危害与风险分析-HazardRiskAnalysis

1、Part 03 Hazard and Risk Analysis,Heidi Fuglum Certified Functional safety engineer,1 day intro training in Functional safety,Hazard and Risk Analysis,In this module How much safety is enough? Risk management Hazard identification Hazard Analysis Risk Reduction Techniques Risk graph, risk matrix Iden

2、tification safety function,Safety Lifecycle, where are we,SIL Determination,Hazard Identification,SIL Implementation,Overall Operation all logical ANDs,Safety Function,There are 5 basic properties Sense Logic Actuate Timing Safety Integrity (SIL),Safety Requirement Spesification - SRS,Definition of

3、Safety Requirement Specification, SRS IEC 61511 part 1, 3.2.78 specification that contains all the requirements of the safety instrumented functions that have to be performed by the safety instrumented systems Objective Specify all requirements of SIS needed for detailed engineering and process safe

4、ty information purposes,SRS Elements,The SRS contains two types of requirements Functional Requirements Description of the functions of the SIF How it should work Integrity Requirements The risk reduction and reliability requirements How well it should work,SRS Requirements,The SRS should contain th

5、ese functional requirements Definition of the safe state Process inputs and their trip points Process parameters normal operating range Process outputs and their actions Relationship between inputs and outputs Selection of energize-to-trip and reenergize-to-trip Response time requirement Operator in

6、terface requirement,SRS Requirements,The SRS should contain these functional requirements Considerations for manual shutdown Considerations for bypass and override Action on loss of power to the SIS Response time requirements for the SIS to bring the process to a safe state Response actions for over

7、t faults Reset functions,SRS requirement (cont),The SRS should contain these integrity requirements The required SIL for each SIF Requirements for diagnostics to achieve the required SIL Requirement for maintenance and testing to achieve the required SIL Reliability requirements if spurious trips may be hazardous,Hazard and Risk Analysis,In this module we looked at How to identify hazards How to analyze hazards That frequency * consequence = risk How to determine risk reduction That a risk matrix or graph