Scrapers, self-propelled

1. Scope and Applicability

This PCR covers a new, accepted, complete self-propelled scraper at the factory gate. The machine integrates its own traction and a scraper bowl for cutting, loading, carrying and discharging earth or similar mineral material. Record the actual tractor/scraper configuration, installed engine count, bowl type and acceptance fill state. The Caterpillar 657 brochure demonstrates a wheel tractor-scraper with tractor and scraper engines, a bowl, tires and hydraulic systems; it is an example of the boundary, not a category-wide bill of materials or mass value (cat-657-2020).

This is a cradle-to-factory-gate foreground data rule. It includes purchased material and component upstream datasets, on-site fabrication when performed, final assembly, and fuel and emissions from factory testing. It excludes distribution, operation at the customer's jobsite, maintenance and end of life. Such later stages require separately declared scenarios if a full-life-cycle result is prepared (ec-pef-method-2021). The United Nations CPC 3.0 structure lists self-propelled scrapers separately from dozers, graders, rollers, loaders, excavators and off-highway dumpers (un-cpc-3-2025).

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.special-purpose-machinery.scrapers-self-propelled
classification_refs	CPC 3.0: 44423, Scrapers, self-propelled (un-cpc-3-2025)
covered_products	Complete new self-propelled wheel tractor-scrapers with an integral scraping/loading bowl, including disclosed single- or twin-engine configurations.
excluded_products	Towed scrapers; graders; dozers; excavators; front-end loaders; dumpers; detachable blades or bowls sold separately; component-only assemblies; used or refurbished machines.
representative_product	One accepted complete self-propelled scraper with declared bowl and propulsion configuration (cat-657-2020).
production_route	Purchased components, conditional on-site steel fabrication, final assembly, and factory functional testing.
market_state	New complete machine accepted at the factory gate, without transport packaging.

3. Reference Flow

Field	Value
What	Provide an accepted self-propelled machine able to scrape/load, carry and discharge earth or mineral material.
How much	One complete machine of the declared configuration; its measured accepted net mass is M kg.
How well	Record rated bowl capacity, payload or cut width, installed engine count and applicable acceptance test; no common performance value is imposed (cat-657-2020).
How long or cycle	One factory-gate delivery; service life and operating duty cycle are outside this declared result.
reference_flow_link	finished_scraper

Field	Value
Reference amount	M
Reference product flow	Scrapers, self-propelled 42b7c34e-7d9d-4e3f-845b-0cd920105c35
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	model; serial number; bowl and propulsion configuration; installed engine and tire count; acceptance fill state; factory location and period; measured net mass M

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_mass	reference product	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	M = accepted net mass of one complete machine of the same configuration in kg; collect using cp_mass.

The mass record excludes shipping packaging, operator and test payload, and records the fuel and service-fluid fill state. A brochure operating weight that includes full fuel is not a universal accepted net mass (cat-657-2020). Every input and waste exchange is collected per one accepted finished scraper of the same configuration; do not substitute an unmeasured catalog weight.

5. System Boundary

Boundary Abstraction

Field	Value
declared_starting_condition	Purchased steel and discrete machine components enter the reporting production site; declare whether the steel bowl is made on site or purchased.
starting_condition_role	Physical starting condition for the foreground manufacturing boundary.
product_classification_scope	Finished self-propelled scraper as CPC 44423; upstream parts keep their own product identities.
recursive_input_rule	A purchased complete scraper entering for finishing remains a separately disclosed input; do not recursively replace it with this PCR's own output.
upstream_dataset_requirement	Link each purchased material/component and fuel to a suitable upstream dataset with matching material, technology, geography and product state.
disclosure	Report site, period, configuration, purchased-versus-fabricated bowl route, included tests, excluded stages and upstream data gaps.

rule_id	Applies to	Rule	source_ids
boundary_factory_gate	manufacturing boundary	Include manufacturing and assembly from component entry through accepted finished machine leaving the site; include manufacturing waste and internal movements where material (ec-pef-method-2021).	ec-pef-method-2021
boundary_route	fabrication route	Include on-site cutting, forming and welding only when performed; otherwise record the purchased fabricated bowl as its own upstream product. Do not count both paths for the same bowl (epa-clean-lines-metal-fabrication-2007; cat-657-2020).	epa-clean-lines-metal-fabrication-2007; cat-657-2020
boundary_test	factory test	Include fuel and direct exhaust from factory tests before acceptance; exclude customer use and downstream stages (ec-pef-method-2021).	ec-pef-method-2021

