iFluids Engineering works as HAZOP study consultants for refineries, gas processing plants, petrochemical facilities, and offshore platforms across the GCC, India, and Southeast Asia. A HAZOP study that misses a single high-consequence deviation does not fail quietly: it surfaces later as a compressor surge, a runaway reaction, or a relief system sized for the wrong scenario. Our HAZOP study consultants apply IEC 61882 methodology to systematically identify process deviations at every P&ID node, before a design proceeds to construction or an existing unit carries an undocumented risk into its next turnaround.
We scope each engagement to the client’s facility type, project phase, and regulatory context, from greenfield FEED reviews to periodic revalidation of brownfield units. Studies are delivered by multidisciplinary teams experienced across ADNOC, KOC, and Indian regulatory frameworks (OISD, PESO), producing a deviation register that stands up to third-party audit rather than a workshop transcript nobody revisits afterward. Procurement and technical managers engage our HAZOP study consultants precisely because that register needs to survive a regulator’s review months, sometimes years, after the workshop closes.
This page covers what our HAZOP study methodology includes, how it differs from a HAZID study, the industries and facility types we serve, the standards our studies are built against, and the deliverables your project receives.
What Is a HAZOP Study and What Does It Cover
iFluids Engineering delivers HAZOP studies that apply IEC 61882 methodology to identify process deviations, causes, and safeguards at every P&ID node for new and existing oil and gas facilities. Studies produce a structured deviation register accepted by operator HSE teams and regulatory reviewers across the GCC, India, and Southeast Asia.
A HAZOP study examines a defined process unit node by node, using P&IDs and guide words to identify deviations from design intent. IEC 61882 (edition 2.0, 2016) defines seven mandatory guide words, MORE OF, LESS OF, NONE, REVERSE, OTHER THAN, AS WELL AS, and PART OF, applied to every relevant process parameter (flow, pressure, temperature, level, composition) at each node. For the full guide-word breakdown and node structure, see our detailed IEC 61882 methodology guide.
Objective Of HAZOP Study
- The primary objective of the HAZOP study is to identify and evaluate Health, Safety, and Environment (HSE) hazards caused by Process deviations/System failures/Human error. It also helps in identifying operability issues which, are not potentially hazardous, but can compromise the plant’s ability to achieve its design intent and productivity.
- The secondary Objective of a HAZOP study is to identify the deviations and make sure that there are control panels in place to protect the process. The review is carried out using Process and Instrumentation diagrams (P&IDs). HAZOP studies help identify corrective actions, such as additional controls and recommendations, to eliminate or reduce hazards.
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PROJECTS DELIVERED ACROSS THE GLOBE
Importance of HAZOP in Oil & Gas Industry
The Oil and Gas industry is a high-risk industry, with potential risks that can cause significant damage to Personnel, Equipment, & Environment. HAZOP analysis is thereby a valuable tool for risk management and risk assessments in the oil and gas industry.
Here’s how HAZOP analysis can be used to improve risk management in the oil and gas industry:
- Hazard Identification in new and existing processes: HAZOP analysis can be used to identify potential hazards in new and existing systems, such as pipelines, processing plants, and drilling rigs. This information can then be used to develop risk assessments and risk mitigation strategies.
- Evaluating the adequacy of safety controls: HAZOP analysis helps evaluate the adequacy of safety controls in place to prevent and mitigate risks. This information can be used to identify areas where safety controls need to be improved.
- Improving the design and operation of processes and systems: HAZOP can identify design and operational improvements that can reduce the risk of accidents. Example, a HAZOP analysis might identify the need to add additional safety controls, Modify the existing design of a process or system, or develop new operating procedures.
HAZOP vs HAZID: Which Technique Does Your Project Need
iFluids Engineering scopes HAZOP and HAZID as distinct techniques rather than interchangeable labels; combining both, in sequence, is common on larger GCC and Indian projects.
| Aspect | HAZOP | HAZID |
|---|---|---|
| Project stage | Detailed design, P&IDs available | Concept or FEED, before P&IDs are finalized |
| Method | Guide-word deviation analysis per IEC 61882 | Broad, category-based hazard brainstorm |
| Output | Node-by-node deviation register | Facility-level hazard register |
| Typical duration | 3 to 8 facilitated days per unit (industry benchmark) | Shorter, typically 1 to 3 days |
For early-stage projects that need the broader review first, see our HAZID hazard identification service.
