HAZOP Study
HAZOP Study – Hazard and Operability Study
A HAZOP study is a structured, team‑based review of process deviations and their risks.
HAZOP Study (Hazard and Operability Study) Overview
A HAZOP study provides a structured, team-based review of process deviations and their risks. It examines what can go wrong when design or operating conditions drift from their original intent and how those deviations are controlled.
During the study, each deviation is analyzed for causes, consequences, existing safeguards, and recommended actions. Workshops are run in clear, time-boxed sessions, led by an experienced facilitator and supported by a dedicated scribe. The outcome is a prioritized, defensible action list and a transparent risk rationale.
The format is straightforward for both engineers and non-specialists. With guidance from our team, you move step by step from initial scoping to a complete, usable report.
Background & Regulatory Context
HAZOP originated in the process industries and has evolved into current best practice for detailed Process Hazard Analysis (PHA). It is widely recognized as a core PHA technique for complex process systems.
International guidance such as IEC 61882 describes the HAZOP method and its application. Many jurisdictions expect a documented PHA for covered facilities and projects, and HAZOP is often the central technique used to meet that expectation.
Major hazard frameworks (e.g., Seveso / COMAH) rely on systematic risk identification and control. Functional safety work (e.g., IEC 61511) frequently builds on HAZOP outcomes to define Safety Instrumented System (SIS) targets.
Organizations adopt HAZOP because it delivers consistent insight, traceability, and audit readiness across the lifecycle of a facility.
-
How a HAZOP Study Works – Step by Step
- Preparation
The work starts with aligning the study with your objectives and project context:
- Clarifying purpose, scope, and boundaries.
- Confirming applicable standards and client risk criteria.
- Collecting and quality checking PFDs, P&IDs, control narratives, and operating procedures.
- Defining study nodes by process sections, lines, or equipment.
- Agreeing roles, agenda, and workshop logistics.
- Finalizing the study template and action tracking approach.
Thorough preparation ensures that workshop time is focused on high-quality discussion rather than resolving basic input issues.
- Workshop Execution
In the workshop phase, your team is guided through a systematic review of each node:
- Applying standard HAZOP guide words (e.g., No, More, Less, Reverse, As well as, Other than).
- Considering credible causes such as equipment failures, human factors, utility interruptions, and external events.
- Describing consequences for safety, health, environment, product quality, and business impact.
- Recording current safeguards and assessing their independence.
- Formulating practical recommendations that reduce risk or strengthen protection layers.
- Keeping discussions focused, factual, and easy to follow.
Our facilitators manage pace and depth so that the team maintains both rigor and momentum.
- Risk Evaluation and Optional LOPA
Once deviations and recommendations are captured, attention shifts to risk evaluation:
- Ranking scenarios using your risk matrix or a jointly defined one.
- Identifying Independent Protection Layers (IPLs) where applicable.
- Performing LOPA for selected high-risk scenarios when deeper quantification is helpful.
- Mapping results to SIL targets if functional safety is in scope.
- Capturing the rationale behind each decision to support future audits and reviews.
This step ensures that HAZOP outcomes connect directly to your risk criteria and functional safety requirements.
- Reporting and Follow-Up
After the workshops, the outputs are consolidated into clear, usable documentation:
- A structured HAZOP report with node tables, deviations, and actions.
- An executive summary tailored for leadership and key stakeholders.
- A clean action register with owners, priorities, and due dates.
- Mark-ups or comments on drawings where these add clarity.
- An agreed revalidation timetable aligned with your management system.
- Ongoing availability of our team to support action close-out and design changes.
The result is a package that serves day-to-day engineering needs as well as regulatory and third-party scrutiny.
Deliverables and Value
Deliverables
- HAZOP report with node-by-node deviation tables and recommendations.
- Risk ranking aligned to your criteria and assumptions.
- Action register with owners, priorities, and target dates.
- Safeguard and IPL map highlighting gaps and overlaps.
- LOPA summary and SIL targets where included.
- Executive briefing pack for stakeholders and auditors.
- Revalidation plan and change management notes.
Value for our Customers
- Clear insight into what can go wrong and how it is controlled.
- A defensible basis for technical decisions, budgets, and design choices.
- Smoother interactions with regulators and third-party auditors.
- Reduced uncertainty during commissioning and operations.
- A shared understanding of risk across engineering, operations, and HSE.
- Confidence that the team is applying an industry-proven method.
Our process safety specialists will provide an initial consultation and guide your team through the HAZOP process — from the first scoping discussion to a practical, compliant outcome.
