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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