During two test periods Ningxia Petrochemical Company fertilizer plant CO2 compressor showed shaft seal leakages indicating that the CO2 gas contains too much water, contributing to CO2 compressor erosion damages. After catalyst dust caused fouling in the compressor, we examined if these phenomena in similar devices had happened. To solve the Ningxia Petrochemical Company CO2 compressor erosion damage and scaling issues, the cooler and the volume of separators should be increased in size to prevent the ammonia plant converter and shift catalyst dust entering the compressor. Also effective measures were take to reduce the formation of corrosion products from the equipment and piping of the CO2 washing section in the ammonia plant.