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Design & Operation of a Safety Instrumented System (SIS)

3 days SEC/SIS-E
  • Engineers and technical staff involved in design, operation and maintenance of SIS.
  • Ensure that design, operation and maintenance of a SIS will meet the expected risk reduction.
Learning Objectives
  • Specify the attended risk reduction factor.
  • Understand Safety Integrity Level (SIL) concept.
  • Use IEC 61511 methodology for design and operation.
Ways and means
  • Step by step case study.

SIS and industrial risk management 0.75 day
  • Identification of required Safety Instrumented Function (SIF) with Safety Reviews (LOPA & HAZOP).
  • Concept of Independent Protection Layer (IPL).
  • Determination of required Safety Integrity Level (SIL) using a Risk Matrix.
SIS design 1.5 days
  • Functional Specification: SIF allocation, cause/effect matrix, functional analysis, redundancies and fault tolerance requirements according to SIL.
  • System Specification: Safety Programmble Logic Controller (S-PLC), Humane Machine Interface (HMI).
  • Software specification: voting, maintenance bypasses and sensor signal analysis. Actuators discrepancy management.
  • Hardware specification: recommended technologies for sensors and actuators.
  • SIS Validation: required documents; Factory and Site Acceptance Tests (FAT - SAT).
SIS operation 0.75 day
  • Management of bypasses and changes.
  • Definition, implementation and optimization of inspection and test program.
  • Step by step application of IEC methodology to a small process unit:
  • risk and IPL analysis
  • SIS specification
  • test definition including periodicity
  • test procedure validation.