Key takeaways:
The article describes the HAZOP method and how to conduct it in accordance with EN 61882:2016-07E, with an emphasis on identifying deviations, risks, and corrective actions. It also presents an example application (a conveyor belt) and the context of compliance with 2006/42/EC and CE.
- HAZOP (Hazard and Operability Study) is a systematic method for identifying hazards and operational issues in industrial systems.
- The purpose of HAZOP is to understand how and why a system may deviate from its intended operation and what the consequences of those deviations are.
- EN 61882:2016-07 describes the principles for conducting HAZOP, including dividing the system into parts and defining the design intent.
- The analysis uses guide words (e.g., “No,” “More,” “Less”) to generate deviations and assess causes, effects, and corrective actions.
- HAZOP can support compliance with the requirements of the Machinery Directive 2006/42/EC and preparation for CE certification, although it is not explicitly required.
In today’s fast-evolving world of industrial automation, ensuring operational safety and identifying potential hazards have become top priorities for companies. One of the most effective methods for analyzing system risk and operability is HAZOP (Hazard and Operability Study). It is a systematic tool used to identify hazards and potential operational issues in industrial automation projects, as well as in machine and production line design. In this article, we take a closer look at the HAZOP method, its importance across different fields, and the role it plays in ensuring compliance with standards and directives, such as the Machinery Directive 2006/42/EC and CE certification.
What is HAZOP?
HAZOP stands for “Hazard and Operability Study.” It is a structured and systematic technique used to examine systems in order to identify potential hazards and operational problems. The main purpose of HAZOP is to understand how and why a system may deviate from its intended operation and what the consequences of those deviations may be.
EN 61882:2016-07 and HAZOP
Scope of the Standard
EN 61882:2016-07 is a European standard that sets out the principles for conducting Hazard and Operability Studies. It describes in detail the procedures to be followed when analyzing system risk and operability. The standard defines HAZOP requirements in the context of hazard identification and risk assessment at different stages of a system’s life cycle.
Key Elements of the Standard
- Dividing the System into Parts:
- The system should be divided into smaller parts that can be analyzed in detail. The size of these parts depends on the complexity of the system and the potential consequences of the risk. In simple systems, the parts may be larger, while in complex systems they should be smaller to allow for a more detailed analysis.
- Design Properties:
- Design intent is expressed in terms of properties that describe the essential characteristics of parts of the system. These properties may include inputs and outputs, functions, activities, and sources and destinations. For example, in a chemical system, the properties may include temperature, pressure, and chemical composition.
- Guide Words:
- The Hazard and Operability Study uses a set of guide words to identify potential deviations from the design intent. Examples of guide words include: “No,” “More,” “Less,” “Part of,” “Reverse,” “Other than,” “Earlier,” “Later,” “Before,” “After.” These words help the team systematically review all aspects of the system.
- Application Examples:
- The standard includes a range of examples of HAZOP applications in different contexts, including process systems, transport systems, programmable systems, and administrative procedures. These examples show how HAZOP analysis can be used to identify hazards and operational problems across different industries.
Process for Conducting a HAZOP Analysis in Accordance with the Standard
- Study Initiation:
- A HAZOP study begins with the appointment of a study leader and a team of specialists from different disciplines, such as engineering, safety, operations, and management. The study leader is responsible for coordinating the entire process and ensuring that all stages are carried out in accordance with the standard.
- Defining the Scope and Objectives:
- Working with the team, the study leader defines the scope of the analysis and its objectives. This includes identifying all system elements to be analyzed and setting the criteria against which potential hazards will be assessed. The scope of the study should take into account the system boundaries and its interfaces with other systems and the external environment.
- Preparation:
- The team gathers all necessary system data and documentation, including diagrams, functional descriptions, operating procedures, and operating instructions. Based on this information, detailed descriptions of the design intent are prepared. The study leader ensures that all information is complete and accurate, which is critical to the effectiveness of the analysis.
- Conducting the Analysis:
- The Hazard and Operability Study is carried out using a set of guide words to identify potential deviations from the design intent. Each deviation is analyzed in terms of its causes, consequences, and possible corrective actions. The study team systematically works through all parts of the system, applying the guide words to each identified deviation.
- Documentation and Follow-Up Actions:
- The results of the analysis are documented in detail, and the study leader ensures that all identified hazards are properly managed. Based on the analysis results, corrective actions are taken to eliminate or minimize risk. The documentation should include detailed descriptions of the identified hazards, causes, consequences, and recommended corrective actions.
