GB/T 21109.2-2007 Functional safety—Safety instrumented systems for the process industry sector—Part 2:Guidelines for the application of GB/T 21109.1 (English Version)
1 Scope
This part provides guidance on the specification, design, installation, operation and maintenance of safety instrumented functions and related safety instrumented system as defined in GB/T 21109.1. To facilitate use of GB/T 21109, the clause and subclause numbers provided are identical to the corresponding normative text in GB/T 21109.1 (excluding the annexes).
2 Normative references
See GB/T 21109.1.
3 Terms, definitions and abbreviations
See GB/T 21109.1 for the terms, definitions and abbreviations. The following terms in GB/T 21109.1-2007 are explained in this part.
3.2.68
safety function
A safety function shall prevent a specified hazardous event. For example, “prevent the pressure in vessel #ABC456 exceeding 100 bar.” A safety function may be achieved by
a) a single safety instrumented system (SIS), or
b) one or more safety instrumented systems and/or other layers of protection.
In case b), each safety instrumented system or other layer of protection shall be capable of achieving the safety function and the overall combination has to achieve the required risk reduction (process safety target).
3.2.71
safety instrumented function
Safety instrumented functions are derived from the safety function, have an associated safety integrity level (SIL) and are carried out by a specific safety instrumented system (SIS). For example, “close valve #XY123 within 5 s when pressure in vessel #ABC456 reaches 100 bar”. Note that components of a safety instrumented system may be used by more than one safety instrumented function.
Foreword I
Introduction II
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
4 Conformance to GB/T 21109
5 Management of functional safety
5.1 Objective
5.2 Requirements
6 Safety life-cycle requirements
6.1 Objectives
6.2 Requirements
7 Verification
7.1 Objective
8 Process hazard and risk assessment
8.1 Objectives
8.2 Requirements
9 Allocation of safety functions to protection layers
9.1 Objective
9.2 Requirements of the allocation process
9.3 Additional requirements for safety integrity level 4
9.4 Requirement on the basic process control system as a layer of protection
9.5 Requirements for preventing common cause, common mode and dependent failures
10 SIS safety requirements specification
10.1 Objective
10.2 General requirements
10.3 SIS safety requirements
11 SIS design and engineering
11.1 Objective
11.2 General requirements
11.3 Requirements for system behaviour on detection of a fault
11.4 Requirements for hardware fault tolerance
11.5 Requirements for selection of components and subsystems
11.6 Field devices
11.7 Interfaces
11.8 Maintenance or testing design requirements
11.9 SIF probability of failure
12 Requirements for application software, including selection criteria for utility software
12.1 Application software safety lifecycle requirements
12.2 Application software safety requirements specification
12.3 Application software safety validation planning
12.4 Application software design and development
12.5 Integration of the application software with the SIS subsystem
12.6 FPL and LVL software modification procedures
12.7 Application software verification
13 Factory acceptance testing (FAT)
13.1 Objectives
13.2 Recommendations
14 SIS installation and commissioning
14.1 Objectives
14.2 Requirements
15 SIS safety validation
15.1 Objective
15.2 Requirements
16 SIS operation and maintenance
16.1 Objective
16.2 Requirements
16.3 Proof testing and inspection
17 SIS modification
17.1 Objective
17.2 Requirements
18 SIS decommissioning
18.1 Objective
18.2 Requirements
19 Information and documentation requirements
19.1 Objectives
19.2 Requirements
Annex A (Informative) Example of techniques for calculating the probability of failure on demand for a safety instrumented function
Annex B (Informative) Typical SIS architecture development
Annex C (Informative) Application features of a safety PLC
Annex D (Informative) Example of SIS logic solver application software development methodology
Annex E (Informative) Example of development of externally configured diagnostics for a safety-configured PE logic solver
Figure 1 Overall framework of GB/T 21109 IV
Figure 2 BPCS function and initiating cause independence illustration
Figure 3 Software development life cycle (the V-model)
Figure B.1 Model used to achieve SIL
Figure C.1 Logic solver
Figure E.1 EWDT timing diagram
Table 1 Typical Safety Manual organisation and contents
Table B.1 Typical SIS lifecycle steps
Standard
GB/T 21109.2-2007 Functional safety—Safety instrumented systems for the process industry sector—Part 2:Guidelines for the application of GB/T 21109.1 (English Version)
Standard No.