Our HAZOP Study Methodology
iFluids Engineering delivers HAZOP studies through a defined, standards-aligned methodology, from node definition through action closeout, for onshore and offshore oil and gas facilities. Our facilitators apply IEC 61882 guide words consistently across every node, producing recommendation registers accepted by ADNOC, KOC, and regional HSE authorities.
- Define scope and nodes: iFluids Engineering divides the process into discrete nodes using P&IDs and process descriptions, establishing clear boundaries before any workshop begins.
- Assemble the multidisciplinary team: process, instrumentation, mechanical, operations, and HSE representatives join under an independent facilitator and scribe.
- Apply guide words systematically: IEC 61882 stipulates that every node be examined against its guide words for each relevant parameter, with causes, consequences, safeguards, and actions documented for every credible deviation. Omitting a single guide word at a high-consequence node is treated as a methodology gap during third-party review, not a minor omission.
- Record and rank findings: deviations are logged in a structured worksheet and screened for scenarios that warrant further quantitative or LOPA-based evaluation.
- Issue the deviation register and action list: findings are assigned to owners with target dates before the final session closes, not after.
- Track closeout: iFluids Engineering supports action tracking through to verification, so the register stays a working document rather than an archived report.
Industry timelines, based on published process safety facilitation benchmarks, run from 3 to 8 facilitated workshop days for a typical refinery process unit, depending on node count and complexity. Preparation work, including P&ID review and node definition, adds time before the first session.
HAZOP Study Step by Step Process
The HAZOP study process typically consists of the following steps:
- The HAZOP team prepares for the study by gathering data’s about the process or system, such as Process and Instrumentation Diagrams (P&IDs), operating procedures, and safety documentation.
- The HAZOP team identifies the nodes in the process. A node is a point or section in the process where a parameter can change. For example, a node could be a pump, a valve, or a reactor.
- The HAZOP team applies a set of guidewords to each node to generate potential deviations from the normal operation of the process or system.
- No flow: What happens if the pump fails?
- More flow: What happens if the valve overpressures?
- Less flow: What happens if there is a leak in the pipeline?
- Reverse flow: What happens if the valve flows backwards?
- Other than oil: What happens if the pipeline is used to transport a different fluid than oil?
- For each potential deviation, the HAZOP team considers the potential hazards and operability problems that could arise. If a hazard is identified, the team recommends actions to mitigate the risk.
- The team documents the results of the study, including the potential deviations, hazards, operability problems, and recommended actions in a HAZOP Report.
HAZOP Basic Rules and Assumptions
The following ground rules were set before proceeding with the HAZOP Session, and the HAZOP Chairman presented a summary at the start of the first day of the workshop:
- Equipment has been designed with adequate design envelopes for start-up, operation and shutdown;
- Equipment is designed and installed as per installation code requirements;
- Equipment and instrumentation are selected and installed compatible to local conditions;
- Double jeopardy’ failures are not considered. Common mode failures are assessed as they are considered a ‘single jeopardy’ failure;
- Flange/gasket leakages are not considered as a cause;
- Spontaneous pipe or vessel rupture is not considered as a cause;
- Single check valves are not generally considered an adequate safeguard against a hazardous backflow on their own; nevertheless, since they provide mitigation against it, they have been recorded as safeguard, when present;
- Minor changes to the P&IDs will be noted clearly on the master P&IDs in red pen, instead of recording as a recommendation at each occurrence; however, when the change is deemed to be significant, this will be also recorded in the HAZOP log sheets;
- Prolonged & side discussion shall be avoided. The objective is to identify potential hazards not to design them out during the workshop; when disagreement arises, a recommendation will be issued;
- Time will not be spent on finding solutions, unless solution is obvious;
- Sections of the existing plant will not be considered in detail; only impacts to/ from the new Project facilities to these sections will be assessed.
Industries and Facilities We Serve
iFluids Engineering performs HAZOP studies across refineries, gas processing plants, petrochemical complexes, LNG terminals, and offshore platforms throughout the GCC, India, and Southeast Asia. Our HAZOP study consultants have supported projects for national oil companies and EPC contractors across brownfield revamps and greenfield design phases alike.
