Multi Hole Orifice Pressure Drop 1

[herman74]

Hi

I have an orifice on a sea water discharge line in order to reduce the pressure to the one present in a downstream common discharge.
Since the pressure drop and the flow rate are quite high (3 bar; 12500 m3/h), our supplier have provided us a DN 1400 orifice, 40 mm thickness, with 253 holes with diameter of 20 mm.

I want to verify this choice (also for personal culture), so I searched our library and goggled the net but I was not able to find a formula that could permit to find the pressure drop of a multi hole orifice as a function of:

-) diameter of the single hole
-) number of the holes
-) thickness of the orifice (length of the hole)

Can anyone help me on this topic.

Thanks in advance

Ermanno

 

[simo78]

Many thanks casflo for your answer! are you still studing orifices plates? have you other references on this topic, please?
unfortunately I have not many references:
Ball J.W. (1973), Tullis J.P. (1975)
Fratino U. (1999, 2000)

 

[casflo]

simo 78, try in

http://www.ihsesdu.com

and look for the paper ESDU 81039 titled "Flow of liquids. Pressure losses across orifice plates, perforated plates and thick orifice plates in ducts".
Regards.