Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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A Study on the Availability Modelling and Assessment with Failure Density Function of Major Equipment for a Sewage Treatment Plant

하수처리장 주요 기자재의 고장확률밀도함수를 이용한 가용도 모델링 및 평가에 관한 연구

  • Lee, Hong-Cheol (Environmental Engineering Research Division, Korea Institute of Construction Technology) ;
  • Kwak, Pilljae (Environmental Engineering Research Division, Korea Institute of Construction Technology) ;
  • Lee, Hyundong (Environmental Engineering Research Division, Korea Institute of Construction Technology) ;
  • Hwang, In-Ju (Environmental Engineering Research Division, Korea Institute of Construction Technology)
  • 이홍철 (한국건설기술연구원 환경연구실) ;
  • 곽필재 (한국건설기술연구원 환경연구실) ;
  • 이현동 (한국건설기술연구원 환경연구실) ;
  • 황인주 (한국건설기술연구원 환경연구실)
  • Received : 2012.11.09
  • Accepted : 2013.10.17
  • Published : 2013.11.30
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Abstract

The simulation investigation on the availability with failure density function of major equipment for a sewage treatment plant has been carried out. This study focuses on the availability of the plant and criticality with equipment module induced by component layout and its failure function. The equipment classification of sewage treatment plant and its failure function are established. Also solution methodologies are introduced as Monte-Carlo simulation method and event algorithm for uncertainty problem. The availability in the case of serial connection of equipment with all exponential function is calculated as around 50.4%. In other case of parallel combination with back up equipment, the availability showed over 80.1%. The criticality that a ffects availability showed high value over 77% in the dehydration and concentration process of sludge.

본 논문에서는 하수처리장 주요 장비 고장밀도함수를 기반으로 시스템 가용성 평가가 수행되었다. 프로세스 구성과 구성요소의 고장률에 따른 시스템 가용성 및 위험요소 분석에 초점을 맞추고 있다. 하수처리장 시스템 가용성 분석을 위하여 기자재 분류와 해당기자재의 고장확률밀도함수를 정립하였다. 가용성 평가 과정의 불확실성의 해소를 위하여 몬테카를로 시뮬레이션 기법과 이벤트기법을 도입하였다. 하수처리장 시스템 가용성은 구성장비가 직렬연결 상태인 경우에 50.4%로 평가되었으며, 장비별 보조시스템이 추가 적용된 경우 80.1% 이상으로 증가하였다. 슬러지 탈수 및 농축 공정의 시스템 오작동은 전체 시스템 오작동의 77% 이상에 해당하고 있어 주 위험 요인으로 평가되었다.

Keywords

References

  1. Kang, K. W., Yoon, M. O., Lee, H. C. and Hwang, I. J., "A study on the availability with failure rate of process for LNG plant," Kor. Air-Conditioning Refri. Eng., 24(4), 358-363(2012). https://doi.org/10.6110/KJACR.2012.24.4.358
  2. Lee, H. C. and Hwang, I. J., A study on the evaluation of RAM performance for test-bed of LNG plant, Proceeding of SAREK 2011 Summer Conference, pp. 281-284(2011).
  3. Sharma, R. M. and Kumar, S., "Performance modeling in critical engineering systems using RAM analysis," Reliability Eng. Syst. Safety., 93, 891-897(2008).
  4. Borgonovo, E., Marseguerra, M. and Zio, E., "A Monte Carlo methodological approach to plant availability modeling with maintenance, aging and obsolescence," Reliability Eng. Syst. Safety., 67, 61-73(2000). https://doi.org/10.1016/S0951-8320(99)00046-0
  5. Lee, H. C. and Hwang, I. J., A study on the applicability of RAM evaluation based on reliability theory for LNG plant test-bed, Proceeding of SAREK 2011 Summer Conference, 277-28(2011).
  6. OREDA, 2009, Offshore reliability data 5th edition, SINTEF (2009).