What should a Process Hazard Analysis methodology be based on?
The complexity of the process and associated hazards
A Process Hazard Analysis (PHA) is a structured, systematic study used to identify, evaluate and control the hazards of an industrial process.
The core principle is that the rigour of the study must be matched to the actual risk it is meant to uncover.
That actual risk is set by two things: how complicated the process is and how severe the hazards associated with it are.
So a highly complex or high-hazard process demands a more thorough PHA technique, while a simple, low-hazard process can be reviewed with a lighter method.
The production schedule and operating time are output targets, not risk measures, so basing the method on them would miss hazards.
Workforce size does not define the chemistry or energy of the process, and a random selection of hazards is by definition unsystematic and would leave real risks unexamined.
Hence, the answer is The complexity of the process and associated hazards.
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