Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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A Study on the Achievement of Required Safety Integrity Level to Reduce Risk for SMR On-Site Hydrogen Refueling Stations

개질형 On-Site 수소충전소의 리스크 감소를 위해 요구되는 SIL 등급 달성 방안에 관한 연구

  • Lee, Jin Ho (Department of Safety Engineering, Seoul National University of Science and Technology) ;
  • Lim, Jae-Yong (Department of Safety Engineering, Seoul National University of Science and Technology)
  • 이진호 (서울과학기술대학교 안전공학과) ;
  • 임재용 (서울과학기술대학교 안전공학과)
  • Received : 2020.10.16
  • Accepted : 2020.12.21
  • Published : 2020.12.31
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Abstract

In recent years, hydrogen has received much attention as an alternative energy source to fossil fuels. In order to ensure safety from the increasing number of hydrogen refueling stations, prevention methods have been required. In this regard, this study suggested an approach to reduce the risk of hydrogen refueling station by increasing Safety Integrity Level (SIL) for a Steam Methane Reformer (SMR) in On-Site Hydrogen Refueling Station. The worst scenario in the SMR was selected by HAZOP and the required SIL for the worst scenario was identified by LOPA. To verify the required SIL, the PFDavg.(1/RRF) of Safety Instrumented System (SIS) in SMR was calculated by using realistic failure rate data of SIS. Next, several conditions were tested by varying the sensor redundancy and proof test interval reduction and their effects on risk reduction factor were investigated. Consequently, an improved condition, which were the redundancy of two-out-of-three and the proof test interval of twelve months, achieved the tolerable risk resulting in the magnitude of risk reduction factor ten times greater than that of the baseline condition.

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References

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