GB/T 20438.5-2017Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 5: Examples of methods for the determination of safety integrity levels (English PDF)
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Issued by
General Administration of Quality Supervision, Inspection and Quarantine
Level / Type
National · Recommended
Issue date
December 29, 2017
Implementation date
July 1, 2018
Scope
GB/T 20438.5-2017 (Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 5: Examples of methods for the determination of safety integrity levels) is available as an English-translated PDF.
GB/T 20438.5-2017 is the Chinese standard "Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 5: Examples of methods for the determination of safety integrity levels".
Its scope clause reads: One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications.
In this context, the requirements, test methods or test conditions of this basic safety publication will not apply unless specifically referred to or included in the publications prepared by those technical committees. Its clauses include definitions and abbreviations.
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Document preview — GB/T 20438.5-2017
National Standard of the People's Republic of China
- ICS
- 25.040
- Classification
- N 10
Issued by: General Administration of Quality Supervision, Inspection and Quarantine
Contents
- Foreword3
- Introduction5
- 1 Scope8
- 2 Normative references10
- 3 Definitions and abbreviations10
- Annex A (informative) Risk and safety integrity - General concepts11
- requirements26
- Annex C (informative) ALARP and tolerable risk concepts30
- method34
- methods37
- analysis (LOPA)45
- method - hazardous event severity matrix52
- Bibliography54
1 Scope
One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications.
In this context, the requirements, test methods or test conditions of this basic safety publication will not apply unless specifically referred to or included in the publications prepared by those technical committees.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 20438.1-2017, Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1.General requirements (IEC 61508-
1.2010, IDT)
3 Definitions and abbreviations
For the purposes of this document, the definitions and abbreviations given in
GB/T 20438.4-2017 apply.
Annex A (informative)
Risk and safety integrity - General concepts
This annex provides information on the underlying concepts of risk and the relationship of risk to safety integrity.
Annex B (informative)
Selection of methods for determining safety integrity level requirements
This annex lists a number of techniques that can be used for determination of safety integrity levels. None of the methods are suitable for all applications and users will need to select the most suitable. In selecting the most appropriate method consideration should be given to the following factors.
Annex C (informative)
ALARP and tolerable risk concepts
This annex considers one particular approach to the achievement of a tolerable risk. The intention is not to provide a definitive account of the method but rather an illustration of the general principles.
GB/T 20438.3-2017 | GB/T 20438.6-2017 | GB/T 20438.4-2017 | GB/T 20438.7-2017 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 11 pages — is available in the English PDF.
Referenced standards
Normative references
IEC 61508
Cited by
- GB/T 35850.1-2018Programmable electronic systems in safety-related applications for lifts (elevators), escalators and moving walks -- Part 1: Lifts (elevators) (PESSRAL)
- NB/T 25019-2014Technical specification for turbine instrument and control of nuclear power plant
- GB/Z 29638-2013Functional safety of electrical/electronic/programmable electronic safety-related systems -- Functional safety and GB/T 20438
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Related Standards
GB/T 20438.1-2017 — Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 1: General requirements
GB/T 20438.2-2017 — Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems
GB/T 20438.3-2017 — Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 3: Software requirements
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GB/T 20438.5-2017
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