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
fabrication	On-site steel fabrication	conditional	Include when steel cutting, forming or welding of scraper structural parts occurs at the reporting site.	Foreground fabrication and scrap generation.	per one accepted finished scraper
assembly_test	Final assembly and factory test	required	All covered machines undergo final assembly and acceptance; include actual factory test route.	Foreground assembly, installed components, fuels, direct test emissions and finished output.	per one accepted finished scraper

Process: On-site steel fabrication (fabrication)

Inputs

Product flows

Steel plate entering cutting and forming (plate)

When steel structural parts are cut or formed on site; otherwise record the purchased fabricated bowl at assembly.

• Selected flow: Hot-rolled carbon steel plate (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Collect the actual kg exchange per one accepted finished scraper using cp_material.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per one accepted finished machine
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material
• Sources: epa-clean-lines-metal-fabrication-2007

Steel welding wire consumed in fabrication (wire)

When arc welding is performed on site.

• Selected flow: Steel welding wire (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Collect the actual kg exchange per one accepted finished scraper using cp_material.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per one accepted finished machine
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material
• Sources: epa-clean-lines-metal-fabrication-2007

Grid electricity for metal fabrication (power)

When fabrication is performed on site; include metered cutting, forming and welding electricity.

• Selected flow: Grid electricity, medium voltage (UUID unresolved)
• Flow property / unit: Energy / kWh
• Amount rule: Collect the actual kWh exchange per one accepted finished scraper using cp_energy.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per one accepted finished machine
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_energy
• Sources: ec-pef-method-2021

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Carbon steel cutting scrap leaving fabrication (scrap)

When carbon steel offcuts or swarf leave the fabrication process; report their documented destination.

• Selected flow: Carbon steel cutting scrap (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Collect the actual kg exchange per one accepted finished scraper using cp_waste.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per one accepted finished machine
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_waste
• Sources: epa-clean-lines-metal-fabrication-2007

Elementary flows

Process: Final assembly and factory test (assembly_test)

Inputs

Product flows

Purchased fabricated scraper bowl entering assembly (purchased_bowl)

Only when the bowl is purchased as a complete fabricated component; exclude the same bowl from on-site plate and welding inputs.

• Selected flow: Fabricated steel scraper bowl (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Collect the actual kg exchange per one accepted finished scraper using cp_components.
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per one accepted finished machine
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_components
• Sources: cat-657-2020

Diesel engine installed in the scraper (engine)

For each installed engine; record actual engine count and mass for the accepted configuration, including twin-engine variants.

• Selected flow: Diesel engine d3ac8612-80b9-4283-9439-62aa4986fce2
• Flow property / unit: Number of items / Item(s)
• Amount rule: Record the installed diesel engine count per one accepted finished scraper using cp_engine_count.
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per one accepted finished machine
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_engine_count
• Sources: cat-657-2020

Pneumatic off-road tire installed (tire)

For each installed tire in a wheeled scraper configuration; record actual tire count and mass.

• Selected flow: Pneumatic off-road rubber tire (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Collect the actual kg exchange per one accepted finished scraper using cp_components.
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per one accepted finished machine
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_components
• Sources: cat-657-2020

Hydraulic oil charged into accepted machine (hydraulic_oil)

Only for a mineral-oil hydraulic system and the acceptance fill; another actual fluid requires its own identified row.

• Selected flow: Hydraulic Fluid eafff56c-3487-4345-9f24-00429f61c556
• Flow property / unit: Mass / kg
• Amount rule: Collect the actual kg exchange per one accepted finished scraper using cp_fluids.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per one accepted finished machine
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_fluids
• Sources: cat-657-2020

Diesel consumed in factory functional test (test_diesel)

When the installed diesel engine is run before factory gate; count fuel actually combusted in tests, not retained acceptance fill, and record the actual fuel grade.

