Is there a way to calculate gas flow rate from output PSI?

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SUMMARY

The discussion centers on calculating gas flow rate from output PSI, specifically for propane torches. It highlights a linear relationship between PSI and BTU/hr, exemplified by 18 PSI corresponding to 220,000 BTU/hr. However, it concludes that a general formula for calculating gas flow rate based solely on PSI is not feasible due to the absence of critical parameters. The conversation emphasizes the complexity of gas flow calculations and the need for additional data.

PREREQUISITES
  • Understanding of BTU (British Thermal Unit) and its relation to gas flow.
  • Knowledge of gas pressure measurements in PSI (pounds per square inch).
  • Familiarity with propane properties and combustion characteristics.
  • Basic principles of fluid dynamics as they relate to gas flow.
NEXT STEPS
  • Research the relationship between PSI and BTU/hr for various gas types.
  • Learn about the factors affecting gas flow rate, including temperature and orifice size.
  • Explore fluid dynamics principles relevant to gas flow calculations.
  • Investigate specific formulas for calculating gas flow rates in combustion applications.
USEFUL FOR

This discussion is beneficial for engineers, HVAC professionals, and anyone involved in the design or optimization of gas-burning appliances, particularly those working with propane systems.

Xtensity
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I've noticed that certain propane torches will have a seemingly linear relationship between their PSI and BTU/hr. IE, 18 PSI -> 220,000 BTU/hr. From this a person could calculate how much gas is being burned per sec/minute/hr.

So, is there a general relationship/formula that I can use to calculate gas flow rate based off the PSI? Like if I have a propane tank releasing propane at a pressure of 25 PSI, how could I calculate how much weight in propane is being burned per second (without knowing the ratios in the first paragraph)?
 
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Xtensity said:
So, is there a general relationship/formula that I can use to calculate gas flow rate based off the PSI?

No. You're missing quite a number of parameters.
 

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