AS4343 pressure vessel classification framework for Western Australia determines hazard levels by calculating design pressure multiplied by volume, routing vessels into five categories from Level A (highest risk) to Level E (lowest risk). Each hazard level specifies distinct WA compliance requirements including design registration, item registration, inspector qualifications, and mandatory inspection intervals ranging from 12 to 60 months. The classification system accounts for public risk exposure, fluid hazard groups, and industrial application context to ensure appropriate regulatory oversight. Fork this diagram on Diagrams.so to customize compliance workflows, integrate with your design documentation, or adapt for other Australian jurisdictions. Hazardous fluids (Group 1) may escalate classification by one level regardless of P×V calculation.