## Featured Articles

Check out the latest featured articles.

## New Article

Product Viscosity vs. Shear

## Featured File

Vertical Tank Selection

## New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

5

# Restricted Orifice Sizing And Installation Criteria

restricted orifice cooling water

11 replies to this topic
|

### #1 CSNK

CSNK

Gold Member

• Members
• 73 posts

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.

Regards,

### #2 Bobby Strain

Bobby Strain

Gold Member

• Members
• 2,867 posts

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.

Bobby

### #3 CSNK

CSNK

Gold Member

• Members
• 73 posts

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

breizh

Gold Member

• ChE Plus Subscriber
• 4,638 posts

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

where

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]

Breizh

### #5 River123

River123

Brand New Member

• Members
• 1 posts

Posted 21 August 2019 - 11:50 AM

There is an app in microsoft store to calculate the thickness of restriction orifice plate.

### #6 Nikolai T

Nikolai T

Gold Member

• Members
• 124 posts

Posted 21 August 2019 - 07:13 PM

Hello,

Is outlet cooling water under pressure? What is the temperature of hot stream? Did you try to throttle outlet valve (cooling water)?

Regards

### #7 PhilippM

PhilippM

Gold Member

• Members
• 98 posts

Posted 21 August 2019 - 11:20 PM

The topic is almost two years old...

Brand New Member

• Members
• 4 posts

Posted 13 February 2020 - 09:11 AM

Hello!

Can anyone please help me with Tung and Mikasinovic article from Chemical Engineering, December 12, 1983, pgs 69-71

and Mink, Chem. Eng Aug 25, 1980, p91?

i have to calculate an restriction orifice but i want to see the background formulas.

Have a nice day!

### #9 Bobby Strain

Bobby Strain

Gold Member

• Members
• 2,867 posts

Posted 13 February 2020 - 09:48 AM

There is such on my website for gases. You can download it by first registering.

Bobby

Brand New Member

• Members
• 4 posts

Posted 14 February 2020 - 01:56 AM

Hello,

Have a nice day!

### #11 breizh

breizh

Gold Member

• ChE Plus Subscriber
• 4,638 posts

Posted 14 February 2020 - 03:17 AM

Just use your favorite search engine , let say Google bobby strain and your will find  www.bobby-strain-group.com.

note : same for the documents requested use your search engine .

other resource : Crane TP 410 M

Good luck

Breizh

#### Attached Files

Edited by breizh, 14 February 2020 - 03:37 AM.

Brand New Member

• Members
• 4 posts

Posted 14 February 2020 - 05:03 AM

Hello,