1 Scope
This part specifies the procedures and conditions to be followed for the validation by analysis and testing of
— the specified safety functions,
— the category achieved, and
— the performance level achieved
by the safety-related parts of a control system (SRP/CS) designed in accordance with GB/T 16855.1.
Note: Additional requirements for programmable electronic systems, including embedded software, are given in GB/T 16855.1-2008, 4.6, and GB/T 20438.
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 15706-2012 Safety of Machinery – General Principles for Design – Risk Assessment and Risk Reduction (ISO 12100:2010, IDT)
GB/T 16855.1-2008 Safety Of Machinery – Safety-Related Parts of Control Systems – Part 1: General Principles for Design (ISO 13849-1:2006, IDT)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 15706-2012 and GB/T 16855.1-2008 apply.
4 Validation Process
4.1 Validation Principles
The purpose of the validation process is to confirm that the design of the SRP/CS supports the overall safety requirements specification for the machinery.
The validation shall demonstrate that each SRP/CS meets the requirements of GB/T 16855.1 and, in particular, the following:
a) the specified safety characteristics of the safety functions provided by that part, as set out in the design rationale;
b) the requirements of the specified performance level (see GB/T 16855.1-2008, 4.5):
1) the requirements of the specified category (see GB/T 16855.1-2008, 6.2),
2) the measures for control and avoidance of systematic failures (see GB/T 16855.1-2008, Appendix G),
Foreword i
Introduction ii
1 Scope
2 Normative References
3 Terms and Definitions
4 Validation Process
4.1 Validation Principles
4.2 Validation Plan
4.3 Generic Fault Lists
4.4 Specific Fault Lists
4.5 Information for Validation
4.6 Validation Record
5 Validation by Analysis
5.1 General
5.2 Analysis Techniques
6 Validation by Testing
6.1 General
6.2 Measurement Accuracy
6.3 More Stringent Requirements
6.4 Number of Test Samples
7 Validation of Safety Requirements Specification for Safety Functions
8 Validation of Safety Functions
9 Validation of Performance Levels and Categories
9.1 Analysis and Testing
9.2 Validation of Category Specifications
9.3 Validation of MTTFd, DCavg and CCF
9.4 Validation of Measures against Systematic Failures Related to Performance Level and Category of SRP/CS
9.5 Validation of Safety-Related Software
9.6 Validation and Verification of Performance Level
9.7 Validation of Combination of Safety-Related Parts
10 Validation of Environmental Requirements
11 Validation of Maintenance Requirements
12 Validation of Technical Documentation and Information for Use
Appendix A (Informative) Validation Tools for Mechanical Systems
Appendix B (Informative) Validation Tools for Pneumatic Systems
Appendix C (Informative) Validation Tools for Hydraulic Systems
Appendix D (Informative) Validation Tools for Electrical Systems
Appendix E (Informative) Example of Validation of Fault Behaviour and Diagnostic Means
Bibliography