Facility types range from crude distillation units and hydrotreaters to LNG storage and regasification terminals, gas gathering stations, fertilizer plants, and green hydrogen production plants. OISD 206 mandates that a HAZOP revalidation be triggered when an Indian facility undergoes a significant process change, with the review limited in scope to the modified nodes rather than the entire unit. Offshore projects bring their own constraints: our HAZOP study consultants scope platform and FPSO studies around confined workshop time, distributed process layouts, and the interface risks that arise when multiple contractors work the same facility concurrently. Where a project’s scope centers on control and instrumentation systems rather than the process itself, our CHAZOP study service applies a parallel guide-word methodology to programmable electronic systems and control loops.
Regulatory and Standards Compliance
iFluids Engineering structures every HAZOP study to meet IEC 61882 methodology requirements alongside the regional regulatory frameworks our GCC, India, and Southeast Asia clients operate under, including OISD, PESO, and ADNOC and KOC contractor HSE specifications. Our reports are built for direct submission to operator and regulatory reviewers.
IEC 61882 governs the HAZOP methodology internationally and forms the technical basis for every study iFluids Engineering delivers, regardless of the client’s local regulatory overlay. In India, OISD 206 requires operators to identify hazards and analyze risk through structured methodologies including HAZOP, and to revalidate the hazard register every five years or after a significant process change; a study delivered without a defined revalidation trigger leaves the client’s register treated as outdated at the next compliance audit. Facilities operating under ADNOC and KOC contractor HSE frameworks require that HAZOP facilitators and study teams hold accreditation recognized by those operators, a requirement iFluids Engineering’s regional study teams are structured to meet.
HAZOP Study Guidewords
The following table summarizes the main guidewords that were applied and the typical deviations obtained combining the guidewords and the process parameters.
| Parameter | Guideword | Definition |
| Flow | More Less Reverse No Other than As well as Misdirected | Quantitative Increase Quantitative decrease, includes no flow Reverse/ opposite direction Complete negation of the Design intent Complete substitution Qualitative modification/ increase |
| Pressure | More Less No | More than normal operating Less than normal operating Vacuum |
| Temperature | More Less | More than normal Less than normal |
| Level | More Less | More than normal Less than normal |
| Composition | Change Contamination | Corrosive Contamination Out of specifications |
| Others | Start-up/ Shutdown Maintenance Corrosion Utilities Failure Vent/Drain Safety | Leakage or release to atmosphere Deviations related to mentioned conditions |
HAZOP Checklist
A HAZOP checklist is a tool that can be used to identify potential hazards in a system . It is a systematic approach to examining the process and identifying any error occurring from the intended design or operation. The HAZOP team assesses the severity and likelihood of each deviation, and proposes recommendations for eliminating those hazards.
| No or None | Complete Negation (Failure of a Function) |
| More | Quantitative Increase |
| Less | Quantitative decrease |
| Reverse | Opposite of the design Intent |
| Part of | Qualitative decrease |
| AS well as | Qualitative Increase |
| Other than | Complete Substitution |
| Early/later | Relative to a clock |
| Before/ After | Relating to an order/a sequence |
| Too long/ Too late | Considering a required time |
| Too short/ Too soon | Considering a required time |
The Input documents required by the HAZOP team are as follows
- PFD’s
- P&IDs for Process & Utilities
- HSE Risk Matrix and Response Chart
- Heat and Mass balances
- Plot Plans or General Equipment Arrangements & Elevation Drawings
- Material Specifications and Selection Charts
- Cause and Effect Diagrams
- Process Design Basis
- Process Operation & Control Philosophy
- Operations and Maintenance Manual
A brainstorming session will be held onsite with the multidisciplinary team along with the HAZOP Chairman and Scribe. The session will be discussed for each node, deviation, safeguards available and mitigation measures & recommendations will be recorded with the help of software PHA Pro.
The Team indulged in HAZOP Analysis has a good knowledge of Plant Operation. Hence there wouldn’t be any chance of Field Survey as all required information can be obtained from Operating Personnel through discussions. Interviewing the Plant Operators in their working Day for few Hours will yield relevant information required to make a Hazard List which will be categorized based on frequency and Severity attributes using Checklists.
