Process Safety: Major Accident Prevention Starts Here
In this article:
Major accidents are rare, but when they occur the consequences can be catastrophic. Despite significant advances in engineering and technology, incidents involving fires, explosions and toxic releases continue to occur across hazardous industries.
Organisations managing hazardous substances or safety-critical operations face the challenge of identifying hazards, controlling risks and maintaining the safeguards that prevent such events from occurring. This is the role of process safety.
Effective process safety is not a single study, procedure or management system. Process safety provides a structured framework for identifying hazards, managing risk and maintaining the barriers that prevent major accidents. By applying process safety principles throughout the asset lifecycle, organisations can improve operational resilience and reduce major accident risk.
This article explains the key principles of process safety and how they can be applied in practice to support safer and more resilient operations.
Key Takeaways
Process safety focuses on preventing major accidents such as fires, explosions and hazardous releases.
Effective process safety combines hazard identification, risk assessment and barrier management.
Process safety should be applied throughout the asset lifecycle, from concept development to decommissioning.
Management of Change and continuous improvement are critical to maintaining risk control.
Strong process safety supports both regulatory compliance and operational resilience.
Five Principles for Managing Major Accident Risk
Effective process safety frameworks share several common characteristics. While organisations may organise their systems differently, the following principles form the foundation of most successful process safety frameworks.
Figure 1: The five principles of process safety management.
Hazard Identification and Evaluation
Understanding process safety hazards, operating conditions, potential release scenarios and their consequences is fundamental to preventing major accidents. Structured techniques such as HAZID, HAZOP, consequence modelling, Layer of Protection Analysis (LOPA) and Quantitative Risk Assessment (QRA) are commonly used to identify, evaluate and manage process safety risks.
Inherently Safer Design
Opportunities to eliminate hazards or reduce risk are generally greatest during the early design stages, particularly through inherently safer design and sound process safety decision-making.
Barrier Management for Process Safety
No single safeguard can eliminate all risk. Process safety relies on multiple layers of protection, including relief systems, safety instrumented functions, emergency shutdown systems, fire and gas detection, operating procedures and competent personnel. Effective barrier management ensures these safeguards remain available and capable of performing their intended function.
A common challenge in process safety is that risks are identified during project phases but are not always actively managed during operations. Maintaining effective barriers throughout the asset lifecycle is therefore a key element of successful process safety management.
Management of Change (MoC)
Changes to equipment, procedures, software, operating conditions, or organisation can introduce new hazards. A robust MoC process ensures risks are identified, assessed and controlled before changes are implemented.
Learning and Continuous Improvement
Organisations must continuously learn from incidents, near misses, audits, inspections and operational experience. Effective process safety management includes monitoring performance, identifying weaknesses, implementing corrective actions and sharing lessons learned. This strengthens safety barriers and helps prevent recurrence of major accident hazards.
Barriers: How Prevention and Mitigation Measures Work Together
Process safety is fundamentally about preventing hazardous events and mitigating their consequences if prevention measures fail.
Figure 2: Bow-tie model – prevention barriers stop the top event; mitigation barriers limit the consequences.
This requires organisations to understand:
What could go wrong?
How likely is it to occur?
What prevention and mitigation barriers exist?
Are the barriers effective and reliable?
What happens if barriers fail?
Process safety risk assessments provide a structured basis for answering these questions and identifying measures needed to eliminate hazards where practicable and reduce the remaining risks to ALARP[IB1] . This means that safety risks must be reduced as far as possible until the cost, time and effort of further reduction become grossly disproportionate to the safety benefit gained.
Process Safety Across the Asset Lifecycle
Many major accident risks are influenced by decisions made long before an asset enters operation. Design choices, equipment selection, operational procedures, maintenance philosophies and organisational changes can all affect barrier effectiveness.
For this reason, process safety should be integrated throughout the asset lifecycle, from concept selection and engineering through commissioning, operation, modification and decommissioning. The figure below shows different studies and activities that are relevant for different lifecycle phases.
Figure 3 - different studies and activities that are relevant for different lifecycle phases
Building a Strong Process Safety Culture
Engineering safeguards alone are insufficient without competent people, effective management systems, operational discipline and strong leadership. A strong process safety culture helps organisations:
Maintain strong hazard awareness;
Encourage concerns to be raised openly;
Promote continuous learning;
Ensure safety-critical barriers are understood, maintained and respected;
Require active leadership participation in process safety.
Conclusion
Process safety is fundamental to preventing major accidents. It integrates sound engineering, effective risk management, reliable safety-critical barriers, operational discipline, management of change and continuous learning. By embedding these principles throughout the asset lifecycle, organisations can reduce major accident risk, improve operational resilience and support regulatory compliance.
Would you like to assess the effectiveness of your process safety programme?
ORS Consulting supports organisations with process safety services including HAZID and HAZOP studies, Safety Integrity Level (SIL) assessments, LOPA, QRA, consequence modelling, barrier management, Control of Major Accident Hazards (SEVESO/COMAH) support, process safety reviews and technical safety strategies.
Whether you are developing a new asset, modifying an existing asset, or seeking assurance that your safety-critical barriers remain effective, ORS Consulting can provide independent technical expertise to help reduce major accident risk and improve operational resilience.
Contact ORS Consulting to discuss how we can help strengthen your process safety performance and reduce major accident risk.
