Reservoirs, tanks, vats and similar containers (other than for compressed or liquefied gas), of iron, steel or aluminium, of a capacity exceeding 300 litres, not fitted with mechanical or thermal equipment

1. Scope and Applicability

This PCR covers the factory-gate production of finished passive reservoirs, tanks, vats, and similar containers made of iron, steel, or aluminium, with a capacity greater than 300 litres, that are not designed for compressed or liquefied gas and are not fitted with mechanical or thermal equipment. It covers shop fabrication from purchased metal products through cutting, forming, joining, conditional surface finishing, inspection, and release for dispatch.

The PCR excludes containers of 300 litres or less; cylinders and other containers for compressed or liquefied gas; boilers, heat exchangers, agitated or mechanically equipped vessels; pumps, valves, external piping, foundations, site erection, installation, use, maintenance, and end-of-life. Integral passive nozzles, manways, stiffeners, supports, and factory-applied protective finishes are included when delivered as part of the product. Product design, material grade, nominal capacity, pressure basis, finish, and factory test state shall be declared. The official CPC source fixes the category boundary but does not supply inventory quantities (un-cpc-3-0-structure-2025).

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.fabricated-metal-products-except-machinery-and-equipment.reservoirs-tanks-vats-and-similar-containers-other-than-for-compressed-or-liquefied-gas-8adef04a
classification_refs	CPC 3.0: 42210 (exact classification context; mapping acceptance remains a separate repository decision)
covered_products	Finished passive iron, steel, or aluminium reservoirs, tanks, vats, and similar containers with capacity greater than 300 L, including delivered integral passive fittings and protective finish
excluded_products	Containers ≤300 L; compressed- or liquefied-gas containers; vessels fitted with mechanical or thermal equipment; boilers; heat exchangers; stand-alone pumps, valves, piping, foundations, and site installation
representative_product	A fully fabricated, inspected, factory-gate steel or aluminium storage/process tank exceeding 300 L, supplied without mechanical or thermal equipment
production_route	Purchased plate or sheet receipt; cutting and forming; welding/joining; route-specific surface preparation and coating; inspection and factory release
market_state	Finished dry container at the manufacturing gate; material grade, alloy, nominal capacity, wall thickness, coating/lining state, integral fittings, test state, geography, and production year declared

3. Reference Flow

Field	Value
What	Supply of a finished passive large metal reservoir, tank, vat, or similar container ready to leave the manufacturing gate
How much	1 kg net mass of conforming finished product, excluding temporary transport fixtures and test water
How well	Capacity greater than 300 L; iron, steel, or aluminium construction; not for compressed or liquefied gas; no fitted mechanical or thermal equipment; declared grade, capacity, finish, fittings, and inspection state
How long or cycle	One factory-gate product delivery; no service life is represented, and any downstream use-stage duration must be modelled separately
reference_flow_link	The mass of conforming finished_tank_output released by inspection_dispatch, normalized to 1 kg

Field	Value
Reference amount	1 kg
Reference product flow	Finished large metal reservoir, tank, vat, or similar container
Reference flow property	Mass 93a60a56-a3c8-11da-a746-0800200b9a66
Reference unit group	Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66
Reference unit	kg
Required qualifiers	base metal and grade; primary/secondary material route where known; nominal capacity (>300 L); wall thickness and product mass; intended contained medium; confirmation that compressed/liquefied-gas service is excluded; confirmation that mechanical/thermal equipment is absent; coating or lining system and cured state; integral fittings; factory test method and result; manufacturing geography; production period

When constructing a foreground data package, the items listed in Required qualifiers must be declared in dataset metadata, process notes, reference flow comment, product description, or an equivalent data package field. Missing required qualifiers make the reference flow definition incomplete for that data package. The reference-product UUID remains unresolved and must not be replaced by an uncoated intermediate container-body UUID.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_product_mass	finished_tank_output and all normalized inventory rows	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Determine net mass of one conforming finished product after draining test water and excluding temporary transport fixtures; normalize all rows to 1 kg of this mass.
electricity_energy	forming_electricity, joining_electricity, finishing_electricity, inspection_electricity	Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66	MJ	Preserve metered electrical energy and convert kWh to MJ using 3.6 MJ/kWh; disclose voltage level, grid/on-site supply split, and allocation of shared meters.
gas_reference_conditions	welding_argon	Volume	m3	Record delivered argon at the supplier or meter reference temperature and pressure; do not combine argon with carbon dioxide or another shielding gas, and disclose any conversion from cylinder mass.
water_mass_basis	surface_treatment_water, hydrotest_water, and related wastewater rows	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Record makeup water crossing the foreground boundary; if measured as volume, apply a documented density and reference condition, and distinguish reused internal water from new input.
coating_as_supplied_mass	epoxy_coating	Mass	kg	Record the as-supplied formulated coating mass and separately disclose solids fraction, mixed components, solvent/water content, and cured coating retained on the product; do not report only dry film mass as purchased coating.

