Determining Valve Size for Natural Gas: V250 Rotary Ball Valve Calculation

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Calculating the valve size for a V250 rotary ball valve involves understanding the required volumetric flow rate of natural gas, which is 2.8 million liters per minute at standard temperature and pressure (STP). The density of natural gas at STP is 0.752 kg/m3, and the specific heat ratio is 1.31. The inlet and outlet pressures are 20 bar gauge and 6 bar gauge, respectively, with an inlet temperature of 20 °C. The initial step in the calculation is to determine the ratio between the volumetric flow rate and the gas density. Proper calculations are crucial for ensuring effective valve sizing and performance.
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I am struggling with calculating the valve size from a V250 rotary ball valve by Fisher Controls International. The below table states that natural gas is running through the vavle and the following properties apply:Natural Gas

Required volumetric flow rate [@ STP] 2.8 x 106 litre per minute
Density [@ STP] 0.752 kg per m3
Specific heat ratio 1.31
Inlet pressure 20 bar gauge
Outlet pressure 6 bar gauge
Inlet Temperature 20 °C

Would I be right in thinking that I need to find the ratio between the required volumetric flow rate and the density of the valve first?
 
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http://www.forberg.com/pdf/techSup/Home_Tech%20Support_Valve%20Flow_calc_and_sizing.pdf
 
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Dr. Courtney said:
http://www.forberg.com/pdf/techSup/Home_Tech%20Support_Valve%20Flow_calc_and_sizing.pdf

Thank you very much for the link - I'll take a look @ it.
 

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