• Selected flow: Diesel fuel 9d258d75-6792-4f1c-9856-81602ed8f816
• Flow property / unit: Mass / kg
• Amount rule: Collect the actual kg exchange per one accepted finished scraper using cp_test_fuel.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per one accepted finished machine
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_test_fuel
• Sources: cat-657-2020

Waste flows

Elementary flows

Outputs

Product flows

Accepted complete self-propelled scraper (finished_scraper)

Exactly one accepted complete machine of the declared configuration; amount is measured net mass M kg.

• Selected flow: Scrapers, self-propelled 42b7c34e-7d9d-4e3f-845b-0cd920105c35
• Flow property / unit: Mass / kg
• Amount rule: M kg
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per one accepted finished machine
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_mass
• Sources: un-cpc-3-2025; cat-657-2020

Waste flows

Elementary flows

Fossil carbon dioxide from factory diesel test (test_co2)

When diesel is combusted in on-site testing; use measured exhaust or a documented fuel carbon-balance calculation in the data package.

• Selected flow: carbon dioxide (fossil) 08a91e70-3ddc-11dd-923d-0050c2490048
• Flow property / unit: Mass / kg
• Amount rule: Collect the actual kg exchange per one accepted finished scraper using cp_test_emission.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per one accepted finished machine
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_test_emission
• Sources: ec-pef-method-2021

7. Allocation and Co-product Handling

rule_id	Applies to	Rule	source_ids
alloc_subdivide	shared fabrication or assembly lines	First separate directly metered processes and batches; assign measured material, electricity, fuel, scrap and emission records to the represented machine/configuration where possible.	ec-pef-method-2021
alloc_shared	unavoidable common site inputs	If subdivision is impossible, use a documented causal physical driver such as metered process hours or component mass; disclose the driver, denominators and sensitivity.	ec-pef-method-2021
alloc_scrap	steel scrap	Record carbon steel cutting scrap and its real destination separately; do not silently subtract sale receipts or assumed recycling credits from gross material input.	epa-clean-lines-metal-fabrication-2007; ec-pef-method-2021

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_mass	assembly_test	accepted machine mass	calibrated weighing and acceptance record	model; configuration; serial number; accepted net mass M; fuel and fluid fill state	Weigh the accepted complete machine on a calibrated scale, excluding transport packaging; reconcile the same configuration and acceptance record.	kg	each accepted machine	declared production period	reporting site	accepted net mass per machine	calibration and signed acceptance record
cp_material	fabrication	plate and wire input	issue, purchase and return records	material grade; kg issued; kg returned; machine or batch id	Reconcile material issues and returns to the actual scraper structural fabrication batch.	kg	each fabrication batch	declared production period	reporting site	per one accepted finished machine	stock ledger and batch traveler
cp_energy	fabrication	grid electricity	submeter and production log	kWh; meter id; machine hours; configuration	Read submeter for fabrication; if shared, apply the disclosed physical allocation driver.	kWh	each batch or shift	declared production period	reporting site	per one accepted finished machine	meter and allocation record
cp_waste	fabrication	carbon steel scrap	weighed waste dispatch	kg; grade; destination; batch id	Weigh carbon steel offcuts and swarf separately from non-steel waste; record destination.	kg	each dispatch	declared production period	reporting site	per one accepted finished machine	weigh ticket and transfer record
cp_components	assembly_test	installed components	bill of materials and supplier receipt	component identity; installed count; net kg; serial number	Reconcile actual installed bowl and tires to the accepted configuration and supplier receipts.	kg	each accepted machine	declared production period	reporting site	per one accepted finished machine	bill of materials and receipt
cp_engine_count	assembly_test	installed diesel engine count	engine serial and assembly record	engine model; serial number; installed count; net kg for reconciliation	Count the diesel engines actually installed in the accepted machine and reconcile purchase and assembly records.	Item(s)	each accepted machine	declared production period	reporting site	per one accepted finished machine	engine receipt and signed assembly record
cp_fluids	assembly_test	hydraulic oil charge	fill and inventory log	oil grade; kg dispensed; kg recovered; fill state	Reconcile oil dispensed into the accepted hydraulic system with recovered or drained oil.	kg	each accepted machine	declared production period	reporting site	per one accepted finished machine	fill log and purchase specification
cp_test_fuel	assembly_test	diesel combusted in test	fuel meter and test log	kg before; kg after; fuel grade; test id	Measure diesel actually combusted in factory test, separating fuel retained at acceptance.	kg	each factory test	declared production period	reporting site	per one accepted finished machine	calibrated meter and test report
cp_test_emission	assembly_test	fossil CO2 to air	exhaust measurement or carbon-balance worksheet	measured kg CO2 or fuel kg and documented carbon factor; test id	Use measured test exhaust when available; otherwise calculate from the recorded fuel carbon balance and disclose factors in the data package.	kg	each factory test	declared production period	reporting site	per one accepted finished machine	measurement report or auditable balance

Calculation Rules

No numerical machine mass or cross-product average is supplied by this PCR. Dataset producers may calculate site-specific allocations from the protocols above, preserving the per-machine denominator and documenting each physical driver.