5. System Boundary

Boundary Abstraction

Field	Value
declared_starting_condition	Purchased steel plate or aluminium plate and other purchased consumables received at the manufacturing gate, with supplier identity, grade, mass, and delivery state documented
starting_condition_role	Foreground gate-to-gate starting point for fabrication; upstream production of purchased materials and energy is represented by linked upstream datasets, not re-created inside the foreground process
product_classification_scope	Passive iron, steel, or aluminium containers greater than 300 L, excluding compressed/liquefied-gas service and fitted mechanical or thermal equipment
recursive_input_rule	A purchased same-category container incorporated into another delivered container is recorded once as a product input with its own upstream dataset and declared product state; its fabrication is not recursively expanded in this foreground package
upstream_dataset_requirement	Link supplier- and route-representative datasets for metal plate, electricity, process water, sodium hydroxide, welding consumables, shielding gas, coating, and any other actual purchased input; disclose geography, technology, recycled content, and temporal representativeness
disclosure	Declare included shop operations, outsourced operations, shared-utility allocation, scrap destination, surface-treatment route, coating system, test-water reuse, emission controls, excluded capital goods, and any transport or installation brought into scope

rule_id	applies_to	rule	source_ids
boundary_factory_gate	foreground manufacturing	Include purchased-input receipt, cutting/forming, welding/joining, route-specific surface finishing, inspection, on-site waste or emission control, and release of the finished product through the manufacturing gate.	un-cpc-3-0-structure-2025; us-ecfr-40-cfr-63-subpart-xxxxxx
boundary_conditional_finishing	surface treatment and coating	Include aqueous treatment, cleaning, coating application, curing, and equipment cleaning only when performed for the declared product; record each chemical, coating, waste, and emitted substance as a separate exchange.	eu-jrc-stm-bref-2006; us-ecfr-40-cfr-63-subpart-xxxxxx
boundary_outsourced_operations	outsourced fabrication	Include an outsourced operation by its supplier process dataset and the product or service crossing the reporting boundary; avoid double counting its direct energy, chemicals, wastes, or emissions at the reporting factory.	eu-commission-recommendation-2021-2279
boundary_exclusions	downstream and non-product activities	Exclude installation, foundations, external piping, use, maintenance, decommissioning, and end-of-life from this factory-gate profile unless the study explicitly expands the boundary and reports them separately.	un-cpc-3-0-structure-2025

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
material_preparation_forming	Material preparation, cutting, and forming	required	Always; include only the declared steel and/or aluminium material rows	Foreground fabrication	Per kg conforming finished product
joining_assembly	Welding, joining, and assembly	required	Always; activate each consumable and shielding-gas row only for the documented joining route	Foreground assembly	Per kg conforming finished product
surface_finishing	Surface preparation and protective finishing	conditional	Include when chemical cleaning, aqueous treatment, or factory-applied coating/lining is performed	Foreground finishing	Per kg conforming finished product and declared treated area
inspection_dispatch	Inspection, testing, draining, and factory release	required	Always; hydrostatic-test water rows apply only when a water test is performed	Foreground quality release	1 kg net conforming finished product

Process: Material preparation, cutting, and forming (material_preparation_forming)

Inputs

Product flows

Steel plate input (steel_plate_input)

Record purchased steel plate crossing the factory boundary when the declared product contains iron or steel. The row is not applicable to a wholly aluminium product; alloy, grade, thickness, coating state, supplier, and recycled content remain product-specific qualifiers.

• Selected flow: Steel plate
• Flow property / unit: Mass / kg
• Amount rule: measured accepted plate mass issued to the product order, net of returned unused stock
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_and_scrap
• Sources:

Aluminium plate input (aluminium_plate_input)

Record purchased aluminium plate crossing the factory boundary when the declared product contains aluminium. The row is not applicable to a wholly iron/steel product; alloy, temper, thickness, supplier, recycled content, and surface state remain product-specific qualifiers.

