Calculate gas flow rate
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Can the gas flow rate be calculated given the pipe diameter and pipeline pressure?
Pressure, the pressure difference at both ends of the pipe, type of gas, temperature, and pipe diameter – for pipes carrying a specific type of gas, there are recommended flow rates; by using these recommended flow rates along with the pipe diameter, it is possible to calculate the flow rate.
Your conditions make it impossible to calculate anything; the valve at the back is closed, so the pressure is quite high, but there’s no flow at all.
If there is no pressure difference, it means the gas is not flowing; how can there be any flow rate then? You mean pressure difference, right? Parameters such as pipe diameter, pressure difference before and after, as well as physical properties like fluid viscosity and density can indeed be estimated