Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
blind flange
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: function-based → ≡
All three cross-source definitions converge on a purpose distinct from, and opposite to, a generic flange's connection purpose: 'used to shut off a flanged pipe end' / 'seal-off assurance over an unused line'. A blind flange closes a line rather than joining two pipe ends, so its identity-giving trait is this closure capability, not the generic Flange genus's ConnectionFunction.
Validation status
Why primitive (necessary only)
Reviewer notes
FOL theory & disjointness
First-order logic theory (generated)
Loading…
Disjoint with
▸
Expert review
Axiomatization steps
1
Identity-Giving Function
✓ done
PipeEndClosureFunction → PipeEndClosureProcess ⊑ MaterialContainment
▼
COPI-Core operation
MaterialContainment via process parent MaterialContainment
LLM rationale:
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).
▸
Expert review
2
Genus Proximus
✓ done
Flange · MaterialArtifact
▼
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:
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.
▸
Expert review
3
Differentia Specifica
✓ done
∃bearerOf.PipeEndClosureFunction ⊓ ∃hasQuality.SolidPlateForm
▼
Conditions that distinguish
Blind Flange
from sibling classes under genus
Flange.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
Functional differentia (the closure function) plus a quality capturing the defining negative structural trait (no central opening / solid plate), since 'absence of an opening' cannot be stated as a component part.
▸
Expert review
4
Necessary Parts
✓ done
no necessary parts
▼
Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
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.
▸
Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
∅ → ∅
▼
Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
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).
▸
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 Blind Flange.
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.
