UEEHA0018 — Classify areas where flammable gas or vapour hazards may arise

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What an assessment for UEEHA0018 must cover

31 assessable components: 3 elements (15 performance criteria), 5 performance evidence and 11 knowledge evidence requirements. An audit-defensible tool maps every question and task back to these — that mapping is the coverage matrix Auditori generates alongside the assessment.

Elements & performance criteria

1 Determine the type and extent of explosion hazard

1.1Knowledge of the safety principles and objectives of area classification and methods applied to examining the extent to which an explosive hazard may arise
1.2Extensive knowledge of gas and vapour characteristics are applied
1.3Consideration is given to reducing the extent of explosion hazards by the application of a hierarchy of risk controls
1.4The likelihood of an explosive atmosphere occurring, in accordance with the definitions of zones, is established from process and plant layout drawings and specifications, and by consultation with process-operating personnel
1.5The parameters of flammable materials and the processes by which they may arise affecting the type and extent of zones are obtained and listed together with the sources from which they came
1.6Sources and grades of release of flammable gases or vapours that may occur are established from first principles with reference to process, instrumentation and plant layout drawings and specifications and by consultation with process and engineering design personnel
1.7Characteristics of release are assessed with the factors affecting those characteristics including gas mixtures
1.8Consideration is given to eliminating or reducing the likelihood of an explosive atmosphere arising in consultation with process, operating and engineering personnel
1.9Understanding of ventilation and dispersion aspects and the application of artificial ventilation is applied including estimations/calculations of the ventilation rates to reduce an explosive gas atmosphere in consultation with process and engineering design personnel

2 Establish the area classifications

2.1Acceptable methods for establishing the type and extent zones are applied
2.2The use of illustrative examples in establishing the type and extent of zones is validated in accordance with the standards and any limitations are documented
2.3The types and extent of zones are established from the data collected in the analysis of the area and in consultation with process and engineering specialist personnel

3 Document classification process and delineation of zones

3.1The classification process taken, relevant material properties and justification for the classifications given is documented in accordance with provisions of standards
3.2Sources of release and zones are shown on plant drawing in accordance with provisions of standards
3.3All classification documents are filed for future reference and forwarded to the appropriate personnel for inclusion in the verification dossier

Performance evidence

establishing the likelihood of an explosive atmosphere arising including: - reviewing process, instrumentation and plant layout drawings and specifications to identify sources and grades of release - obtaining properties of materials relevant to the area classifications - estimating/calculating the rates of release and release conditions
considering means of eliminating or reducing risks of an explosive atmosphere arising in the presence of a potential ignition source including: - elimination or relocation of potential ignition sources - elimination or relocation of sources of release
investigating the application and influence of ventilation and dispersion factors including: - determining the rate and availability of ventilation and dispersion factors - applying guidance given in standards to assess the degree of dilution and the persistence of an explosive gas atmosphere
establishing the types and extent of zones for the final plant/process design including: - analysing the collected data - using appropriate analysis methodologies - consulting process and engineering specialist personnel
documenting area classification in accordance with provisions of standards.

Knowledge evidence

safety principles and objectives of area classification encompassing safety and economic aspects including: - reducing the likelihood of a gas atmosphere occurring - using equipment that has a low likelihood of creating an ignition source - relative cost of compliant equipment within the classified zones
properties of hazardous materials including: - properties of materials relevant to area classification such as, molecular mass, flash point, boiling point, ignition temperature, vapour pressure, vapour density, explosive limits, equipment group and temperature class - sources from which properties of explosive hazardous material can be obtained
fundamentals of all alternative analysis methodologies
sources and grades of release of a flammable gas or vapour hazard including: - items of plant that should be considered as potential sources of release including those giving: - continuous grades of release - primary grade of release - secondary grade of release - the criteria on which openings are considered a source of release - the criteria for establishing the zones in which an explosive atmosphere may arise
release rate of gas or vapour including: - geometry of the source of release - release velocity - concentration - volatility of a flammable liquid - liquid temperature - methods and equations for estimating the release rate of liquid and the release rate of gas, including the limitations and accuracy of the selected equations
ventilation and dispersion including: - location of sources of release in relation to ignition sources - effects of climatic conditions and topography - nature and mechanisms for dispersion and dilution
ventilation including: - purpose - types and degrees of ventilation - methods for estimating and calculating ventilation and dispersion criteria - influence of independent ventilation on types of zones
multiple sources of release
acceptable methods for establishing the type and extent of zones including: - limitations and application in the use of illustrative examples - generalized methods - limitations and use of calculation methodologies in relevant standards - suitability and use of modelling tools such as CFD - alternative codes - relationship to ‘equipment protection level’ (EPL) and risk assessment
fundamentals of all alternative analysis methodologies
recommendations for documenting classification decisions including: - steps which lead to the final area classification including: - recommendations from relevant standards and codes - gas and vapour characteristics and calculations - study of ventilation and dispersion characteristics - data sheets and tables listing flammable material characteristics and sources of release - drawings showing the type and extent of zones, equipment groups and ignition temperature.

Unit content sourced from training.gov.au — © Commonwealth of Australia, licensed under CC BY 4.0. Auditori is not affiliated with the Department of Employment and Workplace Relations.

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Questions about assessing UEEHA0018

What does an assessment tool for UEEHA0018 need to cover?

To satisfy the Principles of Assessment and Rules of Evidence, an assessment for UEEHA0018 needs to address all 31 unit components: 3 elements with 15 performance criteria, 5 performance evidence requirements, 11 knowledge evidence requirements, and the foundation skills. A coverage matrix mapping each question and task to these components is what an auditor looks for.

How does Auditori generate an assessment tool for UEEHA0018?

Auditori pulls the current release of UEEHA0018 from training.gov.au and generates a complete package: candidate assessment, assessor guide with model answers and observation criteria, and a coverage matrix mapping every component. A suitably qualified person then reviews and approves the draft in a built-in workflow — consistent with ASQA's guidance on AI use in VET — before export as branded PDF and editable Word.

Is the first assessment tool really free?

Yes. Every new account includes one free credit — enough to generate the complete assessment tool for UEEHA0018 — with no card and no subscription required. After that it's pay-as-you-go per unit.

Can I check my existing UEEHA0018 assessment instead of generating a new one?

Yes — upload your existing assessment or learner guide and Auditori maps it against every element, performance criterion, PE and KE of UEEHA0018, showing exactly what's covered and what's missing. Mapping costs a quarter of a credit.

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