• Selected flow: Aluminium plate
• Flow property / unit: Mass / kg
• Amount rule: measured accepted aluminium plate mass issued to the product order, net of returned unused stock
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_and_scrap
• Sources:

Forming electricity (forming_electricity)

Record electrical energy used for cutting, rolling, bending, pressing, machining, grinding, and associated local extraction in this process.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value / MJ
• Amount rule: measured process-meter electricity or documented allocation from a shared meter
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_process_energy
• Sources: us-ecfr-40-cfr-63-subpart-xxxxxx

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Segregated steel fabrication scrap (steel_fabrication_scrap)

Record steel offcuts, swarf, and rejected steel pieces leaving the process as one segregated waste stream. Keep aluminium scrap in its separate row and disclose internal return to stock rather than counting it as waste.

• Selected flow: Steel fabrication scrap
• Flow property / unit: Mass / kg
• Amount rule: measured mass transferred from the product order to internal recycling storage or an external waste recipient
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_and_scrap
• Sources:

Segregated aluminium fabrication scrap (aluminium_fabrication_scrap)

Record aluminium offcuts, swarf, and rejected aluminium pieces leaving the process as one segregated waste stream. Keep steel scrap in its separate row and disclose internal return to stock rather than counting it as waste.

• Selected flow: Aluminium fabrication scrap
• Flow property / unit: Mass / kg
• Amount rule: measured mass transferred from the product order to internal recycling storage or an external waste recipient
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_and_scrap
• Sources:

Elementary flows

Process: Welding, joining, and assembly (joining_assembly)

Inputs

Product flows

Flux-cored welding wire (flux_cored_wire)

Record flux-cored wire only when the flux-cored arc welding route is used. Electrode grade and base-metal compatibility shall match the documented weld procedure.

• Selected flow: Flux Cored Wire 1b74a576-06e0-4764-97ce-11a73f8a4752
• Flow property / unit: Mass / kg
• Amount rule: issued mass minus unopened returns, supported by purchasing or weld-shop stock records
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_welding_inputs
• Sources: us-epa-ap42-12-19-welding-1995

Covered welding electrode (covered_welding_electrode)

Record covered welding electrodes only when shielded metal arc welding is used. Do not combine this exchange with wire, flux, or another electrode class.

• Selected flow: Covered welding electrode
• Flow property / unit: Mass / kg
• Amount rule: issued electrode mass minus unopened returns for the product order
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_welding_inputs
• Sources: us-epa-ap42-12-19-welding-1995

Argon shielding gas (welding_argon)

Record gaseous argon only when it crosses the boundary as a separately supplied shielding gas. Carbon dioxide and other gases, when used, shall be added as separate atomic exchanges rather than merged into this row.

• Selected flow: Gaseous argon
• Flow property / unit: Volume / m3
• Amount rule: metered or cylinder-inventory argon consumption at documented reference conditions
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_welding_inputs
• Sources: us-epa-ap42-12-19-welding-1995

Joining electricity (joining_electricity)

Record electricity for welding power sources, positioning, local extraction, and joining-related equipment.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value / MJ
• Amount rule: measured joining-area electricity or documented allocation from a shared meter
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_process_energy
• Sources: us-epa-ap42-12-19-welding-1995

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Elementary flows

Welding PM10 to air (welding_pm10)

Record total PM10 released after the documented capture and control system. Select an elementary-flow UUID only after declaring whether the release is close to ground or through a stack and whether the site is urban or non-urban.

• Selected flow: Welding particles (PM10) to air
• Flow property / unit: Mass / kg
• Amount rule: measured controlled release or a documented facility calculation using electrode consumption, welding process, electrode type, base metal, operating conditions, capture efficiency, and control efficiency
• Value mode: Calculated value (calculated_value)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_welding_emissions
• Sources: us-epa-ap42-12-19-welding-1995

Process: Surface preparation and protective finishing (surface_finishing)

Inputs

Product flows

Finishing electricity (finishing_electricity)

Record electricity used by surface-preparation, bath circulation, ventilation, coating application, and curing equipment when this process is included.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value / MJ
• Amount rule: measured finishing-line electricity or documented allocation from a shared meter
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_process_energy
• Sources: eu-jrc-stm-bref-2006; us-ecfr-40-cfr-63-subpart-xxxxxx

