The purging nitrogen pipeline of ethylene glycol ethylene oxide loading platform of the unit is made of carbon steel, and there is rust in the pipeline. After contacting with ethylene oxide, it will accelerate the polymerization of ethylene oxide, resulting in blockage of the nitrogen pipeline. After the EO tank car is filled, the nitrogen is used to purge the EO filling pipeline and pressurize the EO tank car at the same time. Once the pipeline is blocked, the EO pipeline will not be purged cleanly, and the charging time of EO tanker will be too long. It is suggested that the material of nitrogen purging pipeline be upgraded from carbon steel to 304 stainless steel. The pipeline number involved is
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