IEC 61882:2016

Overview

IEC 61882:2016 - Hazard and operability studies (HAZOP studies) – Application guide is the IEC guidance standard for conducting structured, guide‑word driven HAZOPs. The second edition (2016) updates terminology to align with ISO 31000:2009 and ISO Guide 73:2009, and adds an improved case study for procedural HAZOPs. The standard explains the HAZOP technique and the full study procedure, from initiation and preparation through examination sessions, documentation and follow‑up. It also provides documentation examples and a broad set of real‑world examples illustrating HAZOP studies.

Key topics and technical scope

• Guide‑word driven examination: Use of guide words to identify deviations from design intent and to uncover hazards and operability problems.
• HAZOP study procedure: Steps for initiation, defining scope and objectives, assigning roles and responsibilities, planning and preparation, conducting examination sessions, recording findings, and follow‑up actions.
• Design representation and intent: Guidance on representing system elements, properties and design intent for effective examination.
• Documentation and reporting: Recommended worksheet styles, marked‑up representations, and study reporting, including sign‑off and audit considerations.
• Examples and case studies: Multiple illustrative examples (including procedural HAZOP, control and protection systems, emergency planning and equipment examples) to support practical learning.
• Lifecycle applicability: Guidance for applying HAZOP during concept/definition, design/development, manufacturing/installation, operation/maintenance, decommissioning and retirement stages.

Practical applications

IEC 61882:2016 is used to systematically identify hazards, operational disturbances and risks and to recommend mitigations. Typical applications include:

• Process industries (chemical, oil & gas) to prevent hazards and production deviations.
• Power generation and electrical systems to assess safety and operability of protection and control systems.
• Transportation systems (examples include automatic train protection and procedural checks).
• Procedures and human‑machine interactions (procedural HAZOPs to identify human error risks).
• Emergency planning and maintenance procedures to discover latent operability problems.

Benefits include improved risk identification, clearer design intent documentation, prioritized corrective actions and better auditability of safety decisions.

Who should use this standard

• Safety and risk engineers
• Process, systems and control engineers
• Maintenance and operations managers
• Compliance officers and auditors
• Project managers and designers conducting safety reviews

Related standards

• ISO 31000:2009 (risk management principles)
• ISO Guide 73:2009 (risk management vocabulary)

IEC 61882:2016 is a practical, consensus‑based reference for organizations seeking to apply HAZOP methodology to reduce risks and operability problems and to document risk‑based decisions consistently.