exported
necessary
flexible riser
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Flexibleriser
Generated on 2026-04-16
Natural Language Definition
EN
A flexible riser is a riser that has flexible material construction allowing vertical or near-vertical fluid conduction between seabed and surface while accommodating vessel movement.
PT-BR
Um riser flexível é um riser que possui construção de material flexível permitindo condução de fluido vertical ou quase vertical entre o fundo do mar e a superfície, acomodando o movimento da embarcação.
Formal Axioms
Semi-formal (Aristotelian)
Every flexible riser is a riser that has a flexible property
First-Order Logic Theory
Loading…
▸ Stored override
∀x(FlexibleRiser(x) → Riser(x) ∧ ∃q(FlexibleProperty(q) ∧ hasQuality(x,q)))
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: FlexibleRiser
<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_0000529 rdf:type owl:Class ; # FluidConductionFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000530 # FluidConductionProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000530 # FluidConductionProcess
] ;
rdfs:label "fluid conduction function"@en ;
rdfs:label "função de condução de fluido"@pt-br .
### Process type
:COPI_0000530 rdf:type owl:Class ; # FluidConductionProcess
rdfs:subClassOf :COPI_0000003 ; # MomentumTransfer
rdfs:label "fluid conduction process"@en ;
rdfs:label "processo de condução de fluido"@pt-br .
:COPI_0000003 rdf:type owl:Class . # MomentumTransfer
:COPI_0000530 # FluidConductionProcess
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: FlexibleRiser
:COPI_0000277 rdf:type owl:Class ; # FlexibleRiser
rdfs:subClassOf :COPI_0000339 ; # Riser
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000529 # FluidConductionFunction
] ;
rdfs:label "flexible riser"@en ;
rdfs:label "riser flexível"@pt-br ;
iof-av:naturalLanguageDefinition "A flexible riser is a riser that has flexible material construction allowing vertical or near-vertical fluid conduction between seabed and surface while accommodating vessel movement."@en ;
skos:definition "A flexible riser is a riser that has flexible material construction allowing vertical or near-vertical fluid conduction between seabed and surface while accommodating vessel movement."@en ;
iof-av:naturalLanguageDefinition "Um riser flexível é um riser que possui construção de material flexível permitindo condução de fluido vertical ou quase vertical entre o fundo do mar e a superfície, acomodando o movimento da embarcação."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every flexible riser is a riser that has a flexible property"@en ;
iof-av:firstOrderLogicAxiom "∀x(FlexibleRiser(x) → Riser(x) ∧ ∃q(FlexibleProperty(q) ∧ hasQuality(x,q)))"@en ;
iof-av:isPrimitive "true"^^xsd:boolean ;
iof-av:primitiveRationale "Constructive type where flexibility is a material/structural property. Under OWA, asserting equivalence would force any pipe with flexible qualities to be classified as a flexible riser, even if it serves different functions or has different deployment contexts. Starting with necessary conditions protects against false positives."@en ;
skos:definition "[ISO 15926-4] A <FLEXIBLE RISER> is an <ARTEFACT> and a <RISER> that is a flexible vertical or near vertical pipe for the flow of liquid or gas between the seabed and the surface"@en ;
skos:definition "[CFIHOS] A flexible vertical or near vertical pipe for the flow of liquid or gas between the seabed and the surface."@en .
Axiomatization Decision Log
1
Identity-Giving Function
Function class
FluidConductionFunction
⊑ DesignedFunction
Realized in
FluidConductionProcess
⊑ MomentumTransfer
Reusing the same function as the parent class 'riser' since flexible riser performs the same core fluid conduction function. The flexibility is a structural differentia, not a functional one.
2
Genus Determination
Riser
From parent_candidates, 'riser' is already enriched and is the most specific appropriate superclass. Flexible riser is a subtype of riser distinguished by its flexible construction. ARTEFACT is too broad.
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
Flexible risers require a flexible pipe body as their distinguishing structural component, plus the basic fluid-conducting bore common to all risers.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
PortionOfFluid
— liquid or gas from seabed
Outputs (O)
PortionOfFluid
— same fluid delivered to surface
Transformation (T)
spatial transport with accommodation of vessel movement
Same process signature as parent riser class - single fluid stream transported vertically from seabed to surface, with added capability for dynamic positioning accommodation.
5
Axiom Mode Decision
Necessary conditions only
— modelled as a primitive universal
(⊑, SubClassOf). Identity is grounded in designed
function and cannot be reduced to a property checklist.
Constructive type where flexibility is a material/structural property. Under OWA, asserting equivalence would force any pipe with flexible qualities to be classified as a flexible riser, even if it serves different functions or has different deployment contexts. Starting with necessary conditions protects against false positives.
Cross-Standard Observations
Both ISO 15926 and CFIHOS provide consistent definitions focusing on the flexible vertical pipe between seabed and surface. The extensive CFIHOS properties list indicates this is a well-established equipment category with specific operational characteristics for offshore fluid production systems.
