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http://dx.doi.org/10.5855/ENERGY.2018.27.2.001

Risk Assessment Technique for Gas Fuel Supply System of Combined Cycle Power Plants (I) : Based on API RBI Procedures  

Song, Jung Soo (Graduate School, Chung-Ang University)
Yu, Jong Min (Graduate School, Chung-Ang University)
Han, Seung Youn (Technical Research Center, Safetia Co., Ltd.)
Choi, Jeong Woo (Technical Research Center, Safetia Co., Ltd.)
Yoon, Kee Bong (School of Mechanical Engineering, Chung-Ang University)
Publication Information
Journal of Energy Engineering / v.27, no.2, 2018 , pp. 1-13 More about this Journal
Abstract
The proportion of natural gas-fueled power generation is expanding due to the change of domestic energy policy pursuing reduction of dust and increasing clean energy consumption. Natural gas fuels used for the combined-cycle power plants and the district-heating power plants are operated at high temperature and high pressure in the fuel supply system. Accidents due to leakage of the gas such as fire and explosion should be prevented by applying risk management techniques. In this study, risk assessment was performed on the natural gas fuel supply system of a combined power plant based on the API RP 581 RBI code. For the application of the API RBI code, lines and segments of the evaluation target system were identified. Operational data and input information were analyzed for the calculations of probability of failure and consequence of failure. The results of the risk assessment were analyzed over time from the initial installation time. In the code-based evaluation, the gas fuel supply system was mainly affected by thinning, external damage, and mechanical fatigue damage mechanisms. As the operating time passes, the risk is expected to increase due to the external damage caused by the CUI(Corrosion Under Insulation).
Keywords
Risk; RBI(Risk-Based Inspection); CUI(Corrosion Under Insulation); Natural gas; CCPP(Combined Cycle Power Plant);
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