Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Structural Integrity Evaluation of Large Main Steam Piping by Water Hammering

수격 현상에 근거한 대형 주증기관의 구조건전성 평가

  • Jo, Jong-Hyun (Dept. of Mechanical Design Engineering, Chungnam Nat'l Univ.) ;
  • Lee, Young-Shin (Dept. of Mechanical Design Engineering, Chungnam Nat'l Univ.) ;
  • Kim, Yeon-Whan (KEPCO Research Institute (KEPRI)) ;
  • Jin, Hai Lan (Dept. of Mechanical Design Engineering, Chungnam Nat'l Univ.)
  • 조종현 (충남대학교 기계설계공학과) ;
  • 이영신 (충남대학교 기계설계공학과) ;
  • 김연환 (한국전력공사 전력연구원 엔지니어링센터) ;
  • 김해란 (충남대학교 기계설계공학과)
  • Received : 2012.04.19
  • Accepted : 2012.06.13
  • Published : 2012.09.01
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Abstract

A main steam pipe system is a branch pipe that connects a boiler with a turbine. Water hammering analysis is very important for limiting the damage caused to pipe systems by operation conditions. Water hammering created by an unsteady flow in pipeline systems can cause excessive change in pressure, vibration, and noise. The main steam pipe structure should be designed to safely maintain the pressure pulsation and several vibrations under operation environments. This study evaluated the structural integrity of a main steam pipe during suspended and normal operation by using the ASME fatigue life methodology and finite element analysis. In the analysis, water hammering was used for transient analysis. The calculated alternating stress and fatigue stress were compared with the applicable limits of ASME fatigue life. All the evaluation results satisfied the requirements of the ASME fatigue life.

주증기관은 보일러와 터빈을 연결하는 주요계통이다. 운전조건으로 인한 배관시스템에 손상을 제한 할 수 있기 때문에 수격현상 해석은 중요하다. 배관시스템의 불안정한 유동에 의해 생성되는 수격현상은 압력의 과도한 변화, 진동 및 소음을 일으킬 수 있다. 주증기관 구조는 운전환경아래 압력맥동 및 여러 진동 등을 안전하게 견딜 수 있도록 설계되어야 한다. 본 논문에서는 정지 및 정상 운전기간 동안 배관에 유입되는 수격현상을 과도조건에 적용하여 ASME 피로수명 방법론과 유한요소해석에 따라 주증기관의 구조건전성을 평가하였다. 계산된 교번응력 및 피로응력 평가 결과, ASME 피로수명의 허용요건을 만족하였다.

Keywords

References

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