- #1
Compressed air flowrate calculation
- Thread starter Durgaprasad123
- Start date
In summary, the conversation discusses the flow rate in a 25mm diameter pipe with a pressure reducing valve set at 5 bar. The physicist asks for clarification on the units used and the length of the pipe. The engineer suggests using pressure drop calculations to determine the flow rate, but notes that the rest of the system must also be considered. The conversation then shifts to the surface finish and length of the pipe, with an online estimator providing a rough estimate of 0.47 m3/minute for 1 kilometer and 10.1 m3/minute for 3 meters of pipe. The engineer points out that the flow rate will decrease as the second vessel is filled. Overall, the conversation highlights the importance of considering all relevant
- #2
BvU
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Hello Durgaprasad, 
To physicists you have to explain that you mean 'inner diameter in mm' when you use the term nB (nominal bore). A lot of us would think 25 nanobarn (i.e. an area ##25 \times 10^{-28} ## m2
)
How many km long is this 25 nB pipe ? makes a difference!
You can do a lot yourself with pressure drop calculations. I would concentrate on the lower pressure part of the pipe unless the valve is close to the exhaust point.
To physicists you have to explain that you mean 'inner diameter in mm' when you use the term nB (nominal bore). A lot of us would think 25 nanobarn (i.e. an area ##25 \times 10^{-28} ## m2
)How many km long is this 25 nB pipe ? makes a difference!
You can do a lot yourself with pressure drop calculations. I would concentrate on the lower pressure part of the pipe
unless the valve is close to the exhaust point.- #3
russ_watters
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The valve characteristics also matter, but the the point of a prv is to keep pressure constant as flow varies. So if what you have shown is sized properly, none of it is relevant to the question!
What we would need is what the rest of the system looks like.
What we would need is what the rest of the system looks like.
- #4
- #5
Asymptotic
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Pipe length from regulator outlet to exit?
Pipe ID surface finish? It makes a difference.
If ID is smooth, for 5 bar regulator setting with air exhausting to atmosphere an online estimator calculates about 0.47 m3/minute for 1 kilometer, and 10.1 m3/minute for 3 meters of pipe. This estimator doesn't capture all of the nuances, nor does it address at all this new aspect to your question, namely, flow rate as the second vessel is filled. Air flow will be at nearly the 'exhausting to atmosphere' rate at first, and drop to zero as vessel #2 pressurizes to the 5 bar source.
Pipe ID surface finish? It makes a difference.
If ID is smooth, for 5 bar regulator setting with air exhausting to atmosphere an online estimator calculates about 0.47 m3/minute for 1 kilometer, and 10.1 m3/minute for 3 meters of pipe. This estimator doesn't capture all of the nuances, nor does it address at all this new aspect to your question, namely, flow rate as the second vessel is filled. Air flow will be at nearly the 'exhausting to atmosphere' rate at first, and drop to zero as vessel #2 pressurizes to the 5 bar source.
- #6
BvU
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My neck hurts from the leaning 90 degrees sideways.
You now describe a completely different situation. And still haven't given the relevant dimensions.
You now describe a completely different situation. And still haven't given the relevant dimensions.
1. How is the compressed air flowrate calculated?
The compressed air flowrate is calculated by dividing the volume of air delivered by the compressor by the amount of time it takes to deliver that volume of air. This is typically measured in cubic feet per minute (CFM) or liters per minute (LPM).
2. What factors affect the compressed air flowrate?
The compressed air flowrate can be affected by a variety of factors, including the size and type of compressor, the pressure and temperature of the air, the diameter and length of the air pipe, and any restrictions or obstructions in the air system.
3. How can I determine the required compressed air flowrate for my application?
The required compressed air flowrate for your application will depend on factors such as the air consumption of the tools or equipment being used, the desired pressure and flow rate, and any additional factors that may affect the flowrate, such as air leaks or fluctuations in demand. Consulting with a compressed air specialist or using online calculators can help determine the necessary flowrate for your specific application.
4. Can the compressed air flowrate be increased?
Yes, the compressed air flowrate can be increased by adjusting the compressor settings, installing a larger compressor, or optimizing the air system by removing restrictions or fixing leaks. However, it is important to ensure that the increased flowrate does not exceed the capacity of the system and cause damage or inefficiency.
5. How can I measure the compressed air flowrate?
The compressed air flowrate can be measured using a flow meter, which measures the volume of air passing through a specific point in the system. Additionally, the flowrate can be estimated using pressure and temperature readings, but this method may not be as accurate as using a flow meter.
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