CIC344 Safety Instrumented Systems Syllabus:

CIC344 Safety Instrumented Systems Syllabus – Anna University Regulation 2021

COURSE OBJECTIVES:

1. To make the students aware of basic concepts of safety instrumented system, standards and risk analysis techniques.
2. To make the students understand different layers of protection.
3. To make student conscious about safety instrumentation applications.
4. To make the students aware of potential events and impact of failures.
5. To make students aware of design, installation and maintenance procedures.

UNIT I INTRODUCTION

Safety Instrumented System (SIS): need, features, components, difference between basic process control system and SIS – Risk: how to measure risk, risk tolerance, Safety integrity level, safety instrumented functions – Standards and Regulation – HSE-PES, AICHE-CCPS, IEC61508, ANSI/ISA-84.00.01-2004 (IEC 61511 Mod) & ANSI/ISA – 84.01-1996, NFPA 85, API RP 556, API RP 14C, OSHA (29 CFR 1910.119 – Process Safety Management of Highly Hazardous Chemicals – SIS design cycle – Process Control vs Safety Control.

UNIT II PROTECTION LAYERS AND SAFETY REQUIREMENT SPECIFICATIONS

Prevention Layers: Process Plant Design, Process Control System, Alarm Systems, Procedures, Shutdown/Interlock/Instrumented Systems (Safety Instrumented Systems – SIS), Physical Protection – Mitigation Layers: Containment Systems, Scrubbers and Flares, Fire and Gas (F&G) Systems, Evacuation Procedures – Safety specification requirements as per standards, causes for deviation from the standards.

UNIT III SAFETY INTEGRITY LEVEL (SIL)

Evaluating Risk, Safety Integrity Levels, SIL Determination Method: As Low As Reasonably Practical (ALARP), Risk matrix, Risk Graph, Layers Of Protection Analysis (LOPA) – Issues related to system size and complexity –Issues related to field device safety – Functional Testing

UNIT IV SYSTEM EVALUATION

Failure Modes, Safe/Dangerous Failures, Detected/Undetected Failures, Metrics: Failure Rate, MTBF, and Life, Degree of Modeling Accuracy, Modeling Methods: Reliability Block Diagrams, Fault Trees, Markov Models – Consequence analysis: Characterization of potential events, dispersion, impacts, occupancy considerations, consequence analysis tools – Quantitative layer of protection analysis: multiple initiating events, estimating initiating event frequencies and IPL failure probabilities.

UNIT V CASE STUDY

SIS Design check list – Case Description: Furnace/Fired Heater Safety Shutdown System: Scope of Analysis, Define Target SILs, Develop Safety Requirement Specification (SRS), SIS Conceptual Design, Lifecycle Cost Analysis, verify that the Conceptual Design Meets the SIL, Detailed Design, Installation, Commissioning and Pre-startup Tests, Operation and Maintenance Procedures.

TOTAL : 45 PERIODS

SKILL DEVELOPMENT ACTIVITIES (Group Seminar/Mini Project/Assignment/Content Preparation / Quiz/ Surprise Test / Solving GATE questions/ etc)

1. Interpretation of various standards and safety regulations
2. Selection of Safety system for applications.
3. Familiarization of any one relevant software tool (MATLAB/ SCILAB/ LABVIEW/ Proteus/ Equivalent open source software)
4. Seminar on interpretation of safety system failure case studies
5. Realization of safety regulation in immediate environment
6. Introduction to other advanced safety system not covered in the above syllabus

COURSE OUTCOMES:

CO1 Analyse the role of safety instrumented system in the industry.
CO2 Define various hazards in industry environment.
CO3 Summarize the safety integrity level for an application.
CO4 Distinguish the safety environment in industry.
CO5 Analyse the failure modes, failure rates and MTBF using various reliability engineering tools.
CO6 Apply the design, installation and maintenance procedures for SIS applied to industrial processes.

TEXT BOOKS:

1. Paul Gruhn and Harry L. Cheddie,” Safety Instrumented systems: Design, Analysis and Justification”, ISA, 2nd edition, 2018.
2. Eric W. Scharpf, Heidi J. Hartmann, Harlod W. Thomas, “Practical SIL target selection: Risk analysis per the IEC 61511 safety Lifecycle”, exida2nd Edition 2022.

REFERENCES:

1 William M. Goble and Harry Cheddie, “Safety Instrumented Systems Verification: Practical Probabilistic Calculations” ISA, 2012.
2. Edward Marszal, Eric W. Scharpf, “Safety Integrity Level Selection: Systematic Methods Including Layer of Protection Analysis”, ISA, 2002.
3. Standard – ANSI/ISA-84.00.01-2004 Part 1 (IEC 61511-1 Mod) “Functional Safety: Safety Instrumented Systems for the Process Industry Sector – Part 1: Framework, Definitions, System, Hardware and Software Requirements”, ISA, 2004