Safety Instrumented Systems: A Lifecycle Approach (EC50) focuses on the engineering requirements for the specification, design, analysis, and justification of safety instrumented systems (SIS) for the process industries. Students will learn how to determine safety integrity levels (SILs) and evaluate whether proposed or existing systems meet the performance and documentation requirements defined in the Functional Safety—Safety Instrumented Systems ISA/IEC 61511 (ISA 84) standard.
This course is part of the ISA/IEC 61511 SIS Fundamentals Specialist Certificate Program. Course registration includes one exam fee. Pass the exam and earn the ISA/IEC 61511 SIS Fundamentals Specialist Certificate designation.
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Classroom (EC50)Length: 4.5 days |
Virtual Classroom (EC50V)Length: 4.5 days |
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Learning Objectives
- Define safety instrumented system (SIS)
- Discuss how regulations have resulted through lessons learned from high profile process industry accidents
- Determine which ANSI/ISA, AIChE, and IEC guidelines and standards are relevant in industry
- Identify the scope of ISA/IEC 61511
- Discuss strategies for the management of functional safety
- Identify the stages of the safety design lifecycle
- Identify available safety layers for industrial automation and control systems (IACS)
- Discuss the importance of the "defense in depth" concept
- Identify how SISs are used to reduce risk
- Categorize risk using a process hazard analysis (PHA)
- Determine SIL using qualitative methods
- Determine performance requirements for each SIL
- Conduct a layers of protection analysis (LOPA)
- Discuss the LOPA methodology
- Develop guidelines for a LOPA
- Determine risk tolerance
- Identify resources for cybersecurity in an IACS
- Identify failure modes and the risks involved with each
- Identify hardware modeling techniques (SIL verification)
- Explain the impact of redundancy on failure rates
- Demonstrate the use of fault tolerance tables
- Develop a safety requirements specification (SRS)
- Explain the pros and cons of relay logic systems
- Explain the pros and cons of microprocessor systems
- Discuss the pros and cons of pneumatic systems
- Identify typical field devices in an IACS
- Discuss impact of field devices on system performance
- Explain the Center for Internet Security (CIS) benchmarks
- Explain the pros and cons of using certification vs. prior-use devices
- Explain the Factory Acceptance Test (FAT) process
- Explain the installation and commissioning process
- Explain the validation process
- Identify the priorities of the operation and maintenance phase
- Identify the safety requirements of a management of change (MOC) process
- Identify documents to maintain for SRS
Topics Covered
Background, Scope, Management Issues, Lifecycle
- High-profile process industry accidents
- Resulting legislation
- Lessons learned
Hazard and Risk Assessment, Selecting SILs
- Concepts and benefits of independent safety layers
- Hazard identification
- Risk assessment
- Safety integrity levels (SIL)
Layer Of Protection Analysis (LOPA) and Cybersecurity
- Semi-quantitative method of determining safety integrity levels called LOPA
Reliability and Modeling Issues
- Reliability issues
- Hardware fault tolerance requirement tables in the ISA84 standard
Safety Requirements Specification (SRS) and Logic Solver Technologies
- SRS review
- Pros and cons of pneumatic, relay, and microprocessor logic systems
Field Devices, Certification, Miscellaneous Design Issues
- Impact of field devices
- Differences between using certified vs. proven-in-use devices
Factory Acceptance Testing (FAT) and beyond
- FAT
- Installation
- Commission
- Validation
- Operations
- Maintenance
- Testing
- Bypassing
- MOC
Included Resources
- Online access to ISA/IEC 61511 standards for the duration of the course
- Safety Instrumented Systems: A Life Cycle Approach by Paul Gruhn, PE, CFSE and Simon Lucchini, CFSE, MIEAust CPEng (digital version)
A hand-held, scientific calculator should be brought to class.