ORIFICE PLATE CALCULATION

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allianceautomation
Posts: 1
Joined: Sat Aug 21, 2010 10:40 am

ORIFICE PLATE CALCULATION

Post by allianceautomation » Sat Aug 21, 2010 11:07 am

Water Pump capacity 250LPM ,Head 30Mtr, Pipe line Bore40mm,
my DP Transmitter 5000mmH2O. How can i calculate Orifice plate bore dia.

admin
Site Admin
Posts: 366
Joined: Mon Feb 08, 2010 7:47 pm

Re: ORIFICE PLATE CALCULATION

Post by admin » Sat Aug 21, 2010 4:15 pm

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.
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ajay
Posts: 4
Joined: Tue Sep 07, 2010 12:04 pm

Re: ORIFICE PLATE CALCULATION

Post by ajay » Thu Sep 09, 2010 9:52 am

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

please suggest

Ajay

admin
Site Admin
Posts: 366
Joined: Mon Feb 08, 2010 7:47 pm

Re: ORIFICE PLATE CALCULATION

Post by admin » Thu Sep 09, 2010 8:46 pm

Yes, as expansion factor Y is calculated as given in theory page:
http://www.pipeflowcalculations.com/pip ... ifices.htm
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ketan j patel
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Joined: Sat Nov 03, 2012 12:56 pm

Re: ORIFICE PLATE CALCULATION

Post by ketan j patel » Sat Nov 03, 2012 1:14 pm

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

admin
Site Admin
Posts: 366
Joined: Mon Feb 08, 2010 7:47 pm

Re: ORIFICE PLATE CALCULATION

Post by admin » Sun Nov 04, 2012 8:28 am

What flow rates do you expect to have?
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vipulcpatel
Posts: 1
Joined: Fri Dec 14, 2018 5:15 pm

Re: ORIFICE PLATE CALCULATION

Post by vipulcpatel » Fri Dec 14, 2018 5:29 pm

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

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