抄録
In addition to traditional fertilizer applications, ammonia is being researched for use as a fuel for power generation, a storage medium for renewable energy, and particularly for the production and storage of hydrogen, leading to increased demand for large ammonia tanks. Ammonia has a tendency to cause Stress Corrosion Cracking (SCC) in high-strength steels. While this was not an issue for traditional applications such as 10,000 – 30,000 ton of storage tanks, it has become a concern with the current demand for larger tanks. We have recently carried out the design verification on a large-scale refrigerated liquid ammonia storage tank based on mild strength steel (A516 Grade 70N) and higher strength steels (A841 Class 2) using Thermo-Mechanical Control Process (TMCP). This paper describes various types of ammonia storage tank designs, trends in overseas ammonia tank design, design concepts and considerations for large-scale tanks, and also discusses preventive measures for ammonia SCC based on the results of laboratory tests.
