Predicting gas leak at altitude

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Discussion Overview

The discussion revolves around predicting the rate of gas leak from a compressed air cylinder at an altitude of 8,000 feet compared to sea level. It touches on concepts related to gas flow, pressure differentials, and potential implications of altitude on leak rates.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Homework-related

Main Points Raised

  • One participant presents a scenario involving a cylinder leaking compressed air at sea level and seeks to understand how altitude affects the leak rate.
  • Another participant suggests that the original post may be homework-related and encourages the poster to show their work before receiving assistance.
  • A different participant argues that the flow rate remains unchanged at altitude, stating that the flow is choked and does not increase with a decrease in outlet pressure.
  • The original poster clarifies their intent, indicating they are a non-technical person seeking help rather than submitting homework.

Areas of Agreement / Disagreement

There is disagreement regarding whether the flow rate changes with altitude. Some participants assert that it does not change, while others imply that further exploration of the problem is needed.

Contextual Notes

Participants have not fully explored the assumptions regarding gas behavior at different pressures and altitudes, and the discussion lacks detailed mathematical analysis.

Who May Find This Useful

This discussion may be of interest to individuals exploring gas dynamics, those working with compressed gases, or anyone curious about the effects of altitude on gas flow rates.

maman
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I have a (faulty!) cylinder filled with compressed air at 2,000 psi which leaks at a rate of 1litre/minute at sea level. What would be the expected rate of leak at an altitude of 8,000ft? thanks for your help.
 
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Sounds like homework, perhaps you had better show some attempt at a solution before we help you...
 
Um... I don't see this as homework because the answer is way too simple. The answer is there's no change in flow rate. The flow is choked so there's no increase in flow with a decrease in outlet pressure.
 
thanks for your replies and apologies if it was posted in the wrong place. just a non-technical person, with a problem, stubbled on the website and hoped i could get a reply...
 

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