Seeking advice on the flow rate for high-pressure nitrogen pipelines?

When a compressible fluid flows through a control valve, at the point where the throttling cross-section is smallest, it can reach or exceed the speed of sound, thereby generating chaotic flow patterns such as shock waves, jet streams, and vortex flows. This medium is converted into thermal energy downstream of the orifice, simultaneously generating gas dynamic noise that is transmitted throughout the downstream piping. In severe cases, the pipeline system will be damaged due to excessive vibration. For steam and general gases, the selection of flow velocity depends on the fluid conditions, making it difficult to make a universal choice. The data below is provided only as a reference for selecting the pipe diameter of the control valve. Generally, a target speed of below 0.3 Mach is set, with 0.8 Mach as the upper limit during operation. When exceeding 0.3 Mach, noise is likely to occur, and noise calculations are required. When calculating the diameter of a control valve, it is important to determine the fluid flow rate. The fluid flow rate is related to factors such as the type of fluid, the valve pressure difference, and the piping on the outlet side of the valve. It has a significant impact on maintaining the performance of control valves, while preventing the generation of noise and valve vibration. The selection of flow rate is related to various factors such as fluid conditions, pipe diameter, and material, making it difficult to establish a universal standard. Coupled with economic considerations, it is therefore used only on an empirical basis.

The answer was too technical; although I didn’t fully understand it, it was still helpful. Thank you very much! I’m not sure if there are any specific standards for selecting valves in this regard