Surface-treatment process water (surface_treatment_water)

Record fresh or purchased process water entering cleaning, rinsing, or aqueous chemical treatment. Internal recirculation is disclosed but is not counted repeatedly as an external input.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass / kg
• Amount rule: measured makeup-water mass entering the included surface-treatment operations
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_surface_finishing
• Sources: eu-jrc-stm-bref-2006

Sodium hydroxide for alkaline cleaning (sodium_hydroxide)

Record sodium hydroxide only when it is purchased and consumed in the declared alkaline cleaning or treatment bath. Report active sodium hydroxide mass and disclose solution concentration and bath-replenishment basis.

• Selected flow: Sodium hydroxide e0abcced-0611-4c24-9290-5a2c5a0c4169
• Flow property / unit: Mass / kg
• Amount rule: calculated active sodium hydroxide mass from measured solution additions and documented concentration
• Value mode: Calculated value (calculated_value)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_surface_finishing
• Sources: eu-jrc-stm-bref-2006

Epoxy coating (epoxy_coating)

Record one formulated epoxy coating product when a factory-applied epoxy system is used. A primer, topcoat, thinner, or curing agent that crosses the boundary separately shall be represented as its own atomic exchange in the completed data package.

• Selected flow: Formulated epoxy coating
• Flow property / unit: Mass / kg
• Amount rule: measured as-supplied coating mass issued to the product order minus documented recoverable return
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_surface_finishing
• Sources: us-ecfr-40-cfr-63-subpart-xxxxxx

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Metal-surface-treatment wastewater (surface_treatment_wastewater)

Record wastewater leaving surface cleaning, rinsing, or aqueous treatment as a characterized waste flow after internal reuse and any on-site treatment. Do not merge it with sanitary sewage or hydrostatic-test drainage.

• Selected flow: Metal-surface-treatment wastewater
• Flow property / unit: Mass / kg
• Amount rule: measured discharged or transferred wastewater mass, with treatment state and receiving boundary declared
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_surface_finishing
• Sources: eu-jrc-stm-bref-2006

Elementary flows

Process: Inspection, testing, draining, and factory release (inspection_dispatch)

Inputs

Product flows

Hydrostatic-test water (hydrotest_water)

Record new process water supplied for a hydrostatic leak or integrity test only when that test is performed. Reused water is tracked in the test record and counted only when it first crosses the foreground boundary.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass / kg
• Amount rule: measured makeup-water mass charged to the test, excluding internally reused water already counted
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_inspection_release
• Sources:

Inspection electricity (inspection_electricity)

Record electricity used by inspection, non-destructive testing, test pumps, draining, and product-release equipment.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value / MJ
• Amount rule: measured inspection-area electricity or documented allocation from a shared meter
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_process_energy
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Finished large metal reservoir, tank, vat, or similar container (finished_tank_output)

Record only conforming finished product released at the manufacturing gate. The product is dry, exceeds 300 L capacity, is not for compressed or liquefied gas, and has no fitted mechanical or thermal equipment.

• Selected flow: Finished large metal reservoir, tank, vat, or similar container
• Flow property / unit: Mass / kg
• Amount rule: measured net mass of conforming finished product released by quality control
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_inspection_release
• Sources: un-cpc-3-0-structure-2025

Waste flows

Drained hydrostatic-test wastewater (hydrotest_wastewater)

Record test water that leaves the foreground system after use and is not internally reused. Declare water quality, any additives, treatment state, and whether it is discharged or transferred.

• Selected flow: Drained hydrostatic-test wastewater
• Flow property / unit: Mass / kg
• Amount rule: measured drained mass leaving the foreground boundary after subtracting documented reuse and retained water
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_inspection_release
• Sources:

Elementary flows

7. Allocation and Co-product Handling

rule_id	applies_to	rule	source_ids
allocation_subdivide_first	shared fabrication and utility systems	Avoid allocation by separately metering or otherwise subdividing product orders, process lines, and utility systems whenever technically feasible.	eu-commission-recommendation-2021-2279
allocation_shared_records	unavoidable shared energy, water, and consumables	When subdivision is not feasible, apply a documented causal driver such as machine time, weld length, treated area, bath loading, or measured product mass; do not default to revenue without demonstrating the absence of a physical driver.	eu-commission-recommendation-2021-2279
allocation_scrap	steel and aluminium scrap	Report measured scrap as a waste output at the point it leaves the foreground process. Do not subtract an avoided-primary-material credit from the foreground inventory; model recycling or treatment consistently in the downstream system and disclose the chosen convention.	eu-commission-recommendation-2021-2279
allocation_nonconforming_products	rework and rejects	Assign rework inputs and unrecovered reject burdens to the production order that generated them when traceable; otherwise use the same documented causal allocation driver as the shared process.	eu-commission-recommendation-2021-2279

