exported
necessary
orifice plate
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Orificeplate
Generated on 2026-04-13
Natural Language Definition
EN
An orifice plate is a flow element that consists of a thin plate with a specified hole through which fluid flows to create differential pressure for flow rate measurement.
PT-BR
Uma placa de orifício é um elemento de medição de fluxo que consiste de uma placa fina com um orifício especificado através do qual o fluido flui para criar pressão diferencial para medição da taxa de fluxo.
Formal Axioms
Semi-formal (Aristotelian)
Every orifice plate is a flow element that has a thin plate component and has a specified hole component and bears a flow measurement function.
First-Order Logic Theory
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▸ Stored override
∀x(OrificePlate(x) → FlowMeasuringElement(x) ∧ ∃p,h(ThinPlate(p) ∧ SpecifiedHole(h) ∧ hasComponentPartAtAllTimes(x,p) ∧ hasComponentPartAtAllTimes(x,h)) ∧ ∃f(FlowMeasurementFunction(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: OrificePlate
<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_0000174 rdf:type owl:Class ; # FlowMeasurementFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000522 # FlowMeasurementProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000522 # FlowMeasurementProcess
] ;
rdfs:label "flow measurement function"@en ;
rdfs:label "função de medição de fluxo"@pt-br .
### Process type
:COPI_0000522 rdf:type owl:Class ; # FlowMeasurementProcess
rdfs:subClassOf iof-core:PlannedProcess ;
rdfs:label "flow measurement process"@en ;
rdfs:label "processo de medição de fluxo"@pt-br .
:COPI_0000522 # FlowMeasurementProcess
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: OrificePlate
:COPI_0000136 rdf:type owl:Class ; # OrificePlate
rdfs:subClassOf :COPI_0000116 ; # FlowElement
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000174 # FlowMeasurementFunction
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasComponentPartAtAllTimes ;
owl:someValuesFrom :COPI_0000360 # ThinPlate
] ;
rdfs:label "orifice plate"@en ;
rdfs:label "placa de orifício"@pt-br ;
iof-av:naturalLanguageDefinition "An orifice plate is a flow element that consists of a thin plate with a specified hole through which fluid flows to create differential pressure for flow rate measurement."@en ;
skos:definition "An orifice plate is a flow element that consists of a thin plate with a specified hole through which fluid flows to create differential pressure for flow rate measurement."@en ;
iof-av:naturalLanguageDefinition "Uma placa de orifício é um elemento de medição de fluxo que consiste de uma placa fina com um orifício especificado através do qual o fluido flui para criar pressão diferencial para medição da taxa de fluxo."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every orifice plate is a flow element that has a thin plate component and has a specified hole component and bears a flow measurement function."@en ;
iof-av:firstOrderLogicAxiom "∀x(OrificePlate(x) → FlowMeasuringElement(x) ∧ ∃p,h(ThinPlate(p) ∧ SpecifiedHole(h) ∧ hasComponentPartAtAllTimes(x,p) ∧ hasComponentPartAtAllTimes(x,h)) ∧ ∃f(FlowMeasurementFunction(f) ∧ bearerOf(x,f)))"@en ;
iof-av:isPrimitive "true"^^xsd:boolean ;
iof-av:primitiveRationale "Constructive classification based on physical structure. Under OWA, any plate with a hole could potentially be classified as an orifice plate, but many perforated plates serve different purposes (structural, filtering, etc.). The structural differentia alone is not sufficient without industrial context validation."@en ;
skos:definition "[CFIHOS] A physical object that is a thin plate with a specified hole in the middle. It is usually placed in a pipe to measure the rate of fluid flow."@en ;
skos:definition "[OnePetro] Part of an orifice metering system. A plate with a hole through which a single phase flow produces a pressure drop."@en .
:COPI_0000360 rdf:type owl:Class ; # ThinPlate
rdfs:subClassOf iof-core:MaterialArtifact ;
rdfs:label "Placa que possui geometria de espessura fina e"@pt-br ;
rdfs:label "thin plate"@en .
# Disjointness: OrificePlate and Valve
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000136 :COPI_0000077 ) . # OrificePlate, Valve
# Disjointness: OrificePlate and Pipe
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000136 :COPI_0000321 ) . # OrificePlate, Pipe
# Disjointness: OrificePlate and Filter
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000136 :COPI_0000081 ) . # OrificePlate, Filter
Axiomatization Decision Log
1
Identity-Giving Function
Function class
FlowMeasurementFunction
⊑ DesignedFunction
Realized in
FlowMeasurementProcess
⊑ PlannedProcess
All orifice plates are designed to measure fluid flow rate by creating a differential pressure across the restriction. This is the generic function of the broader class, though specific subtypes may have additional roles like flow restriction.
2
Genus Determination
FlowElement
From the ISO 15926 hierarchy, orifice plates are classified as 'VOLUME flow element - ORIFICE PLATE'. The parent_candidates shows 'instrument equipment' but FlowElement is more specific and ontologically correct. Orifice plates are essentially monolithic measurement devices, making them MaterialArtifacts rather than Assemblies.
3
Necessary Parts
| Part class | Parent | Relation |
|---|---|---|
| ThinPlate | MaterialArtifact | hasComponentPartAtAllTimes |
These are the universal structural components that define orifice plate identity across all subtypes, regardless of hole shape or configuration.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
PortionOfFluid
— single phase flow
Outputs (O)
PortionOfFluid
— reduced pressure, measurable differential
Transformation (T)
kinetic energy conversion to pressure differential for flow measurement
Orifice plates create a pressure drop by restricting flow, with the differential pressure being proportional to flow rate squared. Single phase constraint comes from onepetro definition.
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 classification based on physical structure. Under OWA, any plate with a hole could potentially be classified as an orifice plate, but many perforated plates serve different purposes (structural, filtering, etc.). The structural differentia alone is not sufficient without industrial context validation.
Disjointness Axioms
Valve
Pipe
Filter
C4: Valve, Pipe, Filter. Process signature incompatibility: valves control flow (not measure), pipes conduct without restriction measurement, filters separate particles rather than measure flow rate through differential pressure.
Cross-Standard Observations
CFIHOS provides a general structural definition while onepetro emphasizes the metering system context and single-phase flow constraint. ISO 15926 shows extensive constructive taxonomy based on hole geometry, confirming the constructive classification basis. The 'usually placed in a pipe' from CFIHOS suggests typical installation context rather than essential property.