2. Introduction
Purpose of QRA:
1. Identify and quantify hazards and risks
2. Determine individual risks (IR)
3. Recommend measures to minimize/eliminate
hazards/risks
4. Facilitate development of emergency response plans
3. Types of Hazard Zones Criteria
Fire (Thermal Radiation)
- 37.5kW/m2 heat radiation hazard zone (1)
- 4kW/m2 heat radiation hazard zone (2)
- 3% fatality / 500 Thermal Dose Unit (for a fire < 30secs)
Explosion (overpressure)
- 5psi, 1psi and 0.5psi
Toxicity Exposure
- 3% fatality
Note:
1) Heat load capable of causing damages to equipment
2) Unbearable pain to human being upon exposure
18. 5. Recommended Risk Mitigation
Provide adequate ventilation
Install suitable gas monitoring system
Update relevant operating procedures e.g. maintenance
and inspection
Update Emergency Response Plan (ERP)
Communicate updated procedures and ERP to
maintenance personnel