Why Engineering Teams Choose iFluids
Engineering teams choose iFluids Engineering as their HAZOP study consultants because our facilitators hold accreditation recognized by ADNOC and KOC, and because iFluids Engineering is certified to ISO 9001, ISO 45001, ISO 14001, and ISO 27001. We have delivered HAZOP studies across India, Qatar, Oman, and Southeast Asia.
iFluids Engineering’s HAZOP study consultants are accredited to work under ADNOC and KOC contractor frameworks, a requirement most independent consultancies serving the region cannot meet without a dedicated regional presence. ISO 45001:2018 Clause 6.1.2 requires organizations to determine the competency of anyone conducting hazard identification and risk evaluation on their behalf, a requirement that directly shapes which third-party consultancies GCC operators can accept a HAZOP register from. Beyond accreditation, iFluids Engineering holds ISO 9001, ISO 45001, ISO 14001, and ISO 27001 certification, covering quality management, occupational health and safety, environmental management, and information security across every engagement. Facilitation teams are drawn from Chennai, Qatar, Oman, Abu Dhabi, and Malaysia offices, matched to each facility’s specific regulatory and technical context rather than assigned generically.
Deliverables and Outcomes
iFluids Engineering’s HAZOP studies conclude with a structured deviation register, a prioritized recommendation list with assigned owners and target dates, and a closeout tracking log, not a workshop transcript. Deliverables are formatted for direct submission to operator HSE teams and regulatory reviewers across the GCC, India, and Southeast Asia.
IEC 61882 specifies that HAZOP results be recorded as a structured deviation register rather than a risk-ranking exercise, an output format iFluids Engineering delivers as three cross-referenced documents per unit: a node-by-node deviation worksheet, a consolidated recommendation register, and a closeout tracking log. Studies that surface scenarios warranting further quantification are screened and handed to a defensible LOPA process rather than left as an open qualitative finding. A recommendation register delivered without assigned owners and dates is a common point of failure industry-wide: unassigned action items are frequently the reason findings remain open long after a facility’s next planned turnaround, unrelated to the quality of the original HAZOP session itself. This is why iFluids Engineering’s HAZOP study consultants close every session with owners and dates fixed, not deferred to a follow-up email.
Frequently Asked Questions
Duration depends on facility complexity and node count. A single process unit typically requires 3 to 8 facilitated workshop days, based on published process safety facilitation benchmarks. Preparation, including P&ID review and node definition, adds time before sessions begin. iFluids Engineering scopes the schedule during initial project discussions, before the first session is booked.
Cost depends on facility complexity, node count, and whether preparation work such as process description writing falls inside or outside the scope. Fixed costs cover preparation, reporting, and review; variable costs scale with the number of facilitated workshop days required. iFluids Engineering provides a scoped quote after reviewing your P&IDs and project phase.
A HAZID is a broad, early-stage hazard identification review, typically run before detailed P&IDs exist. A HAZOP is a detailed, guide-word-driven examination of process deviations once P&IDs and control philosophies are finalized. Many GCC and Indian projects run both in sequence. iFluids Engineering scopes each project to the technique, or combination, the risk profile and project stage actually require.
Yes. A brownfield HAZOP re-examines a unit after a significant process change or on a scheduled revalidation cycle, often required every five years under standards such as OISD 206. iFluids Engineering scopes brownfield revalidations to the modified nodes where the original register remains traceable, rather than re-running the full unit unnecessarily.
A HAZOP facilitator should be independent of the design team, experienced with IEC 61882 methodology, and familiar with the process type under review. For GCC facilities operating under ADNOC or KOC contractor frameworks, the facilitator and study team should also hold accreditation recognized by those operators. iFluids Engineering assigns facilitators matched to each facility’s regulatory context.
Studies require current P&IDs, process flow diagrams, process descriptions, and the client’s risk ranking matrix or acceptance criteria. Equipment datasheets and cause-and-effect diagrams are needed where instrumented safeguards fall inside the scope. Missing or outdated P&IDs are the most common cause of schedule slip. iFluids Engineering confirms the exact document list during scoping, before the first workshop session is booked.
Ready to Discuss Your Project
iFluids Engineering is ready to scope your next HAZOP study, whether you are reviewing a greenfield design package or revalidating a brownfield unit ahead of a compliance audit. As HAZOP study consultants accredited under ADNOC and KOC contractor frameworks, and certified to ISO 9001, ISO 45001, ISO 14001, and ISO 27001, we assign facilitation teams matched to your facility’s regulatory context, whether that is OISD, PESO, or a GCC operator’s own HSE specification.
Share your P&IDs, project phase, and target timeline, and we will return a scoped proposal covering node count, facilitated workshop days, and deliverable format. For a look at how this methodology has been applied on a comparable facility, see our green hydrogen plant HAZOP case study.
Contact iFluids Engineering to discuss your HAZOP study scope, timeline, and regulatory requirements. External reference: IEC, publisher of IEC 61882.
