3
Competence in Functional Safety
Functional safety of globe valves, rotary plug valves, ball valves and butterfly valves
Table of contents
1 Scope ...............................................................................................................................................................4
2 Validity of this manual ........................................................................................................................................4
3 Intended use of this manual .................................................................................................................................5
4 General aspects of functional safety.....................................................................................................................6
4.1 Standards, terms and abbreviations .............................................................................................................6
4.2 Determining the safety integrity level ............................................................................................................8
4.3 Hardware fault tolerance ............................................................................................................................9
5 Intended use of control valves in safety-instrumented systems ................................................................................10
5.1 General control valve requirements ............................................................................................................ 12
5.2 Globe valve requirements ..........................................................................................................................13
5.3 Ball valve requirements .............................................................................................................................15
5.4 Butterfly valve requirements .......................................................................................................................16
5.5 Rotary plug valve requirements ..................................................................................................................18
5.6 Proof tests and service life .........................................................................................................................18
6 Installation, piping and wiring ...........................................................................................................................19
6.1 Mechanical and pneumatic installation .......................................................................................................19
6.2 Electrical installation .................................................................................................................................20
6.3 Installation of control valves .......................................................................................................................20
7 Applicable device documentation ......................................................................................................................22
8 Appendix 1 – Manufacturer‘s declarations .........................................................................................................22
9 Appendix 2 − Example of a checklist for a final element ......................................................................................30
