Functional safety

Introduction to SILs for valve & actuator manufacturers

1-Day Training Course

Course description:

This course is specifically intended for valve and actuator manufacturers who are being asked to supply products with a Safety Integrity Level (‘SIL’) capability.

Part 1 is an overview of hazards, risks and SIL determination to help attendees understand where a ‘SIL’ comes from and the necessity of a proper specification prior to design. Lots of examples of safety instrumented functions in the process industry are given to illustrate the principles.

Part 2 (the main part) concerns the safety-related aspects of the design of the ‘final element’ in the safety instrumented system and hence how to achieve the specified ‘SIL capability’. Reliability modelling, assessment and quality system requirements are all covered.

Finally, Part 3 includes an overview of the regulatory framework, IEC 61508 and related standards (such as IEC 61511) and the various approaches used to demonstrate conformity.

Target audience:

The course is aimed at all those who are involved in the realization of valves, actuators and related accessories, such as design, reliability and quality engineers, technical managers and product applications specialists.

Supporting material:

Manuals based on the lecture slides together with supplementary information sheets are provided. Frequent question and answer sessions are included for clarification.

Training Course Outline

1. Determining the safety requirements
• Introduction to the course
• Hazards, risks, risk reduction, ALARP, risk criteria, SIFs and SILs
• Examples of SIFs and SIL determination (LOPA)
• The safety requirements specification (for the SIFs/SILs)
2. Designing SIL capability
• The generic SIS (sensor, logic and final element)
• How systems fail and the need for hardware and systematic integrity
• Subsystems, elements, architectures (HFT, SFF and Type)
• Failure rates and PFD calculations
• SIL capability data (example valve/actuator datasheets)
• The safety manual (functions/modes, failure data, instructions, restrictions and conditions)
• Estimating unit failure data by FMEDA
• Reliability modeling for actuated valve packages
• Proven-in-use data and justification
• Systematic integrity: QMS (ISO 9001 ‘plus’), lifecycle documentation, techniques and measures, and functional safety management
3. Regulatory, standards and compliance
• The legal position
• Standards overview (IEC 61508 and IEC 61511)
• Assessment and certification