8. Foreground Data Collection, Calculation, and Quality Rules

Data Collection Protocols

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_material_and_scrap	material_preparation_forming	metal inputs and segregated scrap outputs	receiving, issue, return, weighbridge, and waste-transfer records	order_id; material; grade/alloy; supplier; batch; gross_mass; returned_mass; scrap_mass; destination	Calibrated scale, stock ledger, and order reconciliation	kg	Each receipt, issue, return, and transfer	At least one representative production year; state shorter campaign coverage	All included production lines and outsourced forming declared	Sum accepted issued mass net of returns and sum segregated scrap by metal; divide by conforming output mass	Calibration records, purchase documents, material certificates, stock reconciliation, waste transfer notes
cp_process_energy	all processes	process electricity	utility meter and production log	meter_id; start_reading; end_reading; unit; process_id; order_id; operating_time; allocation_driver; voltage; grid_or_onsite	Dedicated meter preferred; otherwise reconciled submeter or shared-meter allocation	kWh and MJ	Per batch/order or monthly with production reconciliation	Same representative period as output	All included site operations; outsourced energy excluded from site totals	Convert kWh to MJ and allocate by measured causal driver; divide by conforming output mass	Meter calibration, invoices, interval data, allocation worksheet
cp_welding_inputs	joining_assembly	welding wire, covered electrode, and argon	stores issue/return, cylinder, and welding procedure records	order_id; process_type; consumable_grade; issued_mass; returned_mass; gas_id; gas_volume_or_mass; reference_conditions; weld_length	Weighed issue/return and gas meter or cylinder inventory reconciliation	kg and m3	Each order or shift	Same representative period as output	All included welding cells and declared outsourced joining	Net each atomic consumable separately; convert gas only with documented reference conditions; divide by conforming output mass	Purchase record, weld procedure, material certificate, scale/meter calibration, cylinder reconciliation
cp_welding_emissions	joining_assembly	controlled PM10 release	monitoring or engineering-calculation record	process_type; electrode_type; base_metal; current; voltage; electrode_consumed; capture_efficiency; control_efficiency; measured_PM10; release_compartment	Direct monitoring preferred; otherwise documented approved calculation matched to actual process and controls	kg	Each monitored campaign or calculation period	Representative operating modes in the reporting year	Every included welding release point	Determine post-control PM10 and divide by conforming output mass; no default compartment is assigned	Monitoring report, method detection limits, equipment settings, control inspection, calculation source and uncertainty
cp_surface_finishing	surface_finishing	water, sodium hydroxide, coating, and wastewater	meter, bath-addition, coating issue/return, concentration, and discharge records	order_id; route; treated_area; water_in; water_reused; solution_added; NaOH_concentration; coating_issued; coating_returned; solids_fraction; wastewater_out; treatment_state	Calibrated meters/scales, bath log, supplier formulation, and discharge/transfer measurement	kg and m2	Each batch/order, with bath additions and discharge events	Same representative period as finished output	Every included preparation, bath, coating, curing, and on-site treatment operation	Keep each chemical/coating atomic; calculate active NaOH; subtract only documented internal reuse/returns; divide by output mass	Meter/scale calibration, batch sheet, safety/technical data sheet, bath analysis, wastewater record
cp_inspection_release	inspection_dispatch	test water, test drainage, inspection electricity, and finished product	test sheet, water meter, electricity record, and release certificate	order_id; nominal_capacity; test_method; water_charged; water_reused; water_drained; additives; inspection_energy; dry_product_mass; pass_fail; release_date	Calibrated meters/scales and signed quality-release record	kg, kWh, and MJ	Each finished product or production lot	Full reporting period	All products represented by the dataset	Count only new water input and water leaving the boundary; normalize all accepted records by released dry product mass	Test procedure, meter/scale calibration, inspection result, nonconformance log, release certificate

