Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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A Study on Establishing Target Reliability Levels for Flammable Gas Transmission Pipelines

가연성가스 수송배관에 대한 목표 신뢰도 수준 설정에 관한 연구

  • Lee, Jin-Han (Institute of Gas Safety R&D, Korea Gas Safety Corporation) ;
  • Jo, Young-Do (Institute of Gas Safety R&D, Korea Gas Safety Corporation) ;
  • Moon, Jong-Sam (Institute of Gas Safety R&D, Korea Gas Safety Corporation)
  • 이진한 (한국가스안전공사 가스안전연구원) ;
  • 조영도 (한국가스안전공사 가스안전연구원) ;
  • 문종삼 (한국가스안전공사 가스안전연구원)
  • Received : 2018.10.23
  • Accepted : 2018.12.06
  • Published : 2018.12.31
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Abstract

In reliability based design and assessment (RBDA) methodology, reliability targets are used to ensure that safety levels are met relevant limit states in the stage of design and maintenance. The target reliability for flammable gas pipelines have not been developed yet in Korea. Instead of the reliability targets, the tolerable criteria for risk measures such as societal and individual risk have been applied in pipeline risk management. This paper introduces the procedures to develop the target reliability using tolerable risk criteria for societal and individual risk which can be enforced for high pressure natural gas pipelines in quantitative risk assessment. In addition, we propose the target reliability for natural gas and hydrogen gas transmission pipelines by the procedures.

신뢰도 기반 접근법(RBDA)에서, 신뢰도 목표는 설계 및 유지관리 단계에서 관계되는 한계상태를 충족할 수 있는 정도의 안전 수준을 가지는 지 확인하기 위해서 사용된다. 우리나라의 경우 가연성 가스 배관에 대한 신뢰도 목표는 아직 개발되거나 활용되지 못하고 있다. 다만 신뢰도 목표 대신에 사회적 위험과 개인적 위험과 같은 위험 측정지표에 대한 허용가능(tolerable) 판단기준이 배관의 위험관리에 적용되어 왔다. 본 논문에서는 고압천연가스 배관에 대한 정량적 위험평가 시 판단기준으로 삼는 사회적, 개인적 위험 판단기준을 사용하여 신뢰도 기반 접근법의 핵심요소인 목표 신뢰도를 개발하는 절차를 소개하고 자 한다. 또한 소개된 절차를 통해 천연가스와 수소가스 수송배관에 대한 신뢰도 목표를 제안한다.

Keywords

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Fig. 1. Risk / Reliability estimation and management process.

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Fig. 2. Individual risk criteria for high pressure gas pipelines.

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Fig. 3. Societal risk criteria for high pressure gas pipelines.

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Fig. 4. Reliability targets for natural gas pipelines from Annex O of CSA Z662.

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Fig. 5. Illustration of the approach for estimating the expected number of fatalities.

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Fig. 6. Reliability targets as a function of population density based on societal risk.

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Fig. 7. Reliability targets as a function of population density based on individual risk.

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Fig. 8. Reliability targets from all two criteria considered for natural gas pipelines.

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Fig. 9. Reliability targets from all two criteria considered for hydrogen gas pipelines.

References

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