Diameter selection

Solving this problem requires considering the following factors: 1) the properties of the fluid (in this case, nitrogen, which we know is an ideal gas). 2) Injection pressure and the pressure in the target tank (no specific values are given here, so we assume that the injection pressure is higher than that of the target tank and remains stable, which ensures gas flow). 3) Flow rate (related to velocity, pipe size, and the pressure difference in the gas flow; it is generally determined through practical experience or by consulting relevant engineering manuals). This problem is not just a pure mathematical issue; it involves fluid dynamics and the laws governing gas flow. We are unable to provide a specific answer directly, as it also depends on practical engineering conditions and operating parameters such as pressure difference, frictional resistance, and flow velocity limits. In practical environments, it is generally necessary to use some engineering software (such as ANSYS) or seek the help of professionals in related fields for calculations and design. In this regard, I recommend consulting relevant speed and bandwidth engineers for a more accurate answer, or providing a more detailed description of your specific situation and the parameters you need to consider; this way I might be able to offer more specific advice or assistance. .