| Title | The Estimation of the Material Corrosion Based on Previous Data and Compare with On-Site Test at Geothermal Field. |
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| Authors | N. Yanagisawa,Y. Masuda, K. Osato, M. Sato, K. Kasai, K. Sakura, T. Fukui |
| Year | 2016 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | corrosion rate, carbon steel, Kakkonda geothermal field, Cr equivalent, pH, temperature |
| Abstract | The material selection of pipeline and well in geothermal plant is important for risk management to prevent scale and corrosion problem. Especially, in acidic condition with high temperature region, the material corrosion problem becomes more serious. To solve this problem, we started the project of the Development of Geothermal Power Plant Risk Assessment System supported by NEDO from 2014. In this project, based on the data collected from 1974 to 2002 at AIST, we made calculation system to estimate the corrosion rate from pH, temperature and material component. And we try to compare the calcurated data with the on-site corrosion test at Kakkonda geothermal field at FY2015. The corrosion rate of carbon steel at Kakkonda is about 1.6mm/year at on-site examination under pH 3.6 and 145 ºC and match to the result of calculation based on previous data-base. On the other hand, TN80Cr13 and TN110Cr13S, the calculated corrosion rate is higher than the on-site corrosion rate. |