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Restricted Orifice Sizing And Installation Criteria

restricted orifice cooling water

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Posted 05 September 2017 - 12:00 AM

Hello experts,

In one of our cooling water system there are many exchanger and more-or-less everywhere the Cooling water is adequately supplied.

But in one exchanger, there is high flow going and because of this there is very less flow in the one of the other exchanger.

Moreover, there are butterfly valves for the isolation of exchangers and if we throttle it to restrict flow there is vibration observed.

Hence, we are thinking of inserting orifice plate to restrict flow in the exchanger.


I have few question pertaining to this.

1) Are there any installation criteria for restricted orifice because as such there is not sufficient straight length available at upstream or downstream of exchanger
2) How do i get into sizing of this orifice and on what basis should it be sized.


#2 Bobby Strain

Bobby Strain

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Posted 05 September 2017 - 09:02 AM

Did you throttle both inlet and outlet valves simultaneously? Crane has the method for restriction orifice sizing. Or, search this site or Google and you will find what you need.





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Posted 12 September 2017 - 03:21 AM

Thanks bobby for the answer, could you tell me from where can i get the method to calculate thickness of the restriction orifice plate.

#4 breizh


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Posted 12 September 2017 - 06:18 AM

Hi ,

Consider this resource ,


R.W. Miller formula for orifice plate thickness calculation

tmin ≥ SQRT [(0.681-0.651*BETA)*deltaP/Y] * pipe ID


tmin = min plate thickness [mm]
BETA = ratio of orifice hole diameter to pipe diameter
deltaP = pressure drop [MPa]
Y = plate material yield stress [MPa]
Pipe ID = pipe internal diameter [mm]




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