Course: Design of SIFs and SIL calculation

curso online seguridad funcional


Course 2 (8 modules).

312 €

Duration: 21 hours.

Modules: 1 to 8

SILcet 4.1 Pro

Training Certificate

Coupon -20% this month: SP3412


curso online seguridad funcional


Course 1 (5 modules).

208 €

Duration: 10 hours.

Modules: 1 to 5

SILcet 4.1 Pro

Training Certificate

Coupon -20% this month: SP3412


SILcet tool license

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



It is possible to perform an upgrade from Course 1 to Course 2 during four months after purchasing.

Contact us for more information.

Download Options for online training


Module 1

  • 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

  • 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”.

Module 3

  • 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.

Module 4

-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 (SILcet Excel files included).

  • 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.

Module 5

  • How to make a SIL Verification Report. Example with Word Template and SILcet Tool.
  • Word Template, SILcet Excel file and 3 Annexes included.

Module 7

  • 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

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

Module 6

-Design considerations of actuator subsystem.

-Resolution of real practical examples step by step (SILcet Excel files included)

  • 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.

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 1) 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 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


  • PDF documents (more than 350 slides), including the practical cases.
  • Excel files (SILcet) with real calculations.
  • SILcet 4 Pro license included (license for 6 months) (on full courses)
  • 30% discount in license renewal.
  • 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

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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