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Safety Instrumented Systems - SIS Course Preview

8 Chapters 37 Topics Intermediate

An eFunctionalSafety Online Course

Preview the first few lessons of the Safety Instrumented Systems Foundation online course - independently accredited by the Institution of Chemical Engineers - IChemE.


Course Outline

Course Outline and roadmap 1 Lesson

Course roadmap

View the course introduction and roadmap of all course sections.

Introduction to functional safety in the process industry 4 Lessons

Safety in context

This part of the course puts functional safety into context with other important safety measures.

History of electrical and control systems in safety applications

This lesson provides an outline of why standards needed to be developed as equipment changed from the 1960's onwards to cover more and more configurable devices with embedded and application level software.

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SIS safety life-cycle overview

This lesson provides an interactive outline of the SIS safety life-cycle from IEC 61511. The IEC 61511 standard is the process industry sector functional safety reference source.

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Key SIS Terminology, Regulations and Standards 4 Lessons

Key terminology

Key terms explained - hazard, hazardous event, severity of harm, frequency, consequence, risk, ALARP, risk reduction, SIL, BPCS, SIS, SIF.

Regulations and standards

The EU and USA regulations and best practices at a general level, plus an overview of the specific functional safety standards and their legal status.

IEC 61511 edition 2 introduction

Video overview of the updates to IEC61511 clauses.

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Functional safety management 6 Lessons

Functional safety management overview

This lesson outlines the planning, organisation and resources, procedures, checklists and tools needed to manage functional safety effectively.

Competence introduction

An introduction to competence requirements of IEC 61511 and competence management systems - now a mandatory requirement to get to grips with since edition 2 was re-published in 2016/17.

Roles in the safety life-cycle

There are some key individual roles in the SIS safety life-cycle, each with aspects that can affect safety integrity. This lesson explains some of the job functions that can impact functional safety, and provides tips for the safety life-cycle.

Verification and validation planning

A summary of the principal difference between verification and validation, and how planning should occur as part of functional safety management.

Functional safety assessment and audit

Functional safety involves many different aspects, so assessment is a requirement for capital projects, and after some time in operation. This module explains the stages mandated and recommended for FSA and audit.

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Hazard, risk and SIL assessment 6 Lessons

Process industry hazards

This lesson defines what a hazard is and outlines each of the main risk receptors considered in hazard studies; people, environment and finances.

Hazard analysis workflow and methods

Hazard studies can take many forms, but this module outlines how a typical workflow of hazard study, risk ranking and safety function allocation can take place in practice.

Introduction to probability and frequency for risk assessment and SIL

Background on the topic of probability and event frequency is useful for analysis techniques such as LoPA (Layer of Protection Analysis), Event Tree Analysis and Fault Tree Analysis.

Protection layer analysis and SIL determination

This lesson introduces qualitative and quantitative risk assessment options from IEC 61511, including risk graph and Layer of Protection Analysis.

Cybersecurity risk assessment

Learn the cyber-security risk assessment requirements of IEC 61511, and how this applies to Industrial Automation and Control Systems (IACS) in a modern process plant.

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SIS safety requirements specification 3 Lessons

SIS safety requirements specification

This lesson outlines the objectives and types of requirement for an SIS for hardware and software. Learn the qualities of well-written requirements and how they can be developed to be modular in nature.

SRS challenges

This is a short lesson explaining some of the challenges of writing good requirements and keeping them up to date.

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SIS design, engineering, installation, commissioning and validation 8 Lessons

SIS equipment selection

How should SIS equipment be selected - what are the criteria? This lesson explains the basic requirements.

Understanding equipment failure

Learn about the random failure of electromechanical hardware, including failure rate and modes of failure.

SIS hardware design

This lesson covers the subject of the hardware design of safety instrumented systems at a block diagram (non-detailed) level. Detailed design can only happen after the SIS and its constituent SIF can be shown to meet the safety integrity, availability and test philosophy required in the safety requirements specification.

SIS software introduction

This lesson introduces the software found at different levels in a typical process application SIS installation. 

Application programming example

A simple interactive example of some application program logic.

SIS application program IEC 61511 edition 2 update

Changes to edition 2 in the software section 12 of IEC 61511, including new general, design, implementation and verification requirements.

Installation, commissioning and validation

A short outline of the installation, commissioning and testing activities that should result in seeing an SIS fully validated before startup occurs.

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SIS operation and maintenance 5 Lessons

SIS operations

Assuming an SIS already in operation, what are the typical tasks, plans and procedures needed to sustain the integrity of an SIS for the long term?

Bypass and override

A SIF should only be bypassed or overridden under special conditions. This lesson discusses the definitions of bypass and override, and proposes a typical workflow for applying bypasses.

SIS inspection and proof testing

Maintenance planning, why proof testing is required and the background to different types of SIS equipment failure. The lesson interactively explains how proof test frequency can affect PFDavg in low demand mode, and outlines effective inspection and tests for different parts of an SIS.

SIS modification and decommissioning

The objectives and methods for careful management of change.