Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (7): 1034-1038.DOI: 10.12068/j.issn.1005-3026.2019.07.022

• Resources & Civil Engineering • Previous Articles     Next Articles

Determination of Safety Integrity Level of Ammonia Refrigeration System

LI Li, XU Kai-li, WANG Ben, YAO Xi-wen   

  1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2018-05-31 Revised:2018-05-31 Online:2019-07-15 Published:2019-07-16
  • Contact: XU Kai-li
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Abstract: The risk probability reduction quotient(Q○rpr)is defined during the evaluation of the safety integrity level, and the formula of Q○rpr is given. Q○rpr is used to characterize the reduction in the risk probability. The value of the Q○rpr corresponds to the failure probability required by the system safety integrity level, and then can be used to determine the safety integrity level. Integrating the Q○rpr calculation into the classical HAZOP-LOPA evaluation method can more accurately and quickly evaluate the safety integrity level of the system. This method is used to evaluate the safety integrity level of the ammonia refrigeration system. The leakage and explosion accidents in the ammonia refrigeration system were analyzed, and the safety integrity level of the safety-related system was evaluated to verify the effectiveness and feasibility of the method.

Key words: SIL(safety integrity level), risk probability reduction, HAZOP-LOPA, ammonia refrigeration, failure probability

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