Measure flow rate with a manometer (pressure gauge)

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SUMMARY

The discussion focuses on calculating the air flow rate of a leakage in a 50-liter volume pressurized to 1 bar, which subsequently drops to 0.5 bar over 30 seconds. The user seeks to determine the volume of air required to maintain the pressure and the flow rate of the leakage. It is established that the flow rate can be approximated by the volume difference needed to maintain the pressure, leading to a calculation of approximately 10 liters per minute as a hypothetical example.

PREREQUISITES
  • Understanding of basic fluid dynamics principles
  • Familiarity with pressure measurement using manometers
  • Knowledge of gas laws, particularly relating to pressure and volume
  • Ability to perform unit conversions and flow rate calculations
NEXT STEPS
  • Research the ideal gas law and its application in pressure-volume calculations
  • Learn about manometer calibration and accuracy in pressure measurement
  • Explore methods for detecting and quantifying leaks in pressurized systems
  • Study flow rate measurement techniques for gases, including orifice flow meters
USEFUL FOR

This discussion is beneficial for engineers, technicians, and anyone involved in fluid mechanics, particularly those working with pressurized systems and seeking to understand leakage dynamics and flow rate calculations.

Xefyros
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Hello!

I have a volume of 50 liters which I pressurize with air so that I read 1 bar on the manometer.
But there is a leakage in the volume so after 30 sec the manometer shows 0,5 bar.

What is then the air flow ( liter / min) of the leakage?
 
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The flow rate will change as the pressure difference changes.
 
scottdave said:
The flow rate will change as the pressure difference changes.

Hello, maybe bad explained but I would want to know if you can count how much air you have to fill up the 50 liter volume with to get 1 bar (over) pressure and then how much air that has left when the manometer reaches 0,5 bar.
So let's say that you need to fill up the volume with 10 liter for 1 bar and 5 liter for 0,5 bar pressure -> then over 30 seconds it has left 5 liter ( from 1 bar to 0,5 bar) and we would then have ~~10 liter / min
(just example numbers)
 

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