We are developing a high purity hydrogen system (between the source and fab equipment) and need to determine the tube sizes. I have the peak flow rates and source/system pressures. How do I calculate this?

The short answer is that there are software based programs that utilize the Colebrook and Darcy Equations that can provide you an answer but you will need a layout to estimate the tube lengths and the number and types of fittings and valves in the system.    More information on this can be found here: https://www.criticalsystemsinc.com/determining-tube-pipe-size-for-pressurized-gas-system

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