Participants will gain a comprehensive understanding of Safety Instrumented Systems (SIS), including functional safety concepts, Safety Integrity Level (SIL), lifecycle management, verification, validation, proof testing, and maintenance practices in accordance with IEC 61511.
A Safety Instrumented System (SIS) is a system comprising sensors, logic solvers and actuators whose purpose is to take a process to a safe state when normal predetermined set points are exceeded, or safe operating conditions are violated. The course will cover relevant standards, concepts, and practical applications in various industries.
Syllabus
DAY 1
1. Introduction
- Standards – IEC 61508, IEC 61511, ISA 84.01
- Philosophy of Safe Design
- Introduction to the Safety Lifecycle
- What are Safety Instrumented Systems?
- Basic Ideas about SIS
- Functional Safety
- Instrumented Systems & Safety Instrumented Systems
- BPCS and SIS
- Safety Instrumented Function
- Typical architecture
- Integrated BPCS & SIS
- Differences between BPCS & SIS
2. Safety Lifecycle
- Safety Lifecycle phases
- Activities within each phase
- Documentation requirements
DAY 2
1. Hazard and Risk Management
- Tolerable Risk
- Components of Risk
Consequence - Likelihood
- Risk Matrix and Risk Graph
- Risk Reduction
2. Process Risk
- Incidents – Causes & Consequences
- Preventative Controls (reduce frequency)
- Mitigative Controls – (reduce consequence)
- Bow-Tie Diagrams
3. Analysis Phase
- Determination of Tolerable Risk
- Hazard Identification
- Risk Analysis (frequency and consequence)
- Identifying Safety Instrumented Functions (SIF)
- Determining the Safety Integrity Level (SIL) using Layer of Protection
- Analysis (LOPA)
- Writing the Safety Requirement Specification
- Other Design Considerations
DAY 3
1. Realization Phase 1
- System Technologies – Relay, Solid State, Programmable
- Subsystems – Sensor, Logic Solver, Final Element
- Architectures – 1oo1, 1oo2, 2oo2, 2oo3
- Sensor Subsystem
- Logic Solver Subsystem
- Final Element Subsystem
- Effects of Field Devices on SIF Performance
- Common Cause – Separation, Diversity, Physical Environment
2. Reliability
- System Reliability Engineering
- Metrics / Parameters: Failure Rate, MTTF, MTTR, MTBF
- Failure Databank
- Reliability Block Diagrams
- Redundancy and Reliability
- Fault Tree Analysis
- Fault Tree Analysis Example- 1
- FTA and RBD
DAY 4
1. Realization Phase 2
- SIL Verification – PFDavg and Architectural Constraints
- Factory Acceptance Testing
- Commissioning
- Analysis Models
2. Operation Phase
- Maintenance
- Decommissioning
- Documentation
- Management of Change
- Calculate failure rate update from the actual failure data
3. Analysis Tool (Software)
- Overview of Software
- Functionality of Software
- Database