1. Conveyor transporting parts
| System element | Design intent | Guide word | Deviation | Causes | Consequences | Recommendations |
|---|---|---|---|---|---|---|
| Conveyor | Transport parts from point A to point B | No | No conveyor movement | Drive failure, blockage caused by an object | Production stoppage, delays | Regular drive maintenance, blockage sensors |
| Conveyor | Transport parts from point A to point B | More | Excessive speed | Controller failure, incorrect speed settings | Part damage, accident risk | Speed control, controller calibration |
HAZOP in the Context of CE Certification and the Machinery Directive 2006/42/EC
Machinery Directive 2006/42/EC
The Machinery Directive 2006/42/EC sets out safety and health protection requirements for the design and construction of machinery. Although the directive itself does not require a HAZOP analysis, carrying one out can make a significant contribution to meeting its requirements. HAZOP enables manufacturers to identify and assess potential hazards at the design stage, making it possible to implement the necessary preventive and corrective measures before the machine is put into use.
HAZOP helps identify weak points and potential operational issues that may not be immediately apparent during traditional risk assessment procedures. This makes it possible to improve machine reliability and safety, which in turn supports better compliance with the Machinery Directive and minimizes the risk of failures and accidents. In the broader regulatory context, it is also worth following the changes introduced by the Regulation on Machinery 2023/1230/EU.
CE Certification
CE certification is a marking that confirms a product complies with all relevant European Union directives and standards. Although a Hazard and Operability Study is not required to obtain CE certification, carrying it out can significantly support the process.
Conducting a HAZOP analysis makes it possible to detect potential hazards and issues at the design and production stages. As a result, manufacturers can implement appropriate corrective measures that improve machine safety and reliability. HAZOP also helps prepare complete technical documentation, which is essential for obtaining CE certification of machinery.
It is worth emphasizing that CE certification is not only about meeting legal requirements, but also a mark of quality and safety that increases customer confidence in products. By carrying out a HAZOP analysis, manufacturers can prepare more effectively for the certification process, minimizing the risk of problems at later stages and ensuring that their products are safe and reliable.
Examples of HAZOP Applications
Chemical Industry
In the chemical industry, HAZOP is used to assess the safety of production processes, where identifying potential hazards such as chemical leaks or explosions is critical to ensuring the safety of workers and the environment. A Hazard and Operability Study makes it possible to thoroughly analyze every stage of the production process and identify potential failure points.
Food Industry
In the food industry, HAZOP helps identify hazards related to food quality and safety. The analysis covers every stage of production, from raw materials to the finished product, helping ensure compliance with food safety standards and requirements. In high-volume production environments such as the FMCG industry, HAZOP makes it possible to identify potential hazards such as cross-contamination and to plan appropriate preventive measures.
Power Industry
In the power sector, Hazard and Operability Study is used to assess the risks associated with operating power installations such as power plants or transmission networks. The analysis makes it possible to identify potential hazards such as equipment failures or operator errors and to plan appropriate preventive measures. HAZOP helps ensure continuity of operation and minimize the risk of major failures, which is also important in other demanding sectors such as heavy industry.
The Role of Engineering Outsourcing in the Process
Today, many companies choose engineering outsourcing to carry out Hazard and Operability Study analyses. External specialists bring extensive experience and expertise, enabling a more thorough and objective risk assessment. Engineering outsourcing can be particularly beneficial when a company does not have sufficient resources or competencies to perform the analysis in-house.
HAZOP is an invaluable tool in industrial automation, enabling the systematic identification of hazards and operational issues. By applying HAZOP analysis, companies can ensure compliance with standards and directives, such as the Machinery Directive 2006/42/EC, and obtain CE certification. Carrying out a HAZOP analysis requires the involvement of experienced specialists and thorough documentation, helping to minimize risk and ensure operational safety. Working with external engineers through outsourcing can further improve the efficiency and accuracy of the analyses performed.
Industrial automation, machine design, CE certification, machine safety, and many other areas benefit from the HAZOP method, making it a key part of modern safety and quality standards in industry. HAZOP makes it possible not only to ensure compliance with legal requirements, but also to improve the efficiency and reliability of industrial systems. It is equally valuable in sectors such as the automotive industry, the pharmaceutical industry, and the electronics and semiconductor industry, where process stability and safety are essential.
HAZOP: The Key to Safety and Efficiency
HAZOP (Hazard and Operability Study) is a structured and systematic technique for examining systems to identify potential hazards and operability issues. It helps determine how and why a system may deviate from its intended operation and what the consequences may be.
The rules for conducting HAZOP studies are set out in EN 61882:2016-07. It describes the procedures and requirements for hazard identification and risk assessment at various stages of the system life cycle.
HAZOP uses guide words to systematically identify deviations from the design intent. Examples include “No”, “More”, “Less”, “Reverse”, and “Other than”.
The process includes initiation (appointing the leader and team), defining the scope and objectives, and preparing the documentation. The team then analyzes the deviations, and the results are documented together with corrective and follow-up actions.
Directive 2006/42/EC does not explicitly require a HAZOP study. However, a HAZOP analysis can significantly support compliance with the directive and the CE certification process by identifying hazards and design weaknesses at an early stage.