인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
DBpia AI
AI 에이전트
AI 아이디어
AI 리더
AI 뷰어
Citeasy
크롬 서지관리 다운로드
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
피인용 0
초록·키워드
Average probability of dangerous failure on demand (PFD<sub>avg</sub> ) formula is derived in IEC 61508 edition 2.0 part 6 issued in 2010. But this formula is not consistent with the reality applied in safety instrumented function (SIF) design concept of process industry. Nowadays the safe detected failure, safe undetected failure and dangerous detected failure of sensor, logic solver and final element are designed to immediately lead to shutdown and system alarm in accordance with fail safe concept. But the PFD<sub>avg</sub> formula in IEC 61508 edition 2.0 is derived based on the condition that dangerous detected failure does not lead to shutdown for mean repair time (MRT) after failure. So the PFD <sub>avg</sub> formula shall need to be improved to suit the reality of plant. In this research, the PFD<sub>avg</sub> formula are derived by reliability block diagram (RBD) methodology considering that only dangerous undetected failure leads to accident. Common cause factor (β)and proof test coverage (PC) are included in PFD<sub>avg</sub> . The remaining two methodologies to determine result safety integrity level (SIL) like architectural constraint and systematic capability (SC) are excluded in this research. The votings discussed in this research are 1oo1, 1oo2, 2oo2, 2oo3 and 1oo3. The lower PFD<sub>avg </sub>will be derived by more realistic PFD<sub>avg</sub> formula than the formula in IEC 61508 edition 2.0 if new PFD<sub>avg</sub> is applied to real plant design. This new formula make the safer design and operation possible with the lower instrument investment cost.
본문·목차
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
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