| HIRAC | Hazard Identification Risk Assessment and Control 
| Others |
| HIRAC | Hazard Identification Risk Assessment and Control Study
| Others |
| HIRAC | Hazard Identification Risk Assessment and Controls
| Others |
| HIRAC | Hazard Identification Risk Assessment Control
| Others |
| HIRAC | Heading Issue Rule Application Conclusion
| Others |
| HIRAC | Highly Instrumented Reactor for Atmospheric Chemistry
| Others |