Since the two H2 sources contain some CO which is a poison to the downstream process, we plan to install a methanation unit to remove the CO. The methanation reaction will be done at 12kg/cm2A. Therefore, main H2 source pressure will need to be reduced while the off-gass pressure will be increased. (see attached file) When the 30kg/cm2A PSA H2 is reduced to 12 kg/cm2A, there will be choked flow. Also, the post-methanation H2 pressure will once again be reduced to 5 kg/cm2, thus another choked flow. After that, it is desirable that we can control its flowrate by an FCV (flow control valve). But for the FCV, I'm not quite sure, one question, do you use both of the source at the same time or not? since if you put the FCV at the downstream you may not be able to control the inlet flowrate to the methanation unit

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