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### ORIFICE PLATE CALCULATION

Posted: **Sat Aug 21, 2010 11:07 am**

by **allianceautomation**

Water Pump capacity 250LPM ,Head 30Mtr, Pipe line Bore40mm,

my DP Transmitter 5000mmH2O. How can i calculate Orifice plate bore dia.

### Re: ORIFICE PLATE CALCULATION

Posted: **Sat Aug 21, 2010 4:15 pm**

by **admin**

Here is the report for orifice calculation for you data:

Orifice plate calculator CALCULATION REPORT

1. diameter (D1): D1 = 40 mm

2. diameter (D2): D2 = 5.55 mm

3. pressure on bigger diameter (p1): p1 = 10328.746 mmWS

4. pressure on smaller diameter (p2): p2 = 52274.996 Pa

5. pressure drop (p1-p2): p1-p2 = 5000 mmWS

6. kinematic viscosity (ν): ν = 1.006 mm2/s

7. dynamic viscosity (μ): μ = 1.2332191E-006 Pas

8. density (ρ): ρ = 1.2258638 kg/m3

9. volumetric flow rate (q): q = 248.452 l/min

10. mass flow rate (w): w = 0.0050761485 kg/s

11. velocity (V1): V1 = 3.295203 m/s

12. velocity (V2): V2 = 171.16548 m/s

13. Reynolds number (ReD): ReD = 131021.99

14. coefficient of discharge (Cd): Cd = 0.6054161

Use calculator at:

http://www.pipeflowcalculations.com/orifice/
and select liquid as flowing fluid

So your answer is 5.5 mm bore will create 5000 mmWS pressure drop with 250 l/m of flowing water.

### Re: ORIFICE PLATE CALCULATION

Posted: **Thu Sep 09, 2010 9:52 am**

by **ajay**

can we use same parameters for calculating the ORIFICE PLATE for gas line also

please suggest

Ajay

### Re: ORIFICE PLATE CALCULATION

Posted: **Thu Sep 09, 2010 8:46 pm**

by **admin**

Yes, as expansion factor Y is calculated as given in theory page:

http://www.pipeflowcalculations.com/pip ... ifices.htm

### Re: ORIFICE PLATE CALCULATION

Posted: **Sat Nov 03, 2012 1:14 pm**

by **ketan j patel**

I have pipe dia 4 inch, line pressure 3kg/cm^2 and i have DP transmitter with range of 0 to 10MPa so WHAT WILL BE diA OF ORIFICE PLATE FOR NATURAL GAS FLOW MEASUREMENT

### Re: ORIFICE PLATE CALCULATION

Posted: **Sun Nov 04, 2012 8:28 am**

by **admin**

What flow rates do you expect to have?

### Re: ORIFICE PLATE CALCULATION

Posted: **Fri Dec 14, 2018 5:29 pm**

by **vipulcpatel**

What will be the orifice diameter for steam line as per following data

Line size 4 Inch

Inlet pressure 4-10 kg/cm2

Temp 200-250°c

Flow rate 5-10 TPH