Online Course: Design of SIFs and SIL calculation


Update of the course with SILcet 5.0 Pro Plus is already available.

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(*) A 6 month license of SILcet is included to make the exercises of the course.

More information about Basic Functional Safety Course.



Standard Training

curso online seguridad funcional

Course 2 (7 modules)_v2

295 €

Duration: 24 hours.

Modules: 1 to 7

SILcet 5.0 Pro Plus

Evaluation Tests

Training Certificate


Premium Training

curso online seguridad funcional

Course 2 (7 modules)_v2

from 1100 €

Duration: 24 hours.

Modules: 1 to 7

SILcet 5.0 Pro Plus

Evaluation Tests

Training Certificate

Contact us

Module 1

-Concepts about SIS, SIF, SIL and the life cycle. International Standards Relationship between IEC-61508 and IEC-61511.

-Risk concepts and how to reduce them with the different layers of protection. Requirements and examples of the IPL.

-Interpretation of the principle of independence of the SIS according to IEC Standards. Examples

-Basic concepts about Process Hazards Analysis techniques. Qualitative method exercise for the determination of SIL.

Module 2

-Detailed analysis of the SIF. Sensor, logic solver and actuator subsystems.

-Types of failures, practical examples in the 3 subsystems and their impact (safe, dangerous, detected & not detected, common cause, etc.)

-Types of diagnostics (product and application) and real examples in the three subsystems (PVST, 4-20 mA signals, short circuit, line monitoring, use of the Hart, etc.)

-PLC: “fail-safe” versus standard.

-Most used architectures and examples.

-Principles of design of safe systems. “Fail Close” and “Fail Open” valve cases.

Module 3

-Requirements of IEC 61508/61511 Standards to design the SIF and calculate the SIL. Examples.

-The 9 key parameters in detail to calculate PFDavg and MTTFS.

-The sources of data.

-How to calculate the beta factor.

-Equations to calculate PFDavg and MTTFS.

-How to improve SIL / RRF.

-Simple example

Module 4

-Safety Requirements Specification (SRS). Assumptions for the examples (configuration Low/High of the transmitter according to the architecture, online / offline tests, etc.).

-Practical exercises using the SILcet tool:

  1. Tank Level (several cases)
  2. Vessel under pressure (several cases): i) undefined sensor type, ii) transmitter vs switch, iii) diversity of elements, iv) credit by comparison, v) bypass impact.
  3. Calculate the SIL achieved by the Logic Solver.

-21 general considerations to design the SIS.

-Excel files included: “SILcet with the exercises solved” & Example of Safety Requirements Specification (SRS).

Module 5

-Safety Requirements Specification (SRS). Assumptions for the examples.

-Real practical exercises using the SILcet tool:

  1. Low combustion air flow in Incinerator or Furnace.
  2. Stop of high pressure pumps by partial closure of the suction.
  3. Gas valve closure due to flame loss.
  4. Emergency depressurization in a reactor: action on several lines when the temperature is excessive (Reactor Bed Temperature).
  5. How to solve a SIF with two Logic Solvers (Safety PLCs).
  6. SIF with shared elements (Control System and SIS).
  7. Example with Partial Valve Stroke Test.
  8. Examples with Complex Architectures.

– Excel file included: “SILcet with the exercises solved”.

Module 6

-How to prepare a SIL Verification Report.

-Main document with MS-Word Template.

-Annex of parameters, graphs and results (PFDavg, PFH, MTTFS) generated by SILcet.

-Example of report with the exSILentia tool.

Module 7

Note: Other additional exercises that are delivered resolved to the participants at the end of the course.

-Safety Requirements Specification (SRS). Assumptions for the exercises.

-Real practical exercises using the SILcet tool (in each case there are several possible configurations):

  • Turbine Trip Valve Hydraulic System.
  • High Integrity Pressure Protection System
  • Pressure vessels (different cases).
  • Others: Solutions with high availability, Fire & Gas System, Protection of a Silo.

– Excel file included: “SILcet with the exercises solved”.

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.

Why is it a different course?

  • Because we use a SIL calculation and verification tool developed by us (“SILcet“) that allows us to make a lot of real examples. This is impossible to perform in most functional safety courses due to the complexity of calculations when dealing with real cases.
  • We provide a free license (Pro Plus) of SILcet with many of the examples of the course.

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.

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.


  • Self-directed course in English.
  • Duration (full course of 7 modules): between 16 and 30 hours in 60 days depending on student level (available 24/7).
  • Methodology “learn by doing”
  • Individual Progress. No scheduled sessions


  • PDF documents, including the practical cases.
  • Excel files (SILcet) with real calculations.
  • SILcet 5 Pro Plus license included (license for 6 months)
  • 30% discount in license renewal.
  • SILcet Manual and detailed document with formulas to calculate PFDavg and MTTFS.
  • Videos with explanations.
  • Instructor Support
  • Exercises, evaluation tests and training certificate.
  • Virtual Campus: Schoology

The student can download all the documentation and tools on his/her PC, except the videos.

How to start the course?

  1. Send us an email to informing us that you have made the purchase.
  2. We will send you the instructions to start the course with the access code to SCHOOLOGY.
  3. Start your training!

Jose Bielza

Position: Trainer
Master in Industrial Engineering with specialization in Electronics and Automation from the Polytechnic University of Madrid. More than 30 years of experience in the area of Instrumentation and Control in several multinational companies. Expert on Functional Safety.
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