Is the Flow Rate Across a Split Gas System Additive?

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SUMMARY

The flow rate across a split gas system is additive, meaning that the total flow rate measured at the source will equal the sum of the flow rates from each outlet hose. In the discussed scenario, a 1/2" source hose at 60 PSI splits into four 3/8" hoses, each limited to 30 SCFH. Therefore, the expected flow rate across the flow sensor will be 120 SCFH, assuming ideal gas behavior. This conclusion is based on the principles of gas laws and flow dynamics.

PREREQUISITES
  • Understanding of gas laws, particularly the ideal gas law
  • Knowledge of flow rate measurement techniques
  • Familiarity with flow sensors and their specifications
  • Basic principles of fluid dynamics
NEXT STEPS
  • Research the ideal gas law and its applications in flow systems
  • Learn about flow sensor calibration and accuracy
  • Explore the effects of pressure and diameter on flow rates in gas systems
  • Investigate the principles of fluid dynamics in split flow systems
USEFUL FOR

This discussion is beneficial for engineers, technicians, and anyone involved in gas system design and optimization, particularly those working with flow measurement and distribution in industrial applications.

Weld Engineer
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If I have a 1/2" source hose with 60PSI and a Flow sensor then split to four 3/8" hoses with a flow rate limited to 30SCFH. Should I expect to have a 120SCFH flow rate across my flow sensor? The gas will be 90% Argon/10%CO2, but we could assume an Ideal Gas for this... Right? I understand Metallurgy, but don't remember my gas laws very well.
 
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In general, the sum of the flows in the the four outlet hoses will be the flow value shown at the source regardless of whether this flow is equally distributed across those four outlet hoses or not.
 

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