Does “block off” mean “to close off”?
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For a short-term shutdown of the reactor, it can be sealed off and filled with process gas at a pressure slightly above atmospheric pressure.
It means to seal off, to block – handshake
It should mean “sealed,” indicating that when the reactor is shut down, its connection to the external process system must be severed, and it must be protected with process gas at a pressure slightly higher than atmospheric pressure. It can be understood as “reactor independent”.
The brother on the 3rd floor is right. Actually, this meaning is not hard to understand; the key is to figure out how to translate it in a proper and appropriate way. I think translating it as “isolate and seal the reactor” is more appropriate.
Reply to 4# Saiwai Jiangnan: I encountered the same problem as well; the play on the 3rd floor was great