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Safety Instrumented Systems (SIS)

Aon Energy Risk Engineering - Safety Instrumented Systems

Reduce Risk. Increase Reliability. Achieve Compliance.


In an environment where failure is not an option instrumentation designed to prevent hazardous events must be properly designed, installed and maintained. Safety instrumented systems (SIS) must reliably perform the safety instrumented functions for which they were designed. Safety instrumented systems must be designed and maintained to achieve the safety integrity level (SIL) required to lower risk to an acceptable level. Aon Energy Risk Engineering can provide the technical expertise to evaluate current safety instrumented systems to determine whether the safety integrity level is adequate to reduce risk to company acceptable limits.

Safety Instrumented Systems Program Services


Aon Energy Risk Engineering provides the following services:

  • Evaluation of risk and the risk reduction required through the use of layer of protection analysis (LOPA)
  • Evaluation of current safety instrumented systems
  • SIL calculations
  • Auditing of SIS programs
  • Defining recognized and generally accepted good engineering practices
  • Procedure development
  • Fault tree analysis

Implementing a Safety Instrumented Program


Implementation of a comprehensive SIS program will significantly reduce a company’s risk. Regulatory agencies require a SIS program be based on recognized and generally accepted good engineering practice (RAGAGEP) to safeguard employee safety. SIS programs can be developed for both large and small existing and new manufacturing facilities. Comprehensive programs can be developed and implemented for any industry handling hazardous chemicals including:

  • Refining
  • Chemical
  • Rubber
  • Plastics
  • Metals
  • Pharmaceutical
  • Utilities
  • Food

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