GB/T 21109.2-2007
Status
superseded
Language
English
File Format
PDF
Word Count
22500 words
Price(USD)
670.0
Implemented on
2008-4-1
Delivery
via email in 1 business day
Detail of GB/T 21109.2-2007
Standard No.
GB/T 21109.2-2007
English Name
Functional safety—Safety instrumented systems for the process industry sector—Part 2:Guidelines for the application of GB/T 21109.1
1 Scope
This part provides guidance on the specification, design, installation, operation and maintenance of safety instrumented functions and related safety instrumented system as defined in GB/T 21109.1. To facilitate use of GB/T 21109, the clause and subclause numbers provided are identical to the corresponding normative text in GB/T 21109.1 (excluding the annexes).
2 Normative references
See GB/T 21109.1.
3 Terms, definitions and abbreviations
See GB/T 21109.1 for the terms, definitions and abbreviations. The following terms in GB/T 21109.1-2007 are explained in this part.
3.2.68
safety function
A safety function shall prevent a specified hazardous event. For example, “prevent the pressure in vessel #ABC456 exceeding 100 bar.” A safety function may be achieved by
a) a single safety instrumented system (SIS), or
b) one or more safety instrumented systems and/or other layers of protection.
In case b), each safety instrumented system or other layer of protection shall be capable of achieving the safety function and the overall combination has to achieve the required risk reduction (process safety target).
3.2.71
safety instrumented function
Safety instrumented functions are derived from the safety function, have an associated safety integrity level (SIL) and are carried out by a specific safety instrumented system (SIS). For example, “close valve #XY123 within 5 s when pressure in vessel #ABC456 reaches 100 bar”. Note that components of a safety instrumented system may be used by more than one safety instrumented function.
Contents of GB/T 21109.2-2007
Foreword I
Introduction II
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
4 Conformance to GB/T 21109
5 Management of functional safety
5.1 Objective
5.2 Requirements
6 Safety life-cycle requirements
6.1 Objectives
6.2 Requirements
7 Verification
7.1 Objective
8 Process hazard and risk assessment
8.1 Objectives
8.2 Requirements
9 Allocation of safety functions to protection layers
9.1 Objective
9.2 Requirements of the allocation process
9.3 Additional requirements for safety integrity level 4
9.4 Requirement on the basic process control system as a layer of protection
9.5 Requirements for preventing common cause, common mode and dependent failures
10 SIS safety requirements specification
10.1 Objective
10.2 General requirements
10.3 SIS safety requirements
11 SIS design and engineering
11.1 Objective
11.2 General requirements
11.3 Requirements for system behaviour on detection of a fault
11.4 Requirements for hardware fault tolerance
11.5 Requirements for selection of components and subsystems
11.6 Field devices
11.7 Interfaces
11.8 Maintenance or testing design requirements
11.9 SIF probability of failure
12 Requirements for application software, including selection criteria for utility software
12.1 Application software safety lifecycle requirements
12.2 Application software safety requirements specification
12.3 Application software safety validation planning
12.4 Application software design and development
12.5 Integration of the application software with the SIS subsystem
12.6 FPL and LVL software modification procedures
12.7 Application software verification
13 Factory acceptance testing (FAT)
13.1 Objectives
13.2 Recommendations
14 SIS installation and commissioning
14.1 Objectives
14.2 Requirements
15 SIS safety validation
15.1 Objective
15.2 Requirements
16 SIS operation and maintenance
16.1 Objective
16.2 Requirements
16.3 Proof testing and inspection
17 SIS modification
17.1 Objective
17.2 Requirements
18 SIS decommissioning
18.1 Objective
18.2 Requirements
19 Information and documentation requirements
19.1 Objectives
19.2 Requirements
Annex A (Informative) Example of techniques for calculating the probability of failure on demand for a safety instrumented function
Annex B (Informative) Typical SIS architecture development
Annex C (Informative) Application features of a safety PLC
Annex D (Informative) Example of SIS logic solver application software development methodology
Annex E (Informative) Example of development of externally configured diagnostics for a safety-configured PE logic solver
Figure 1 Overall framework of GB/T 21109 IV
Figure 2 BPCS function and initiating cause independence illustration
Figure 3 Software development life cycle (the V-model)
Figure B.1 Model used to achieve SIL
Figure C.1 Logic solver
Figure E.1 EWDT timing diagram
Table 1 Typical Safety Manual organisation and contents
Table B.1 Typical SIS lifecycle steps
