exported
equivalent
accumulator
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Accumulator
Generated on 2026-04-15
Natural Language Definition
EN
An accumulator is a vessel that has the designed function to accumulate (store and controllably release) energy or matter.
PT-BR
Um acumulador é um vaso que tem a função projetada de acumular (armazenar e liberar de forma controlada) energia ou matéria.
Formal Axioms
Semi-formal (Aristotelian)
Every accumulator is a vessel that bears an accumulation function
First-Order Logic Theory
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▸ Stored override
∀x (Accumulator(x) ↔ (Vessel(x) ∧ ∃f (AccumulationFunction(f) ∧ bearerOf(x,f))))
OWL 2 / Turtle
@prefix copi: <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix : <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix bfo: <http://purl.obolibrary.org/obo/> .
@prefix iof-core: <https://spec.industrialontologies.org/ontology/construct/> .
@prefix iof-av: <https://spec.industrialontologies.org/ontology/annotation/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix apv: <http://inf.ufrgs.br/ontologies/apv#> .
### COPI — Core Ontology for Petroleum Installations
### Class module: Accumulator
<https://www.inf.ufrgs.br/ontologies/copi>
rdf:type owl:Ontology ;
dcterms:title "Core Ontology for Petroleum Installations (COPI)"@en ;
dcterms:title "Ontologia Core para Instalações de Petróleo (COPI)"@pt-br ;
dcterms:description "BFO/IOF-Core conformant ontology of equipment classes for petroleum production plants, developed using the five-step RDL enrichment method."@en ;
skos:scopeNote "Material artifacts (bfo:material_entity) that (i) are part of a petroleum production plant, and (ii) bear at least one function whose realization involves the transport (e.g. production and injection), processing (separation and other processes), control, monitoring, measurement, containment or offloading of material or energy."@en ;
skos:scopeNote "Artefatos materiais (bfo:material_entity) que (i) fazem parte de uma planta de produção de petróleo, e (ii) possuem ao menos uma função cuja realização envolve o transporte (p. ex. produção e injeção), processamento (separação e outros processos), controle, monitoramento, medição, contenção ou escoamento de material ou energia."@pt-br ;
skos:scopeNote "COPI provides high-level equipment categories defined by function to demonstrate the defined-class mechanism. Equipment subtypes are annotated with references to CFIHOS and PCA RDL terms. COPI is not a reference data library; organizations should use CFIHOS, PCA RDL, or ISO 14224 for comprehensive equipment classification."@en ;
skos:scopeNote "COPI fornece categorias de alto nível de equipamentos definidas por função para demonstrar o mecanismo de classe definida. Os subtipos de equipamentos são anotados com referências aos termos do CFIHOS e do PCA RDL. COPI não é uma biblioteca de dados de referência; organizações devem utilizar o CFIHOS, o PCA RDL ou a ISO 14224 para classificação abrangente de equipamentos."@pt-br ;
owl:versionInfo "1.1.0" ;
owl:imports <https://spec.industrialontologies.org/ontology/core/Core/> ;
owl:imports <http://purl.obolibrary.org/obo/bfo/2020/bfo.owl> ;
dcterms:creator "Nicolau Oyhenard dos Santos"@en ;
dcterms:contributor "Cauã Antunes" ;
dcterms:contributor "Haroldo Rojas" ;
dcterms:contributor "Rafael Petry" ;
dcterms:contributor "Régis Romeu" ;
dcterms:contributor "Mara Abel" ;
dcterms:isPartOf <https://inf.ufrgs.br/projetos/OntoKG> ;
dcterms:publisher "Universidade Federal do Rio Grande do Sul (UFRGS)"@en ;
dcterms:license <https://creativecommons.org/licenses/by/4.0/> ;
dcterms:created "2026-04-08"^^xsd:date ;
dcterms:modified "2026-10-08"^^xsd:date ;
apv:GlobalMinLanguageCoverage "en pt-br" ;
apv:ClassURIFormationRule "https://www[.]inf[.]ufrgs[.]br/ontologies/copi/(COPI_[0-9]{7}|[A-Z][A-Za-z0-9]*)" ;
apv:ClassMinAnnotationCoverage "rdfs:label https://spec.industrialontologies.org/ontology/annotation/naturalLanguageDefinition" .
iof-av:naturalLanguageDefinition rdf:type owl:AnnotationProperty ;
apv:MinAnnotationLength 20 .
### Identity-giving function
:COPI_0000405 rdf:type owl:Class ; # AccumulationFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000406 # AccumulationProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000406 # AccumulationProcess
] ;
rdfs:label "accumulation function"@en ;
rdfs:label "função de acumulação"@pt-br .
### Process type
:COPI_0000406 rdf:type owl:Class ; # AccumulationProcess
rdfs:subClassOf :COPI_0000009 ; # MaterialContainment
rdfs:label "accumulation process"@en ;
rdfs:label "processo de acumulação"@pt-br .
:COPI_0000009 rdf:type owl:Class . # MaterialContainment
:COPI_0000406 # AccumulationProcess
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasInput ;
owl:someValuesFrom :COPI_0000037 # PortionOfFluid
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom :COPI_0000037 # PortionOfFluid
] .
