Elasto-Plastic Deformation of a Liquid Ammonia Storage Tank

Year 2022, Volume: 63 Issue: 708, 540 - 559, 16.09.2022

Göksel Saraçoğlu

https://doi.org/10.46399/muhendismakina.1108194

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.

Keywords

Elasto-plastic deformation, liquid ammonia tank, the Bauschinger effect, low-pressure tank, rapid heating-cooling

Supporting Institution

The author declares that he has no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Bir Sıvı Amonyak Depolama Tankının Elasto-Plastik Deformasyonu

Abstract

Bu çalışma, bir kimyasal gübre fabrikasında kullanılan 10.000 ton kapasiteli çift cidarlı sıvı amonyak depolama tankının iç taban sacının elasto-plastik deformasyonunu sunmaktadır. Hammaddenin -33°C'de stoklandığı tankın taban sacında karşılaşılan problemin, tankın bir önceki iç bakım sonrası hızlı soğumaya maruz bırakılmasından kaynaklandığı tespit edilmiştir. Taban sacından kesilen numune üzerinde yapılan mekanik testler, plastik deformasyonun %1,94 oranında gerçekleştiğini ancak tokluğun değişiklik gerektirmeyen bir seviyede olduğunu göstermiştir. Bu nedenle ilgili standart API-620'nın belirttiği 1°C/saat ısıtma ve soğutma kuralına uyularak mevcut taban sacının kullanımına devam edilebileceği öngörülmüştür.

Keywords

Elasto-plastik deformasyon, Bauschinger etkisi, düşük basınçlı tank, hızlı ısıtma ve soğutma, amonyak tankı

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