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
calc_reference_normalization	all inventory rows	normalized amount = period or order amount / conforming dry finished-product mass	atomic flow amount; dry_product_mass	amount per 1 kg finished_tank_output	eu-commission-recommendation-2021-2279
calc_electricity_conversion	electricity rows	electricity_MJ = electricity_kWh × 3.6	metered electricity_kWh	MJ electricity
calc_active_sodium_hydroxide	sodium_hydroxide	active_NaOH_mass = solution_mass × measured mass fraction of NaOH	solution_mass; NaOH_concentration	kg active sodium hydroxide	eu-jrc-stm-bref-2006
calc_welding_pm10	welding_pm10	Use measured post-control PM10; when measurement is unavailable, apply a documented factor valid for the actual process/electrode/base metal/conditions, then multiply by consumed electrode and by (1 − capture efficiency × control efficiency)	measured_PM10 or factor; electrode_consumed; process settings; capture_efficiency; control_efficiency	kg PM10 released to the declared air compartment	us-epa-ap42-12-19-welding-1995
calc_water_reconciliation	surface-treatment and hydrostatic-test water	external wastewater must be reconciled to new water input, retained water, evaporation, off-site transfer, and documented internal reuse without double counting circulation	water_in; water_reused; water_retained; water_evaporated; water_transferred; wastewater_out	reconciled kg water inputs and waste outputs	eu-jrc-stm-bref-2006

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
dq_product_identity	reference product	Verify >300 L capacity, metal type/grade, excluded gas service, absence of fitted mechanical/thermal equipment, dry product mass, finish, integral fittings, and release status for every represented product family.	Drawings, bill of materials, material certificates, inspection and release records; un-cpc-3-0-structure-2025
dq_temporal_geographic	all foreground and upstream data	Foreground records shall cover a representative production period and identify site and geography; upstream datasets shall disclose temporal, geographic, and technological representativeness.	Record-period reconciliation and upstream dataset metadata; eu-commission-recommendation-2021-2279
dq_completeness	all included processes	Reconcile purchasing/issue/return, utility, scrap, wastewater, emission-control, test, reject, and finished-output records; explain exclusions and missing periods.	Mass/energy reconciliation, meter coverage, waste manifests, monitoring reports, nonconformance records
dq_route_specificity	welding and finishing	Preserve actual welding process/electrode/gas, base metal, treated area, chemical concentration, coating formulation, water reuse, and control technology; do not apply generic factors without a documented match and uncertainty.	Weld procedures, supplier data, bath logs, coating technical data, control records; us-epa-ap42-12-19-welding-1995; eu-jrc-stm-bref-2006
dq_instrument_quality	measured foreground data	Retain instrument identity, calibration status, reading resolution, units, missing-data treatment, and responsible reviewer for meters, scales, and emission measurements.	Calibration certificates, raw readings, QA sign-off, and corrective-action records; us-ecfr-40-cfr-63-subpart-xxxxxx

9. Validation Rules

rule_id	applies_to	rule	source_ids
validate_identity	reference product	Fail validation if capacity is not greater than 300 L, compressed/liquefied-gas service is included, mechanical/thermal equipment is fitted, metal construction is not declared, or the output is an unfinished container body.	un-cpc-3-0-structure-2025
validate_reference_mass	reference flow	Require exactly 1 kg net conforming dry finished-product mass as normalization; test water, temporary fixtures, rejected products, and off-site installation items must not be included in the reference mass.
validate_atomic_inventory	process inventory	Require every actual material, electricity, water, gas, coating component, waste stream, and elementary emission to be represented as an atomic exchange; flag merged utilities, merged chemicals, merged waste, or merged emissions.	eu-commission-recommendation-2021-2279
validate_mass_water_records	metal and water balances	Require reconciliation of steel/aluminium input to finished product, segregated scrap, rejects, and stock returns, and reconcile new water to reuse, retained water, loss, transfer, and wastewater. Investigate rather than silently balancing unexplained differences.	eu-jrc-stm-bref-2006
validate_welding_emissions	welding_pm10	Require actual welding process, electrode, base metal, operating conditions, capture/control, calculation or monitoring method, and release compartment; fail UUID completeness when the selected elementary-flow compartment does not match the declared release.	us-epa-ap42-12-19-welding-1995; us-ecfr-40-cfr-63-subpart-xxxxxx
validate_allocation	shared processes and scrap	Require subdivision or a documented causal allocation driver, consistent scrap recycling convention, and sensitivity disclosure where allocation materially affects results.	eu-commission-recommendation-2021-2279
validate_unresolved_identity	UUID-empty rows	Treat every UUID-empty row listed in manifest review metadata as unresolved; do not promote a generic, proxy, wrong-property, wrong-compartment, or wrong-product-state candidate.

