Description
The preliminary hazard analysis (PHA) is a semi-quantitative risk analysis methods that is used to identify potential hazards and the corresponding top events (risks). The PHA sheet identifies as well the required measures and follow-up actions to control the hazard sources. The PHA should consider hazardous components, facilities, safety-related equipment, and environmental constraints.
Effort
Low
Complexity
Medium
Method Type
Semi-Quantitative
ISO 31000
Risk Identification
Risk Analysis - Causes/Threats
Risk Analysis - Consequences
Risk Analysis - Likelihood
Risk Analysis - Severity
Prerequisites
Basic Approach
- Determining the hazard sources and the corresponding risks.
- Extracting all possible causes that could contribute to the top event.
- Extracting all possible consequences that could result from the occurrence of the top event.
- Determining the probability of occurrence and severity of the corresponding risk.
- Determining the required measures for the mitigation and prevention of risks.
Advantages
- Simple method to apply
- Overall idea of the possible hazard sources and risks in one picture
Disadvantages
- It may over-simplify complex situations, particularly where quantification is required
Copyright © 2022 TUHH. All rights reserved.