Process Hazard Analysis (PHA) is a thorough, orderly, and systematic approach for identifying, evaluating, and controlling the hazards of processes.

The process hazard analysis methodology selected must be appropriate to the complexity of the process and must identify, evaluate, and control the hazards involved in the process.

The process hazard analysis shall address the following:

  • The hazards of the process
  • The identification of any previous incident that had a likely potential for catastrophic consequences
  • Engineering and administrative controls applicable to the hazards and their interrelationships
  • Consequences of failure of engineering and administrative controls
  • Stationary source siting
  • Human factors and
  • A qualitative evaluation of a range of the possible safety and health effects of failure of controls.


A Process Hazard Analysis (PHA) team includes process safety specialist, engineers, operators, supervisors and other workers who have knowledge of the standards, codes, specifications and regulations which apply to the process being studied.


PHA Services Offered by Circles Safety:

  • Hazard and Operability Study (HAZOP)
  • Hazard Identification Study (HAZID)
  • Bow-Tie Analysis
  • What-If Analysis
  • Quantitative Risk Assessment (QRA).


Hazard & Operability Study (HAZOP)

HAZOP study is to carefully review a process or operation in a systematic manner to determine whether deviations from the design or operational intent can lead to undesirable consequences. This technique can be used for continuous or batch processes and can be adopted to evaluate written procedures. The HAZOP team lists pote......Read more >>

Quantitative Risk Assessments (QRA)

Risk Analysis techniques provide advanced quantitative means to supplement other hazard identification, analysis, assessment, control and management methods to identify the potential for such incidents and to evaluate control strategies. QRA is widely used in assessing the risk in Oil & Gas Installations especially refine......Read more >>

Hazard Identification Studies (HAZID)

HAZID (Hazard Identification) is a qualitative technique for the early identification of potential hazards and threats effecting people, the environment, assets or reputation. The major benefit of a HAZID study is to provide essential input to project development decisions.It is a means of identifying and describing HSE haz......Read more >>

Bow-Tie Analysis

Bow tie analysis is a hazard analysis technique which is combination of fault tree analysis (FTA) and event tree analysis (ETA). Fault tree analysis (FTA) is identifying basic events that can lead to an accident event, where as Event tree analysis (ETA) is identifying the event sequences from initiating events to accident sc......Read more >>

What-If Analysis

The purpose of a What-If Analysis is to identify hazards, hazardous situations, or specific event sequences that could produce undesirable consequences. An experienced group of people identifies possible abnormal situations, their consequences, and existing safeguards, and then suggests alternatives for risk reduction wher......Read more >>

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