10. Published Dataset Profile

Field	Value
dataset_role	Foreground product-manufacturing dataset for one declared large passive metal container product or a documented representative product family
downstream_use	secondary_dataset; background_dataset after methodology review, UUID closure, upstream-link review, and external range-evidence review appropriate to the intended database
allowed_use	Factory-gate product comparisons and lifecycle models where the product identity, material route, capacity, finishing route, geography, production period, allocation, and linked upstream datasets are compatible
excluded_use	Pressure-gas containers; containers ≤300 L; equipped tanks; use-stage storage service; installation; end-of-life; comparisons that ignore capacity, material grade, finish, service conditions, or unresolved UUIDs
required_metadata	PCR id and version when published; product drawing/BOM identity; metal/alloy and recycled content; capacity; dry mass; wall thickness; finish/lining; integral fittings; test method; process routes; site/geography; reporting period; upstream datasets; allocation; cut-offs; data owner; review status
required_quality_disclosure	Meter and scale coverage; representativeness; shared-meter allocation; supplier-data gaps; mass/water reconciliation; welding-emission method and compartment; surface-treatment route; wastewater state; scrap treatment convention; uncertainty; unresolved UUID and range-evidence needs
update_trigger	Material/alloy or capacity-family change; new forming/joining/finishing technology; coating/lining change; major supplier or electricity mix change; altered test-water reuse or emission controls; site/geography change; allocation change; material inventory revision; UUID resolution; or new two-source compatible range evidence

11. Data Sources

Source id	Type	Reference	Used for
un-cpc-3-0-structure-2025	official_guidance	United Nations Statistics Division, CPC Ver. 3.0 Structure, 30 June 2025, row 42210. https://unstats.un.org/unsd/classifications/Econ/Download/In%20Text/CPC_Ver_3.0_Structure_30Jun2025.csv (retrieved 2026-09-05; retained bytes verified as SHA-256 5cd2c1c4890dd6be16af48e9bb940fed48efff9865f39ff15edaa921da25fb7c)	Official product identity, material scope, >300 L threshold, and exclusions
us-ecfr-40-cfr-63-subpart-xxxxxx	standard	U.S. Environmental Protection Agency, 40 CFR Part 63, Subpart XXXXXX, National Emission Standards for Hazardous Air Pollutants Area Source Standards for Nine Metal Fabrication and Finishing Source Categories. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-63/subpart-XXXXXX (retrieved 2026-09-05)	Fabricated-plate-work operations, machining, grinding/polishing, welding, spray-painting preparation/application/curing/cleaning, particulate controls, and records
us-epa-ap42-12-19-welding-1995	method_factor	U.S. Environmental Protection Agency, AP-42 Section 12.19 Electric Arc Welding, January 1995. https://www.epa.gov/sites/default/files/2020-11/documents/c12s19.pdf (retrieved 2026-09-05)	Welding process decomposition, electrode and shielding-gas dependence, PM10 identity, calculation inputs, controls, and uncertainty disclosure; no default factor or range is adopted
eu-jrc-stm-bref-2006	official_guidance	European Commission, Joint Research Centre, Reference Document on Best Available Techniques for the Surface Treatment of Metals and Plastics, August 2006. https://bureau-industrial-transformation.jrc.ec.europa.eu/sites/default/files/2019-11/stm_bref_0806.pdf (retrieved 2026-09-05)	Conditional aqueous chemical/electrolytic surface-treatment decomposition, water-based processing, corrosion-protection purpose, associated activities, and environmental records; no external range is adopted
eu-commission-recommendation-2021-2279	official_guidance	European Commission, Recommendation (EU) 2021/2279 of 15 December 2021 on the use of the Environmental Footprint methods, corrected 23 May 2022. https://eur-lex.europa.eu/eli/reco/2021/2279/corrigendum/2022-05-23/oj/eng (retrieved 2026-09-05)	Subdivision/allocation hierarchy, inventory normalization, data quality, consistency, completeness, representativeness, and model disclosure