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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 Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 20438.5: Historical versions
Similar standardsGB/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---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20438.5-2017 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 25.040 N 10 GB/T 20438.5-2017 / IEC 61508-5.2010 Replacing GB/T 20438.5-2006 Functional safety of electrical / electronic / programmable electronic safety-related systems - Part 5.Examples of methods for the determination of safety integrity levels (IEC 61508-5.2010, IDT) Issued on. DECEMBER 29, 2017 Implemented on. JULY 01, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 Introduction... 5 1 Scope... 8 2 Normative references... 10 3 Definitions and abbreviations... 10 Annex A (informative) Risk and safety integrity - General concepts... 11 Annex B (informative) Selection of methods for determining safety integrity level requirements... 26 Annex C (informative) ALARP and tolerable risk concepts... 30 Annex D (informative) Determination of safety integrity levels - A quantitative method... 34 Annex E (informative) Determination of safety integrity levels - Risk graph methods... 37 Annex F (informative) Semi-quantitative method using layer of protection analysis (LOPA)... 45 Annex G (informative) Determination of safety integrity levels - A qualitative method - hazardous event severity matrix... 52 Bibliography... 54ForewordGB/T 20438 "Functional safety of electrical/electronic/programmable electronic safety-related systems" consists of the following seven parts. - Part 1.General requirements; - Part 2.Requirements for electrical/electronic/programmable electronic safety-related systems; - Part 3.Software requirements; - Part 4.Definitions and abbreviations; - Part 5.Examples of methods for the determination of safety integrity levels; - Part 6.Guidelines on the application of GB/T 20438.2 and GB/T 20438.3; - Part 7.Overview of techniques and measures. This Part is Part 5 of GB/T 20438. This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 20438.5-2006 "Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 5. Examples of methods for the determination of safety integrity levels". Compared with GB/T 20438.5-2006, the main technical changes in this Part are as follows. - add the selection of methods for determining safety integrity level requirements (see Annex B); - add the risk analysis method. semi-quantitative method of protection layer analysis (LOPA) (see Annex F). This Part uses translation method to identically adopt IEC 61508-5.2010 "Functional safety of electrical/electronic/programmable electronic safety- related systems - Part 5.Examples of methods for the determination of safety integrity levels". This Part was proposed by China Machinery Industry Federation. This Part shall be under the jurisdiction of National Technical Committee on National Industrial Process Measurement Control and Automation of Standardization Administration of China (SAC/TC 124). The drafting organizations of this Part. Mechanical Industry Instrument and Meter Comprehensive Technology and Economic Research Institute, Beijing Guodian Zhishen Control Technology Co., Ltd., Hangzhou Hollysys Automation Co., Ltd., Beijing Labor Protection Science Research Institute, Risk Control (Beijing) Engineering Technology Co., Ltd., Beijing United Puken Engineering Technology Co., Ltd., Shanghai Zhonghu Electronics Co., Ltd., Siemens (China) Co., Ltd. Main drafters of this Part. Shi Xueling, Xiong Wenze, Jin Jianghong, Chen Yong, Yang Liu, Xiao Songqing, Zhou Youzheng, Mei Hao, Huang Jinsong, Lu Yi, Feng Xiaosheng, Luo An, Gu Zheng, Li Jia, Tian Yucong, Zuo Xin, Jiang Xuelian, Bai Yan. Version of standard substituted by this Part is. - GB/T 20438.5-2006.1 ScopeOne 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 referencesThe 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 abbreviationsFor 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. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 20438.5-2017 be delivered?Answer: The full copy PDF of English version of GB/T 20438.5-2017 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 20438.5-2017_English with my colleagues?Answer: Yes. 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