### Equipment universal: Accumulator
:COPI_0000206 rdf:type owl:Class ; # Accumulator
owl:equivalentClass [
rdf:type owl:Class ;
owl:intersectionOf (
:COPI_0000158 # Vessel
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000405 # AccumulationFunction
]
)
] ;
rdfs:label "accumulator"@en ;
rdfs:label "acumulador"@pt-br ;
iof-av:naturalLanguageDefinition "An accumulator is a vessel that has the designed function to accumulate (store and controllably release) energy or matter."@en ;
skos:definition "An accumulator is a vessel that has the designed function to accumulate (store and controllably release) energy or matter."@en ;
iof-av:naturalLanguageDefinition "Um acumulador é um vaso que tem a função projetada de acumular (armazenar e liberar de forma controlada) energia ou matéria."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every accumulator is a vessel that bears an accumulation function"@en ;
iof-av:firstOrderLogicAxiom "∀x (Accumulator(x) ↔ (Vessel(x) ∧ ∃f (AccumulationFunction(f) ∧ bearerOf(x,f))))"@en ;
skos:definition "[ISO 15926-4] An <ACCUMULATOR> is a <FunctionalObject> that has a capability of <ACCUMULATING> matter and/or energy"@en ;
skos:definition "[CFIHOS] A physical object for storing energy, and which after discharge may be recharged."@en ;
skos:definition "[SLB Glossary] A device used in a hydraulic system to store energy or, in some applications, dampen pressure fluctuations."@en ;
skos:definition "[OnePetro] In context of a pressure control device, accumulators are canisters of hydraulic fluid, pressurized with a nitrogen gas cap of sufficient pressure and volume to operate all the rams on a BOP in case of power failure to the BOP. In context of a processing plant, an accumulator is a vessel that receives and temporarily stores a liquid used in the feed stock or the processing of a feed stream in a gas plant or other processing facility."@en ;
skos:definition "[POSC Caesar] A functional object capable of storing energy, and which after discharge may be recharged."@en .
# Disjointness: Accumulator and HeatExchanger
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000206 :COPI_0000092 ) . # Accumulator, HeatExchanger
# Disjointness: Accumulator and Pump
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000206 :COPI_0000072 ) . # Accumulator, Pump
# Disjointness: Accumulator and Compressor
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000206 :COPI_0000073 ) . # Accumulator, Compressor
# Disjointness: Accumulator and Turbine
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000206 :COPI_0000366 ) . # Accumulator, Turbine
Axiomatization Decision Log
1
Identity-Giving Function
Function class
AccumulationFunction
⊑ DesignedFunction
Realized in
AccumulationProcess
⊑ MaterialContainment
The identity-giving function is the capability to accumulate (store and later release) energy or matter. This is the common thread across all definitions: ISO 15926's 'capability of accumulating matter and/or energy', CFIHOS's 'storing energy', SLB's 'store energy', and OnePetro's contexts of storing hydraulic energy or temporarily storing liquids. This function distinguishes accumulators from other storage devices by emphasizing the accumulation process (gradual buildup and controlled release).
2
Genus Determination
Vessel
Among the parent candidates, 'vessel' (from CFIHOS) is the most specific and ontologically appropriate genus. Accumulators are fundamentally containment vessels designed for storage/accumulation functions. The ISO 15926 'FunctionalObject' and POSC 'Artefact' are too broad. 'Vessel' is already enriched in our ontology with ContainmentFunction, making it the ideal genus. Accumulators inherit the basic containment capability but add the specific accumulation/energy storage differentia.
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
These are the minimal parts required for any accumulator regardless of subtype. The specific nature of the storage mechanism varies (gas bladder, piston, spring, chemical cells, etc.) but some energy storage mechanism is always present.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
PortionOfFluid
— optional, for fluid-based accumulators
Outputs (O)
PortionOfFluid
— if fluid input, then fluid output at potentially different pressure
Transformation (T)
energy storage and controlled release - no energy conversion, but temporal and potentially pressure/voltage buffering
Accumulators perform energy accumulation and release without fundamental energy conversion. The signature varies by accumulator type but always involves energy input during charging, storage, and energy output during discharge. Fluid may or may not be involved depending on the accumulator type.
5
Axiom Mode Decision
Necessary + Sufficient
— modelled as a defined class
(≡, EquivalentClass). Automatic classification is
appropriate for this concept.
Disjointness Axioms
HeatExchanger
Pump
Compressor
Turbine
C?: HeatExchanger [kind_ambiguous]. C?: Pump [kind_ambiguous]. C?: Compressor [kind_ambiguous]. C?: Turbine [kind_ambiguous]. Accumulators store and release energy without conversion between energy types, while heat exchangers convert between thermal and fluid energy, pumps/compressors add energy to fluids, and turbines extract energy from fluids. The signatures are incompatible in terms of transformation type.
Cross-Standard Observations
Strong consistency across standards in defining accumulators by their energy/matter storage and accumulation function. OnePetro provides useful domain-specific contexts (BOP hydraulics, process plant vessels) while maintaining the core functional identity. Subtypes show clear constructive differentia (bladder, piston, diaphragm, spring-loaded) overlaying the functional base.
