Restriction orifice plate
Restriction orifice plate
(OP)
We have to design one (multiple?) restriction orifice plates in a DN150 (6"), 7 barg water line to reduce the pressure to 4 barg.
I do not have a copy of the BS/ISO standard readily available and am trying to look for other sources to calculate the orifice size. My initial questions are:
a) Is there a limitation of the pressure drop possible in single orifice plate? (I have a recollection of max dp = 0.75x upstream pressure - can't be sure if that was a rule of thumb or validated based on fluid mechanics)
b) struggling my way through to calculate flow coefficient (Cf) from 1st principle - suggestion/ web references will be much appreciated.
thanks,
I do not have a copy of the BS/ISO standard readily available and am trying to look for other sources to calculate the orifice size. My initial questions are:
a) Is there a limitation of the pressure drop possible in single orifice plate? (I have a recollection of max dp = 0.75x upstream pressure - can't be sure if that was a rule of thumb or validated based on fluid mechanics)
b) struggling my way through to calculate flow coefficient (Cf) from 1st principle - suggestion/ web references will be much appreciated.
thanks,





RE: Restriction orifice plate
http://
2) Search Eng-tips for this much (overly) discussed topic.
There are also tons of net references and a number of online calculators.
ISO 5167
http://www
3) Come back if you still have a question.
"If everything seems under control, you're just not moving fast enough."
- Mario Andretti- When asked about transient hydraulics
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RE: Restriction orifice plate
Regards,
athomas236
RE: Restriction orifice plate
The problem was discussed in thread378-125921: Multiple Inline Restriction Let-Down Orifices where a link was provided to download an article by Tung and Mikasinovic which gives a detailed design procedure.
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Restriction orifice plate
Katmar - the link for the technical paper in the old discussion thread does not work any longer (expected, the thread dates back to 2005). By chance, would you have a copy of the paper or any other reference?
thanks all once again, I am getting the confidence towards a correct design approach.
RE: Restriction orifice plate
Good luck,
Latexman