Process Hazard Analysis (PHA) is a structured and systematic approach for identifying, evaluating, and controlling the potential hazards associated with the processing or handling of highly hazardous chemicals. The PHA methodology selected must be appropriate to the complexity of the process and assist companies in making decisions for improving safety and identify, evaluate, and control the hazards involved in the process.

The PHA shall address the following

♣ Identify the extent of the process hazards

♣ Cause and consequences of fires, explosions, releases of toxic or flammable chemicals and major spills of hazardous chemicals

♣ Any previous incident that potentially can lead to catastrophic consequences

♣ Engineering and administrative controls and failure consequences

♣ Stationary source siting

♣ Human factors/actions (routine and non-routine) and

♣ Equipment, instrumentation, utilities and any external factors

A Process Hazard Analysis (PHA) team can vary in size from two people to a number of people with varied operational, engineering and technical background which 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. The team leader needs to be fully knowledgeable in the implementation of PHA methodology to be used and should be impartial in the evaluation. At least one team member must be familiar with the process being evaluated.

Companies must also ensure that at least every five years after the completion of the initial process hazard analysis, the PHA must be updated and revalidated to ensure the hazard analysis is consistent with the current process.

PHA Services Offered

♣ Hazard and Operability Study (HAZOP)

♣ Hazard Identification Study (HAZID)

♣ Bow-Tie Analysis

♣ Quantitative Risk Assessment (QRA)

♣ Layer of Protection Analysis (LOPA)

♣ Safety Integrity Level (SIL) Classification

♣ ALARP Workshops

To find out more on how ISRC may support you, please enquire on Tel : +65 6747 4123 or Email to :