Replace nitrogen with hydrogen
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The device is about to be made airtight for hydrogen; what will happen to the nitrogen originally in the system once hydrogen is introduced into it?
First, release the system pressure, then introduce hydrogen gas
Is there a flare system? If so, discharge to the flare system after pressure relief!
The pressure should be released to a slightly positive level, around 10 to 20 kPa is sufficient; the pressure in the vent flare system is also roughly at this level. It’s okay not to use a torch
Pressure is released to the flare; there are also systems that use vacuum pumps, with hydrogen being introduced until the replacement is satisfactory~~~
Actually, direct replacement is also fine; since the hydrogen system is already airtight, it means hydrogen production has started, so it doesn’t matter – just go ahead with direct replacement
It’s also possible to introduce hydrogen directly without releasing nitrogen; in any case, it’s difficult for these two substances to react with each other, unless ammonia synthesis is involved
Release pressure to slightly positive pressure to displace it via the flare.
Release pressure to slightly positive pressure, then fill with hydrogen gas