Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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SIS Design for Fuel Gas Supply System of Dual Fuel Engine based on Safety Integrity Level(SIL)

이중연료엔진의 연료가스공급시스템에 대한 안전무결도 기반 안전계장시스템 설계

  • Kang, Nak-Won (Institute of Ship & Ocean System Engineering, Korean Register of Shipping) ;
  • Park, Jae-Hong (Institute of Ship & Ocean System Engineering, Korean Register of Shipping) ;
  • Choung, Choung-Ho (Institute of Ship & Ocean System Engineering, Korean Register of Shipping) ;
  • Na, Seong (Institute of Ship & Ocean System Engineering, Korean Register of Shipping)
  • 강낙원 (한국선급 선박해양시스템연구원) ;
  • 박재홍 (한국선급 선박해양시스템연구원) ;
  • 정정호 (한국선급 선박해양시스템연구원) ;
  • 나성 (한국선급 선박해양시스템연구원)
  • Received : 2012.03.16
  • Accepted : 2012.10.29
  • Published : 2012.12.20
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Abstract

In this study, the shutdown system of the fuel gas supply system is designed based on the Safety Integrity Level of IEC 61508 and IEC 61511. First of all, the individual risk($10^{-4}$/year) and the risk matrix which are the risk acceptance criteria are set up for the qualitative risk assessment such as the HAZOP study. The natural gas leakage at the gas supply pipe is identified as the highest risk among the hazards identified through the HAZOP study and as a safety instrumented function the shutdown function for leakage was defined. SIL 2 and PFD($2.5{\cdot}10^{-3}$) for the shutdown function are determined by the layer of protection analysis(LOPA). The shutdown system(SIS) carrying out the shutdown function(SIF) is verified and designed according to qualitative and quantitative requirements of IEC 61508 and IEC 61511. As a result of SIL verification and SIS conceptual design, the shutdown system is composed of two gas detectors voted 1oo2, one programmable logic solver, and two shutdown valve voted 1oo2.

Keywords

References

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  1. Estimation of explosion risk potential in fuel gas supply systems for LNG fuelled ships vol.39, pp.9, 2015, https://doi.org/10.5916/jkosme.2015.39.9.918