Case Study

ICSS Vulnerability Assessment


Following a period of poor production up-time associated with the installed Integration Control and Shutdown System (ICSS), a major UK oil and gas operator initiated a series of studies to identity the root cause and make improvement recommendations.

We were requested to complete a desktop vulnerability assessment covering the following areas:

  • Alarm system configuration and performance
  • Functional safety management
  • ICSS vulnerabilities

Our Scope

Review the Alarm Management Philosophy against industry standards for alarm management (EEMUA191 and IEC62682).

Review the ESD system design and the functional safety lifecycle activities to assess compliance with IEC -61511.

The functional safety review to include the following key areas:

  • SIL Assessment
  • SIL Verification
  • Safety Requirements Specification
  • Functional Safety Assessments.


Review of the Integrated Control and Safety System utilising key documents such as the functional design specification, architecture block diagram, and the E/E/PES change register to identify and assess vulnerabilities. 

The vulnerability assessment to including the following areas:

  • Operability & Maintainability
  • Maturity
  • Reliability & Availability


The ICSS vulnerability assessment was completed successfully.  A comprehensive report,  with serval key findings, was issued and presented to the client’s technical assurance and management teams.

Following acceptance of the findings, an improvement programme was developed ahead of project initiation.


Our consultants are subject matter experts covering all C&I engineering related sub-disciplines
Design & Engineering
Design and engineering of industrial automation systems, including upgrades and modifications, is our speciality
Systems Integration
Our engineers have knowledge and expertise in a range of systems and equipment, which allows us to act as both designer and system integrator
We have extensive Brownfield and Greenfield commissioning experience ranging from delivery of major capital projects through to minor modifications

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