What is Preliminary Hazard Analysis (PHA) ?

PHA is a comparative method. Comparative techniques are based on hazard identification (HAZID) by comparing with standards. The various methods are checklist, safety audit, hazard indices and preliminary hazard analysis.

Purpose

For early identification of hazards.

Applicability

In preliminary design phase to provide guidance for final design.

Data required

Plant design criteria, hazardous materials involved and major plant equipment.

Results

List of hazards (as per available design details) with recommendation to designers to support hazard reduction

https://safety.ohse.in/2020/12/how-to-do-preliminary-process-hazard.html