Abstract
This paper presents the elasto-plastic deformation of the inner bottom plate of a 10,000 tonnes capacity double wall liquid ammonia storage tank used in a chemical fertilizer plant. It has been determined that the problem encountered in the bottom plate of the tank where the raw material is stocked at -33°C is caused by the rapid cooling of the tank after the internal maintenance. Mechanical tests performed on the sample cut from the bottom plate showed that the plastic deformation occurred at a rate of 1.94%, but the toughness was at a level that did not require a change. Therefore, it is foreseen that the use of the bottom plate can be continued by complying with the 1°C/hour heating and cooling rule in accordance with the relevant standard API-620.
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