关键词: 高压串低压, 保护层分析, 独立保护层, 共因失效

Abstract: The protective layer analysis (LOPA) method was used to identify the effectiveness of each protective layer in the dangerous scenario of high pressure string and low pressure in petrochemical plant. The LOPA method and its characteristics are introduced, and the failure data of various dangerous scenarios are compared according to the actual transformation cases. The total protection layer failure data is calculated according to the LOPA Settings in different series pressures. By exploring the better series pressure transformation scheme, the risk reduction in different scenarios can be identified effectively, and reasonable and effective improvement measures can be selected, which provides a theoretical basis for the high pressure series low pressure transformation of petrochemical equipment

Key words: high pressure string to low pressure, layers of protection analysis, independent protective layer, common cause failure