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

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SUMMARY

The discussion focuses on calculating the appropriate size for a V250 rotary ball valve by Fisher Controls International for natural gas applications. Key parameters include a required volumetric flow rate of 2.8 x 106 liters per minute, a density of 0.752 kg/m3, an inlet pressure of 20 bar gauge, an outlet pressure of 6 bar gauge, and an inlet temperature of 20 °C. The initial step in the calculation involves determining the ratio between the volumetric flow rate and the density of the gas. Resources for further guidance on valve flow calculations are also provided.

PREREQUISITES
  • Understanding of fluid dynamics principles
  • Familiarity with natural gas properties
  • Knowledge of pressure measurement units (bar gauge)
  • Experience with valve sizing calculations
NEXT STEPS
  • Study the flow characteristics of natural gas using the V250 rotary ball valve
  • Learn about the calculation methods for valve sizing in gas applications
  • Research the impact of pressure drops on valve performance
  • Explore the use of software tools for valve sizing and flow calculations
USEFUL FOR

Engineers, HVAC professionals, and anyone involved in the design and sizing of valves for natural gas systems will benefit from this discussion.

gillmitch92
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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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