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
dq_configuration	reference and components	Match model, serial number, bowl route, engines, tires and fill state across M and all inventory rows.	acceptance record and bill of materials
dq_temporal	all foreground flows	Use the declared production period and site, and identify any noncontemporaneous supplier data.	dated records and supplier metadata (ec-pef-method-2021)
dq_mass_balance	material and waste	Reconcile steel issued, steel retained in the machine and separately weighed steel scrap; explain unresolved differences.	stock ledger, bill of materials and weigh tickets (epa-clean-lines-metal-fabrication-2007)
dq_no_default_weight	reference mass	Do not replace measured M with a model brochure operating weight or a different fill state.	calibrated weighing record (cat-657-2020)

9. Validation Rules

rule_id	Applies to	Rule	source_ids
val_identity	reference product	Require the finished scraper UUID, exact machine configuration and measured M kg to agree with the accepted machine; no component-only flow may replace the output.	un-cpc-3-2025; cat-657-2020
val_basis	all inventory rows	Require one accepted finished scraper as the denominator for every material, energy, waste and test emission amount; test fuel and retained fuel are separate.	ec-pef-method-2021
val_route	fabrication and purchased bowl	Require route evidence and prohibit counting the same bowl through both on-site steel fabrication and a purchased complete bowl.	epa-clean-lines-metal-fabrication-2007; cat-657-2020
val_gaps	unresolved identity and ranges	Disclose unresolved flow UUIDs and missing independent range evidence; do not substitute proxy UUIDs or model-specific brochure values.	ec-pef-method-2021

10. Published Dataset Profile

Field	Value
dataset_role	Primary foreground data package for manufacturing one accepted new self-propelled scraper.
downstream_use	Publish verified process and lifecyclemodel projections; may serve as a secondary or background dataset after review.
allowed_use	Cradle-to-factory-gate comparison only when configuration, boundary, mass and data quality are harmonized.
excluded_use	Unqualified service-life, earthmoving productivity, or operational fuel comparison.
required_metadata	model; serial/configuration; site; period; M and fill state; bowl route; test route; allocation drivers; upstream datasets
required_quality_disclosure	measured and estimated records; source geography/technology; missing UUIDs; unresolved empirical ranges; mass-balance residuals; exclusions
update_trigger	changed machine configuration, site route, component supply, fuel/energy mix or material foreground records

11. Data Sources

Source id	Type	Reference	Used for
un-cpc-3-2025	official_guidance	CPC Version 3.0 Structure, 30 June 2025, https://unstats.un.org/unsd/classifications/Econ/Download/In%20Text/CPC_Ver_3.0_Structure_30Jun2025.csv (retrieved 2026-09-26)	official classification identity only
cat-657-2020	handbook	657 WHEEL TRACTOR-SCRAPER, Caterpillar AEXQ2604-00, https://s7d2.scene7.com/is/content/Caterpillar/CM20200825-44b60-322ae (retrieved 2026-09-26)	complete-machine boundary, components and model-specific weight caveat
epa-clean-lines-metal-fabrication-2007	official_guidance	Clean Lines: Strategies for Reducing Your Environmental Footprint — Metal Fabrication Operations, U.S. EPA, https://www.epa.gov/sites/default/files/2015-03/documents/fabrication.pdf (retrieved 2026-09-26)	cutting/welding process and scrap/fluid inventory
ec-pef-method-2021	official_guidance	Annex I. Product Environmental Footprint Method, European Commission 2021, https://environment.ec.europa.eu/system/files/2021-12/Annexes%201%20to%202.pdf (retrieved 2026-09-26)	functional reference, stage boundary, allocation hierarchy and primary-data collection