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Homepage>BS Standards>23 FLUID SYSTEMS AND COMPONENTS FOR GENERAL USE>23.060 Valves>23.060.01 Valves in general>23/30466470 DC BS EN 17955 Industrial valves. Functional safety of safety-related valves and actuators
immediate downloadReleased: 2023-02-09
23/30466470 DC BS EN 17955 Industrial valves. Functional safety of safety-related valves and actuators

23/30466470 DC

BS EN 17955 Industrial valves. Functional safety of safety-related valves and actuators

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Standard number:23/30466470 DC
Pages:72
Released:2023-02-09
Status:Draft for Comment
DESCRIPTION

23/30466470 DC


This standard 23/30466470 DC BS EN 17955 Industrial valves. Functional safety of safety-related valves and actuators is classified in these ICS categories:
  • 23.060.01 Valves in general
This standard defines procedures and methods with which all relevant mechanical components of automated industrial valve packages that are used as final elements in a safety instrumented system can be evaluated according to the rules of EN 61508 Parts 1, 2, 4, 6 and 7 in order to integrate them into a safety instrumented system (SIS). It provides a method to determine all relevant factors, associated with the product, to be fully taken into account and thereby meet the specific needs of users of the product. The basic prerequisite for the application of this standard is that the intended use is known. This standard describes a system to avoid systematic faults conforming to the targeted Safety Integrity Level. The standard applies to automated industrial valve packages that are used as final elements in a safety instrumented system. It can be applied to single components (e.g. valve, actuator or mechanical parts of solenoid valves) or to assemblies of several of these components and interconnecting parts (e.g. gears, adaptors, brackets, etc.). Electrical, electronic or programmable electronic parts have to be assessed according to EN 61508. This standard does not apply to: • Manually operated valves, • Components in safety systems or risk-reducing devices that are not assessed and operated according to the principles of functional safety. (E.g. automatic safety valves like pressure relief valves). The methods described can also be used for other mechanical components in a final element of the safety instrumented system if the applicability is confirmed by appropriate expert knowledge. (E.g dampers, brakes, clutches, …).