Critical Evaluation of Hazards Operability Versus Safety Integrity Risk Analysis Techniques

Critical Evaluation of Hazards Operability Versus Safety Integrity Risk Analysis Techniques

Mohammed Malik (SABIC, Al-Jubail, Saudi Arabia)
Copyright: © 2018 |Pages: 9
DOI: 10.4018/IJRCM.2018010103
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Abstract

Many companies follow very systematic methodology for carrying out execution of Mega projects. Project risks are identified, analyzed and proposed mitigation actions are identified and agreed upon. This activity is carried out in Project Risk Workshop. While SIL and HAZOP workshops are broadly related to the process design. HAZOP technique is a highly disciplined and systematic in nature; it attempts to identify how a process may deviate from the design intent. The emphasis in the HAZOP study is on identifying potential problems, not necessarily solving them. SIL studies is a specialized area of Instrumentation and Control systems. The requirement for the safety instrumented system (SIS) is defined by SIL Levels. It identifies and analyzes layers of protection of major process upsets and emergencies. The SIL requirement tells how reliable a safety instrumented function needs to be. SIL determination and verification are part of inherent plant design for a chemical plant. This short article discusses these key concepts one by one and addresses their correlation with one another.
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Literature Review And Discussion

HAZOP – Hazards and Operability Study

HAZOP (Hazards and Operability Study) is a well-established method as a means of identifying potential plant design hazards and operability problems to help improve plant safety. The HAZOP technique is highly disciplined and systematic. It attempts to identify how a process (e.g. petrochemical, pharmaceutical or oil & Gas etc. process) may deviate from the design intent. The emphasis in the HAZOP study is on identifying potential problems, not necessarily solving them.

In a HAZOP study, a team of individuals systematically “brainstorms” the process under review in a series of meetings using a set of guide words to structure the review. The team consists of individuals representing a variety of Engineering disciplines / specialties. This multi-disciplinary team concept allows the various viewpoints of the team members to stimulate the thinking of the other team members and results in creative thinking. Consequently, a more thorough review is achieved than would occur if members of the team reviewed the same process individually.

A typical HAZOP study team, in addition to HAZOP leader and Scribe, may consist of the representatives from the following disciplines:

  • Inspection

  • Instrumentation/Control systems

  • EHSS

  • Maintenance

  • Operations

  • Process Engineering (Preferably one design process engineer and one independent process engineer)

  • Other Specialists as required

It is highly recommended to engage an independent HAZOP leader i.e. S(he) should neither belong to the owner not to the contractor side. This is a fundamental step towards having independent and un-biased study.

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