Some uncertainties regarding ethylene oxide in the petrochemical fire protection codes
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According to the petrochemical fire protection regulations, the outlet line of the ethylene oxide safety valve must be filled with nitrogen – this is hard to understand; whether it is for venting or connection to a flare system, how can filling it with nitrogen be achieved?
The pipeline behind the safety valve should normally be filled with nitrogen at a slight pressure, to prevent ethylene oxide from coming into contact with air after the safety valve activates and causing a secondary explosion
Perhaps a slight positive pressure, circulation, to prevent aggregation
It is related to the explosion lower and upper limits of ethylene oxide (I remember the upper limit for explosion to be 100%). There’s nothing that can be done at the upper explosion angle; one can only watch helplessly. Therefore, safety against explosions can only be ensured from the perspective of the lower explosion limit, such as by dilution with nitrogen.