Process Hazard Analysis

The Structured What-If Technique (SWIFT) is a systematic hazard review method used to identify potential safety and operability concerns in systems and processes. During a SWIFT study, an experienced review team evaluates a system by asking structured “what-if” questions designed to explore deviations from intended operating conditions. These questions prompt discussion of possible causes, potential consequences, existing safeguards, and opportunities for improvement. SWIFT is commonly used to evaluate new designs, operational changes, or existing systems, helping organizations identify risks and implement practical measures to improve safety and reliability.

A Hazard Identification (HAZID) study is a high-level, structured review used to identify potential hazards associated with a system, facility, or operation early in the design or planning process. During a HAZID, a multidisciplinary team systematically reviews the system to identify credible hazards related to materials, processes, equipment, operating conditions, and the surrounding environment. The team evaluates potential consequences and identifies areas where additional analysis, safeguards, or design improvements may be required. By identifying hazards early, a HAZID study helps organizations prioritize risks, guide safer design decisions, and establish a strong foundation for more detailed hazard analyses later in the project lifecycle.

Fault Tree Analysis (FTA) is a systematic, deductive method used to evaluate the causes of system failures or hazardous events. The analysis begins with a defined undesired event and works backward to identify the combinations of component failures, human actions, or system conditions that could lead to that event.

Using a graphical logic diagram, faults are connected through logical relationships (such as AND and OR gates) to illustrate how multiple failures may interact within a system. FTA helps organizations understand failure pathways, evaluate system reliability, and identify design or operational improvements that can reduce the likelihood of critical events.

A Hazard and Operability (HAZOP) study is a structured, team-based hazard analysis method used to identify potential safety risks and operational issues within complex systems. During a HAZOP, a multidisciplinary team systematically evaluates process nodes using established guide words such as “no,” “more,” or “less” to examine potential deviations from the intended design or operating conditions. The team then identifies possible causes, evaluates potential consequences, and reviews existing safeguards. This collaborative process helps organizations better understand system behavior, identify vulnerabilities, and implement measures that reduce risk while improving operational reliability.

Layers of Protection Analysis (LOPA) is a structured risk assessment method used to evaluate whether existing safeguards provide sufficient protection against identified hazards. During a LOPA, analysts examine a specific hazardous scenario by identifying initiating events and evaluating the independent protection layers designed to prevent or mitigate the consequences. These protection layers may include engineered controls, safety systems, alarms, procedures, or other safeguards. LOPA helps organizations determine whether risk levels are acceptable or if additional protective measures are needed to reduce the likelihood or severity of hazardous events.

A Failure Mode and Effects Analysis (FMEA) is a structured, team-based method used to identify potential failure modes within a system, process, or design and evaluate their effects on overall performance. During an FMEA, a multidisciplinary team systematically reviews components or process steps to determine how they might fail, the causes of those failures, and their potential impacts. The team then assesses risk by considering factors such as severity, likelihood, and detectability, and prioritizes actions to reduce or eliminate high-risk issues.