validated
equivalent
blind flange
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Blindflange
Generated on 2026-09-08
Natural Language Definition
EN
A blind flange is a flange that bears a pipe-end closure function: a solid plate with no central opening, bolted over a flanged pipe end to seal it off, rather than to connect it to another component.
PT-BR
Um flange cego e um flange que possui uma funcao de fechamento de extremidade de tubo: uma placa solida sem abertura central, aparafusada sobre uma extremidade de tubo flangeada para veda-la, em vez de conecta-la a outro componente.
Formal Axioms
Semi-formal (Aristotelian)
Every blind flange is a flange that bears a pipe-end closure function and has a solid plate form quality, and conversely.
First-Order Logic Theory
Loading…
▸ Stored override
∀x (BlindFlange(x) ↔ Flange(x) ∧ ∃f (PipeEndClosureFunction(f) ∧ bearerOf(x,f)) ∧ ∃q (SolidPlateForm(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: BlindFlange
<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_0000763 rdf:type owl:Class ; # PipeEndClosureFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000764 # PipeEndClosureProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000764 # PipeEndClosureProcess
] ;
rdfs:label "pipe end closure function"@en ;
iof-av:naturalLanguageDefinition "A DesignedFunction that is realized in a PipeEndClosureProcess and that consists in sealing off an open, flanged pipe end so no fluid can pass, without joining it to another pipe or component."@en ;
skos:definition "A DesignedFunction that is realized in a PipeEndClosureProcess and that consists in sealing off an open, flanged pipe end so no fluid can pass, without joining it to another pipe or component."@en .
### Process type
:COPI_0000764 rdf:type owl:Class ; # PipeEndClosureProcess
rdfs:subClassOf :COPI_0000009 ; # MaterialContainment
rdfs:label "pipe end closure process"@en ;
iof-av:naturalLanguageDefinition "A PlannedProcess in which a flanged pipe end is sealed by bolting a solid plate over its opening, preventing any fluid flow through that end."@en ;
skos:definition "A PlannedProcess in which a flanged pipe end is sealed by bolting a solid plate over its opening, preventing any fluid flow through that end."@en .
:COPI_0000009 rdf:type owl:Class . # MaterialContainment
### Equipment universal: BlindFlange
:COPI_0000745 rdf:type owl:Class ; # BlindFlange
owl:equivalentClass [
rdf:type owl:Class ;
owl:intersectionOf (
:COPI_0000273 # Flange
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000763 # PipeEndClosureFunction
]
)
] ;
rdfs:label "blind flange"@en ;
iof-av:naturalLanguageDefinition "A blind flange is a flange that bears a pipe-end closure function: a solid plate with no central opening, bolted over a flanged pipe end to seal it off, rather than to connect it to another component."@en ;
skos:definition "A blind flange is a flange that bears a pipe-end closure function: a solid plate with no central opening, bolted over a flanged pipe end to seal it off, rather than to connect it to another component."@en ;
iof-av:naturalLanguageDefinition "Um flange cego e um flange que possui uma funcao de fechamento de extremidade de tubo: uma placa solida sem abertura central, aparafusada sobre uma extremidade de tubo flangeada para veda-la, em vez de conecta-la a outro componente."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every blind flange is a flange that bears a pipe-end closure function and has a solid plate form quality, and conversely."@en ;
iof-av:firstOrderLogicAxiom "∀x (BlindFlange(x) ↔ Flange(x) ∧ ∃f (PipeEndClosureFunction(f) ∧ bearerOf(x,f)) ∧ ∃q (SolidPlateForm(q) ∧ hasQuality(x,q)))"@en ;
skos:definition "[ISO 15926-4] A <BLIND FLANGE> is a <PIPE FLANGE> that is without a central opening and used to shut off a flanged pipe end."@en ;
skos:definition "[OnePetro] A flange plate without an opening, normally used as seal-off assurance over an unused line."@en ;
skos:definition "[POSC Caesar] A pipe flange that is without a central opening and used to shut off a flanged pipe end."@en .
Axiomatization Decision Log
1
Identity-Giving Function
Function class
PipeEndClosureFunction
⊑ DesignedFunction
Realized in
PipeEndClosureProcess
⊑ MaterialContainment
Not a subtype of the genus Flange's own ConnectionFunction: a blind flange's purpose is the functional opposite (closing a line, not joining two). Treated as an independent new function per the Reuse vs. Creation Policy's 'New' case, matching the established precedent of 'blow down valve' (RapidDepressurizationFunction, not a Valve-function subtype, still genus=Valve, axiom_mode=equivalent).
2
Genus Determination
Flange
All three definitions name PIPE FLANGE as parent; 'flange' (already enriched, genus=Coupling, exported) is the closest enriched supertype and matches the physical form (a flange plate that bolts to a mating flange) even though the function differs from the genus's own.
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
No separable component distinguishes a blind flange from the genus; the defining trait is the absence of a bore (a quality/geometric property of the single plate body), not a part.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
—
Outputs (O)
—
Transformation (T)
no fluid participants -- the process sealed off a previously open pipe end so that no flow occurs through it
Unlike a generic flange (which conducts fluid across the joint it connects), a blind flange's entire purpose is to prevent flow, so it has no fluid input/output participants -- matching the 'containment' canonical term used for other passive-enclosure classes (vessels, tanks, flanges, seals per the canonical vocabulary's own description).
5
Axiom Mode Decision
Necessary + Sufficient
— modelled as a defined class
(≡, EquivalentClass). Automatic classification is
appropriate for this concept.
Cross-Standard Observations
ISO 15926-4, OnePetro Glossary, and POSC Caesar RDL all converge on the same closure/seal-off purpose (ISO 15926-4 and POSC Caesar are near-identical text, OnePetro uses different wording but the same meaning) -- strong, consistent grounding, no additional secondary/tertiary sourcing was pursued given this richness.
Reviewer Notes
Step 2b consciously not pursued: three consistent cross-source primary definitions already ground the closure-function differentia in full, and no structural necessary_parts claim is being made (the defining trait is the absence of an opening, modeled as a quality, not a part).
