Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
orifice plate
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: structure-based → ⊑
Orifice plate identity is fundamentally given by its physical structure: a thin plate with a specified hole. While it has flow measurement function, different hole configurations (concentric, eccentric, segmental) with the same measurement function are distinguished by geometry, not functional differences. The extensive ISO 15926 taxonomy shows primarily constructive variants based on hole shape and configuration.
Validation status
Why primitive (necessary only)
Reviewer notes
FOL theory & disjointness
First-order logic theory (generated)
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Disjoint with
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Expert review
Axiomatization steps
1
Identity-Giving Function
✓ done
⚠ not anchored
FlowMeasurementFunction → FlowMeasurementProcess
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COPI-Core operation
⚠ Process parent
PlannedProcess reaches no COPI-Core operation, and no gap (out of scope / coverage gap) is recorded.
LLM rationale:
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.
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Expert review
2
Genus Proximus
✓ done
FlowElement · MaterialArtifact
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Genus (genus proximum)
Most specific superclass — may be a domain class like "Valve" or an IOF-Core root.
BFO/IOF-Core Root
bfo:Object branch
bfo:ObjectAggregate branch
bfo:ImmaterialEntity branch
LLM rationale:
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.
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Expert review
3
Differentia Specifica
✓ done
∃hasPart.ThinPlate ⊓ ∃hasPart.SpecifiedHole
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Conditions that distinguish
Orifice Plate
from sibling classes under genus
FlowElement.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The defining structural characteristic is the combination of thin plate geometry with a specified hole. This differentiates it from other differential pressure flow measuring elements that use different physical mechanisms.
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Expert review
4
Necessary Parts
✓ done
ThinPlate
▼
Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
These are the universal structural components that define orifice plate identity across all subtypes, regardless of hole shape or configuration.
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Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
PortionOfFluid → PortionOfFluid
▼
Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
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.
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Expert review
More
Alternative labels
none
▼
Synonyms / alternative labels (comma-separated) — skos:altLabel
Language auto-detected on export (PT if the label contains accents, EN otherwise).
Properties as BFO qualities
no CFIHOS/DEXPI properties
▼
No CFIHOS/DEXPI properties found for this cluster.
Custom axioms
none
▼
Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on Orifice Plate.
Write the restriction block in Turtle syntax (without the leading
rdfs:subClassOf).
Example: [ owl:onProperty :hasPart ; owl:someValuesFrom :Wellhead ]
Cross-standard divergences
none detected yet
▼
Click "Detect divergences" to analyse cross-standard disagreements for this cluster.
Source Definitions (2)
cfihos V2.0
orifice plate — AbstractTagAndEquipmentClass
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Orifice plate
Definition text hidden (copyrighted standard) — sign in to view, or follow the source link above.
Provenance tiers (2)
Sources the pipeline cited while building this entry. Verbatim = the quote was copied word-for-word from that source; summary = paraphrased.
Linked competency questions
- answered Which equipment classes in COPI have iof:MaterialArtifact as their BFO genus root?
- answered What is the difference between an orifice plate and a restriction orifice?
- answered What is the genus of an orifice plate in COPI?
- answered What is the identity-giving function of an orifice plate?
- open What is a thin plate?
- open Is a thin plate a necessary component of every orifice plate?
OWL/Turtle preview
Download .ttl
Numeric
COPI_* IRIs from copi-iri-map.tsv, with the readable name as a trailing comment. Names not yet in the map stay readable.
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ID 56 · claude-sonnet-4-20250514
Created 2026-04-13 23:41
Updated 2026-09-08 12:26
