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Downtime data of ammonia and urea plants was collected and analysed for the 3-year period of 1999-2002. Downtime data with respect to plants related problem and external problem was segregated. A detailed analysis of equipment related problem was carried out to identify the areas and equipment in the plant which caused significant downtime. Analysis should help the plant management and equipment manufacturers to focus attention on design, material of construction, fabrication, maintenance and operation of the critical equipments. Energy consumption trends are also included to give an assessment of energy efficiency levels of the plants.