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현중섭(J. S. Hyun),송기욱(G. W. Song),박정현(J. H. Park),하정수(J. S. Ha) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.8
The piping system of fossil power plant is subject to a severe thermal range and usually operates well into the creep range. Cyclic operation of the plant subjects the piping system to mechanical and thermal fatigue mechanisms and poor or defective support assemblies can impose massive loads onto the system. In order to prevent the serious damage and failure of the critical pipe system in fossil power plants, 3-dimensional displacement measurement system was developed for the on-line monitoring. Two types displacement measurement systems were developed with LVDT type sensor and rotary encoder type sensors. These systems were installed and operated on the piping system of fossil power plant successfully.
허재실(J.S. Heo),현중섭(J.S. Hyun),허정렬(J.R. Heo),이성기(S.K. Lee),조선영(S.Y. Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
High temperature steam pipes of fossil power plant are subject to a severe thermal range and usually operates well into the creep range. Cyclic operation of the plant subjects the piping system to mechanical and thermal fatigue mechanisms and poor or mal functional support assemblies can impose massive loads or stress onto the piping system. In order to prevent the serious damage and failure of the critical pipe system, various inspection methods such as visual inspection, computational analysis and on-line piping displacement monitoring were developed. 3-Dimensional piping displacement monitoring system was developed with using the aluminum alloy rod and rotary encoder type sensors, this system was installed and operated on the Y fossil power plant successfully. It is expected that this study will contribute to the safety of piping system, which could minimize stress and extend the actual life of critical piping.
송기욱(K.W. Song),유근봉(K.B. You),현중섭(J.S. Hyun),장성호(S.H. Jang),하정수(J.S. Ha) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
Main steam pipe in power plants is subjected to service conditions under which creep processes take place limiting the component's lifetime. To ensure a safe and economic operation it is necessary to get accurate information about the lifetime situation of single components as well as of the whole system. Careful evaluation is combined with FEM analysis, NDT, microstructure evaluation. Especially, 14MoV63 steel is used as material for main steam pipe for 30 years old power plants. In service inspections have shown an increasing number of cracks and and creep cavities beside stress concentration parts. A detailed analysis came to the conclusion that lifetime has been consumed to a high degree, 80%level.
송기욱(G.W. Song),현중섭(J.S. Hyun),하정수(J.S. Ha),조선영(S.Y. Cho) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Most domestic fossil power plant have exceeded 100,000 hours of operation with the severe<br/> operating condition. Among the critical components of fossil power plant, high temperature steam pipe<br/> system have had a many problems and damage from unstable displacement behavior because of<br/> frequent start up and shut down. In order to prevent the serious damage and failure of the critical<br/> pipe system in fossil power plant, 3-dimensional displacement measurement system were developed for<br/> the on-line monitoring system. 3-D Measurement system was developed with using the LVDT type<br/> sensor and rotary encoder type sensor, this system was installed and operated on the real power plant<br/> successfully. In the future time, network system of on-line diagnosis for critical pipe will be designed.