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Hazard Studies & Risk Assessment

Our team runs the full range of qualitative and quantitative hazard studies for your facility, from HAZOP and SIL through LOPA, QRA, FERA and consequence modelling, so that you and your leadership can make risk decisions grounded in clear evidence rather than assumption.

Strategic context

Why hazard studies & risk assessment matters

Hazard Studies and Risk Assessment is the engine that turns complex process hazards into defensible, decision grade risk evidence. From IEC 61882 HAZOP at FEED through QRA, FERA, SIL allocation, LOPA, ALARP demonstration and post incident revalidation, our studies underpin every downstream investment, regulatory submission and operating decision you make. The work is anchored by certified facilitators, tool validated software in PHA Pro, PHAST, exSILentia, BowTieXP and FLACS and an action traceability discipline that holds up through multi year close out cycles and statutory revalidation.

Hazard Studies & Risk Assessment
Engagement model

How we deliver

A phased, evidence led delivery model that runs from discovery through close out and is built around your facility, regulatory context, and lifecycle stage.

Scope and Risk Matrix Calibration
We define the study boundaries, applicable codes and P&ID issue revision, calibrate a site specific tolerable frequency matrix and form a multidisciplinary team with your operations, engineering and HSE people.
HAZID and HAZOP Execution
Our facilitators lead the workshops per IEC 61882 and ISO 17776, working node by node through a guide word review with rotating discipline scrutiny.
Quantification through LOPA, SIL, QRA and FERA
We run the downstream studies as required, covering LOPA IPL credit, SIL allocation, QRA IRPA and F N, FERA thermal and overpressure and OBRA building risk.
Action Ranking and Defensible Trail
We risk rank the actions, assign ownership and target close out dates and document the evidence chain through the PHA Pro, BowTieXP and exSILentia record.
Revalidation and MOC Integration
We embed a five year revalidation cycle with MOC trigger criteria and provide a regulator and underwriter examination dossier whenever you need it.
Outcomes & value

What this service delivers

  • A risk ranked action register with a defensible trail for regulators and underwriters
  • A SIL allocated SIF inventory handed off cleanly to functional safety engineering
  • QRA evidence that supports permitting, insurance and project finance
  • A Bow Tie barrier register that drives ongoing operational discipline
  • A statutory five year revalidation framework integrated with your site MOC
Why Arborion

Our differentiators

  • Certified facilitators across every study type including HAZOP, SIL, LOPA, FERA, QRA and OBRA
  • Tool validated workflows in PHA Pro, PHAST, exSILentia, BowTieXP and FLACS
  • Integrated study sequencing that runs HAZOP into LOPA into SIL into FERA in one engagement
  • COMAH, SEVESO, OSHA PSM and MSIHC defensibility built in

Standards we work to

IEC 61882 (HAZOP)ISO 17776 (HAZID offshore)CCPS Guidelines for Hazard Evaluation Procedures (3rd Ed.)IEC 61511 Clause 8 (Hazard and Risk Analysis)OSHA 29 CFR 1910.119(e)Energy Institute HAZOP GuideCCPS Bow Tie GuidelinesMSIHC Rules 1989 (India)Factories Act 1948 Section 41B (India)API 2000 (Tank Venting)NFPA 2 (Hydrogen)CCPS QRA Guidelines (2nd Ed.)Purple Book CPR 18E (RIVM)HSE PADHI / SPC Permissioning

Industries we serve

  • Oil and Gas across Upstream, Midstream and Downstream
  • Refineries and Petrochemicals
  • LNG, Cryogenic and Hydrogen
  • Specialty and Bulk Chemicals
  • Pharma and API Manufacturing
  • Power and Fertilizer

Frequently asked questions

What does a hazard study and risk assessment involve?

It is the work that turns complex process hazards into defensible, decision grade risk evidence. We run the full range of qualitative and quantitative studies covering HAZOP and HAZID, SIL assessment, Layer of Protection Analysis, Bow Tie analysis, Quantitative Risk Assessment, Fire and Explosion Risk Analysis, consequence and dispersion modelling and ALARP demonstration. Our facilitators lead the workshops and our tool validated workflows document a clear evidence chain through to close out.

Which methodologies and standards do you apply?

We apply IEC 61882 for HAZOP and ISO 17776 for HAZID, the CCPS LOPA Guidelines for layer of protection analysis, the Purple Book CPR 18E and HSE PADHI for quantitative risk assessment, ISA TR84.00.07 for fire and gas coverage mapping, API RP 752, 753 and 756 for facility siting and occupied building risk, and the CCPS and IOGP Bow Tie methodology. The studies are built for COMAH, SEVESO, OSHA PSM and MSIHC defensibility.

When should these studies be carried out?

A HAZID belongs at the FEED stage and a detailed HAZOP at detailed design, both before the design freezes. QRA, FERA, SIL allocation and LOPA follow to support permitting, insurance and project finance decisions. Studies should then be revalidated on a five year cycle and whenever a Management of Change trigger fires or an incident reveals a new scenario, so the risk picture stays current across the life of the facility.

What do we receive at the end of a study?

You receive a risk ranked action register with clear ownership and target dates and a defensible trail for regulators and underwriters, a SIL allocated safety function inventory ready to hand to functional safety engineering, QRA evidence that supports permitting and finance, a Bow Tie barrier register that drives operational discipline, and a five year revalidation framework integrated with your Management of Change process.

Which industries do you run these studies for?

We run hazard studies for oil and gas across upstream, midstream and downstream, refineries and petrochemicals, LNG, cryogenic and hydrogen facilities, specialty and bulk chemicals, pharmaceutical and API manufacturing, and power and fertilizer plants. The tool set includes PHA Pro, PHAST, exSILentia, BowTieXP and FLACS.

Get in touch

Talk to us about hazard studies & risk assessment.

Connect with our team for a consultation scoped to your facility, regulatory context, and lifecycle stage.