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This paper by Eisa Norozipour describes in detail a large disturbance in the high pressure synthesis equipment more specific in the HP CO2 stripper of a urea plant. The plant was restarted after 26 days overhaul activities. From high demand of urea and economical point of view the production of urea was very important at that time.

This paper describes the process troubleshooting and the author hopes this can be useful for the other urea plants in around the world.