course content (online) - functional safety · -concepts about sis,sif, sil and the life...

Enertria / ETC-FunSafe: Content of Online Course – Design of SIFs and SIL Calculation of 8

https://www.safetyandsis.com - [email protected]

Design of SIFs and SIL Calculation

Design of Safety Instrumented Functions and verification of SIL and MTTFS based on practical examples of safety functions in the process industry. Comparison of different designs and generation of reports. Alternatives to modernize an existing SIS.

Who is it for?

Students, technicians, designers, system integrators and engineers related to Functional Safety and Safety Instrumented Systems (SIS) of the process industry.

It is advisable to have certain knowledge of instrumentation and control.

Course Objective

The objective is to acquire knowledge to understand and design Safety Instrumented Functions (SIF) from a totally practical point of view. To do this, real examples are made with the SILcet tool that allows different design alternatives to be compared.

What to expect from the Course? Understand what a SIF is and what concepts and parameters are the most influencing its design.

Learn how to design a SIF and calculate the SIL and MTTFS of real Safety Functions in the process industry.

Benefit from Lessons Learned and Best Practices acquired from Major Projects.

Methodology (online course) Self-directed course in English.

Duration (full course of 8 modules): between 21 and 40 hours in 60 days depending on student level (available 24/7).

Methodology "learn by doing"

Individual Progress. No scheduled sessions

Documentation and Tools PDF documents (more than 350 slides), including the practical cases.

Excel files (SILcet) with real calculations.

SILcet 4 Pro license included (6 months) (*)

SILcet Manual and detailed document with formulas to calculate PFDavg and MTTFS.

More than 40 videos with explanations.

Instructor Support.

Exercises, evaluation tests and training certificate.

Virtual Campus: Schoology.

COURSE CONTENT (online)

https://www.safetyandsis.com/



Contents Module 1 (35 slides & 3 videos)

-Concepts about SIS, SIF, SIL and the life cycle.

-International standards IEC-61508/61511

-Tolerable risks and layers of protection. Examples.

-Principle of independence. Reasons and examples.

-Example of qualitative method for determining the SIL.

Module 2 (56 slides & 4 videos)

-Detailed analysis of the SIF. Subsystems sensor, logic solver and actuator.

-Types of failures, their impact and examples found in the three subsystems (safe, dangerous, detected & undetected, common cause failures, etc.)

-Types of diagnostics and examples of application diagnostics in the three subsystems (PVST, analog signals, short-circuit, line monitoring, use of Hart, etc.)

-Safety PLC versus Standard PLC.

-Principles of design, most used architectures and examples (1oo2, 2oo2, 2oo3, 1oo3, 2oo4). Valve cases "Fail Close" and "Fail Open".


-The three SIL requirements of the Standards IEC 61508/61511. Examples.

-The 9 key parameters to calculate PFD and MTTFS. The 6 data sources of failure rates.

-Example about how to calculate the common cause beta factor.

-Formulas to calculate PFDavg and MTTFS.

-Simple example to calculate PFDavg.

-Summary about how to decrease PFDavg.


-Brief reminder of basic concepts of module 3.

-Introduction to SILcet tool. Detailed description and explanations of some examples with comparison of different design alternatives. How to increase SIL depending on architectures and subsystems. Resolution of real practical examples step by step.

• Tank Level (4 cases).

• Pressure Vessel: SIFs with diversity of components, solutions for high availability, etc.

• Benefits when comparing analog signals.

• Basics to calculate PFDavg in a PLC.

-21 general design considerations to design a Safety Instrumented Function.

-Two SILcet Excel files included: File without solved exercises and file with solved exercises (*)

Module 5 (6 slides & 3 videos) -How to make a SIL Verification Report. Example with Word Template and SILcet Tool.

-Word Template, Excel file and 3 Annexes included.

Module 6 (114 slides & 10 videos) -Resolution of real practical examples step by step.

• SIF with independent IPC and bypass.

• Methods to calculate PFDavg of Logic Solver.

• Heat Recovery Steam Generator with post-combustion.

• Turbine Trip Valve Hydraulic System.

• High Integrity Pressure Protection System.

• Pressure vessels (several cases).

• Other cases: High availability SIFs, Fire & Gas System, Silo Protection, etc.

-Design considerations of actuator subsystem.



-Analysis of 4 cases (old SIS found in the process industry).




-Solutions to upgrade the SIS comparing cost, technical design and fulfillment of IEC-61511.


Module 8 (22 slides) -Final practical exercise: Micro-Project of SIFs design and SIL verification (case statement based on a 2 burner boiler).

-Report in Word, SILcet Excel file and Annexes included.

(*) To use all features of SILcet an activation key is needed which is provided with the license of use.

Note: Students can download all documentation except videos.

The course includes the following tools in Excel for free:

SILcet 4 Pro: SIL calculation Excel tool (6 months license).

(Windows 7/8/10, Excel 2010/13/16/365)

Beta factor for the calculation of beta factors according to the methodology recommended by IEC-61508.

Cpt Calculator for making an estimation of the Proof Test Coverage of the actuator subsystem.

Heat dissipation: Calculation of the heat dissipation in the PLC cabinet and calculation of the required ventilation.

We show below some graphs and images used in the modules of the course:


course content (online) - functional safety · -concepts about sis,sif, sil and the life...

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