Regarding the issue of oxygen flow rate design
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There is a design issue regarding the oxygen flow rate in the plant; the theoretical calculations do not match the actual values. Please ask experts for help. Urgent! The current pipe diameter is 25, with a pressure of around 13 kilograms, at room temperature. What is the oxygen flow rate? If the flow rate is increased to 1200 m3/h, what diameter is required? I set the normal temperature to 27. Using the formula Q=S*v (where S is the cross-sectional area and v is the oxygen flow rate, with a maximum value of 25 m/s taken here), I calculated that the actual flow rate under industrial conditions for a pipe diameter of 25 is 44.16 m3/h. Then, using the formula P0V0/T0=P1V1/T1 (where 0 represents standard conditions and 1 represents actual conditions), ； Converted to standard flow rate: 562 m3/h ； Here’s the problem: in actual production, the flow rate indicated by the oxygen flow meter is around 750 m3/h, with a maximum value of 1000 m3/h ； It is clearly nearly twice the theoretical computational amount. What is the reason? Who can help me calculate it! The first step of the calculation already confused me, and I wasn’t able to proceed at all!
Your calculations are correct; it’s likely that there’s a problem with the flow meter. Or the actual pipe diameter may not match what you calculated.
I measured the pipe diameter on site, and there’s no problem. The flow meter always shows a value around 700-800. Unless there’s a problem right after buying it. Is it possible for the actual flow rate to exceed the theoretical value?
This post was last edited by ylb913 on 2016-5-24 at 12:45. 25 m/s is merely a safe flow rate for oxygen recommended in the standards; it does not mean that the flow rate of the gas can never exceed 25 m/s – there are cases where the gas flow rate reaches 100 m/s as well. The solution, assuming that the flow rate display is accurate, is either to reduce the flow volume or to expand the diameter of the pipeline so as to bring it below the safe flow speed.
This post was last edited by Thank goodness you're here on 2016-6-21 08:09. First, we need to verify the accuracy and precision of the flow meter. Our company has measuring equipment that can be used to calibrate its range free of charge, but this is only possible for flow meters based on thermal principles. If you need this service, feel free to contact me via private message