Hazard and Operability (HAZOP)

A HAZOP study is one of the most consequential safety engineering activities in the lifecycle of a hydrogen or other industrial facility. Conducted correctly, it identifies process deviations and hazardous scenarios before they become incidents — and produces the safeguard recommendations that form the foundation of your safety case, satisfy regulatory requirements, and withstand lender and insurer scrutiny. These studies represent a crucial component of Process Safety Management (PSM), aiding in the identification of hazards and the assessment of associated risks.

Conducted poorly, it produces paperwork that checks a compliance box but misses the risks that matter.

Hydrogen presents a specific set of process hazards — a wide flammability range of 4 to 75 percent in air, extremely low minimum ignition energy, high buoyancy (warm gas) and diffusivity, embrittlement of certain metals under pressure, and the potential for deflagration-to-detonation transition in confined spaces. A HAZOP facilitator without direct hydrogen process experience will not recognize these hazards as quickly, structure the study nodes to capture them as thoroughly, or challenge design assumptions as effectively as one who does.

River Energy Solutions provides hydrogen-specific HAZOP support and process hazard analysis that meets OSHA PSM, EPA RMP, and industry standard requirements — and produces a study output that satisfies insurers, lenders, and regulatory authorities.

What is a HAZOP study?

HAZOP — Hazard and Operability Study — is a structured, systematic technique for identifying process hazards and operability problems in a facility design. Developed by ICI in the 1960s, it has become the industry standard process hazard analysis methodology for chemical, petrochemical, and energy facilities worldwide. The American Society for Chemical Engineers, along with the Center for Chemical Process Safety (CCPS), acknowledges HAZOP as a fundamental element of PSM, specifically within the framework titled "Understand Hazards and Risks." It stands as a pillars in the practice of Hazard Identification and Risk Analysis (HIRA).

A HAZOP study works by systematically examining each section of a process — defined as a node — and applying a standardized set of guide words to the design intention for that node. Each guide word generates a deviation from design intent, which the multidisciplinary study team evaluates for causes, consequences, existing safeguards, and recommended actions.

The output is a HAZOP worksheet documenting every deviation examined, every credible cause identified, every consequence assessed, every safeguard evaluated, and every action item generated. For hydrogen facilities, this worksheet becomes a core document in the safety case, regulatory filing, insurance submission, and lender independent technical assessment.

River Energy Solutions HAZOP and PHA services

We provide the range of process hazard analysis services for hydrogen and clean energy facilities, tailored to project stage, regulatory requirements, and client needs.

HAZOP Support

• Support for HAZOP study for hydrogen production, compression, storage, fueling, and other process systems
• Reivew of P&ID-based node definition and guide word application structured for hydrogen or other process hazards
• Multidisciplinary study team management — process, mechanical, operations, and safety
• Reivew of HAZOP worksheet development, cause-consequence-safeguard documentation, and action item list
• Action item close-out review and safeguard verification

What-if analysis

For simpler hydrogen systems — small-scale electrolyzers, fueling stations, and laboratory installations — a structured What-If analysis provides proportionate process hazard coverage at lower cost and time commitment than a full HAZOP. River Energy facilitates What-If studies using hydrogen-specific scenario libraries developed from direct project experience.

HAZOP revalidation and management of change

• Five-year HAZOP revalidation as required by OSHA PSM — review of previous study, assessment of changes, and updated action item register
• Management of change (MOC) hazard reviews for process modifications, equipment replacements, and operating condition changes
• Pre-startup safety reviews (PSSR) for new or modified hydrogen systems

Consequence analysis support

• Qualitative consequence assessment for HAZOP scenarios — flammable cloud, and jet fire, scenarios specific to hydrogen releases
• Input to quantitative risk assessment (QRA) and EPA RMP off-site consequence analysis
• Safeguard adequacy review — evaluation of whether existing and proposed safeguards reduce risk to acceptable levels

HAZOP preparation and P&ID review

• Pre-HAZOP P&ID review — identification of P&ID deficiencies, missing safeguards, and unclear design intent before the formal study
• HAZOP scope definition and node list development
• Study team composition recommendations and participant preparation
• Design basis review — identification of gaps that generate unnecessary HAZOP action items