req
any idea if this can simulated in aspen hysys ?
RE: Hello I have to calculate area req
RE: Hello I have to calculate area req
Approximate value is okay(within 10-15%)
RE: Hello I have to calculate area req
*** Per ISO-4126, the generic term
'Safety Valve' is used regardless of application or design ***
*** 'Pressure-relief Valve' is the equivalent ASME/API term ***
RE: Hello I have to calculate area req
RE: Hello I have to calculate area req
You may find pointers in the link attached, possibly drop an email to the writer of this article.
https://www.controlglobal.com/measure/flow/article...
Pierre
RE: Hello I have to calculate area req
Another resource for orifice and two-phase stream.
Pierre
RE: Hello I have to calculate area req
Give up this idea. Choked 2-phase flow has not been studied properly and has no a proven math model. Simultaneous phase changes and sonic velocities are almost unable to be predicted with accuracy you seek. Some models do exist but those were created based on similarity criteria of 1-phase flows so no one knows actual accuracy of those.
Note that you are trying to control a crude oil having unstable and unknown composition. Look carefully at fluid properties you implement and an impact of those to result.
500-1000% - may be, 10-15% - no way.
Also note that sonic flow requires extra hardness of bore and no one has experience in deterioration of that. Projections - may be, experience - no way.
Wide industrial implementation of some technique requires extensive science studies and piloting. A problem you are trying to solve is subject of some Nobel Prize in far future.
RE: Hello I have to calculate area req
I will go through the articles @pierreick
RE: Hello I have to calculate area req
RE: Hello I have to calculate area req
RE: Hello I have to calculate area req
what is your recommendation? I believe orifice is not suitable for this application.
Pierre
RE: Hello I have to calculate area req
RE: Hello I have to calculate area req
RE: Hello I have to calculate area req
RE: Hello I have to calculate area req
Pressures and pressure difference and temperatures are important here, but two phase flow through an orifice is complex and gets worse the larger the pressure difference is. You provide no information.
Is this critical flow or sub critical?
Crude oil and Steam mix??
Is this new or has something changed?
What was used before?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Hello I have to calculate area req
I know the pressure that is to be maintained downstream of the orifice...I have to size the orifice and check how much is the back pressure in the nozzle and check upstream pressure required...the criteria is that the crude shouldn't vaporize at that upstream pressure at the inlet...
The pressure to be maintained downstream of the orifice is around 3 bar...and temperatures are in the range of 230C
This is not a project I am working on entirely(as I am new to the company)...only this nozzle part information has been given to me...I have no idea whether this a completely new design or the other department is just cross-checking the existing design...
Thanks once again to everyone for all your replies !!
RE: Hello I have to calculate area req
I would go back to whoever gave you this hospital pass and say not enough information and any calculations are subject to field trials.
Or install a control valve.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Hello I have to calculate area req
Its not going to work.
RE: Hello I have to calculate area req
Can you share a Pfd or Pid to vizualize your process? Do you need to stick to this technology of meter?
Pierre
RE: Hello I have to calculate area req
But as of now I don't have any PFD & PID with me
Thank you !!
RE: Hello I have to calculate area req
Probably good for you and others to take some time to read this book, available on internet.
Pierre
RE: Hello I have to calculate area req
Another resource about Industrial flow measurement with references.
Good luck
Pierre
RE: Hello I have to calculate area req
A poorly defined process, suggest the least of your worries are trying to size the piping components.