SIL (safety integrity level) judgment method for safety-instrument system for LNG (liquefied natural gas) project

Abstract

The invention relates to an SIL (safety integrity level) assessment unit for a safety-instrument system for an LNG (liquefied natural gas) project. The SIL assessment unit comprises a project information management module, an HAZOP (hazard and operability analysis) result import module, an intermediate data management module, an SIL assessment calculation module, a database management module and an assessment result output module, wherein the project management information module is used for building an SIL analysis project; the HAZOP result import module is used for carrying out structured processing on the HAZOP analysis result of the SIL analysis project by taking a plot as a unit; the intermediate data management module is used for managing, inquiring and editing HAZOP analysis plots stored in the HAZOP result import module; the SIL assessment calculation module is used for carrying out assessment calculation aiming at each input HAZOP analysis plot by adopting an LOPA (layer of protection analysis) method, and obtaining the to-be-set SIL; the database management module is used for providing the acceptable risk frequency of an influence event, the initial event occurrence frequency and the failure probability reference value of an independent protective layer which are required for LOPA analysis; the assessment result output module is used for automatically generating an SIL assessment report. The SIL judgment method can be widely applied to SIL assessment of the safety-instrument system for the LNG project.

Description

technical field [0001] The invention relates to a method for judging a safety instrumented system SIL (safety integrity level), in particular to a method for judging a safety instrumented system SIL for an LNG (liquefied natural gas) project. Background technique [0002] In the field of engineering industry, emergency shutdown systems, fire and gas monitoring systems and other safety instrumented systems for the purpose of safety protection and suppression and mitigation of disasters have been widely used in different process or equipment protection occasions to protect personnel, production equipment and the environment. LNG projects involve low temperature (-165°C) and flammable media, so safety is very important. With the continuous development of the LNG industry, the scale of LNG devices and facilities is becoming larger and larger, and the requirements for automation are getting higher and higher. The corresponding SIS (Safety Instrumented System) is also getting more...

AI Technical Summary

Problems solved by technology

The calculation of SIL by the LOPA method requires the input of a large amount of reliability data of instruments and equipment. However, in the current LNG project design, there is a lack of corresponding data support. In many cases, it is still determined by the experience of analysts, and the subjective influence is also relatively large.

[0005] At the same time, whether it is the risk map method or the LOPA method, it mainly relies on manual analysis and recording at present, which is cumbersome to operate, heavy in workload, prone to errors, and has great limitations

In addition, the SIL judgment work usually refers to the HAZOP (Hazard and Operability Analysis) analysis results as a reference, but the two are often completed by two different groups of people, and there are often inconsistencies in scene definition and severity analysis. Good means to combine the two

Images