Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
tubing hanger
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: function-based → ≡
The definitions consistently emphasize the support/suspension function ('supports the string', 'suspends and holds', 'hanger that is used for production tubing'). While there are constructive variants (slip type, threaded, etc.), the core identity is functional - providing mechanical support and sealing for tubing strings in wellheads.
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
TubingSupportFunction → TubingSupportProcess
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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:
The identity-giving function is providing mechanical support and suspension for tubing strings in wellheads. This is distinct from general structural support as it is specifically designed for tubing string suspension with integrated sealing capability in well completion systems.
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Expert review
2
Genus Proximus
✓ done
Assembly
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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:
No appropriate domain-specific parent exists in the enriched classes. 'WELL STRING HANGER' from iso15926 would be ideal but is not enriched. The tubing hanger is a complex mechanical assembly with multiple components (sealing system, support mechanism, connection elements) that work together as a causally unified object. It's more complex than a simple MaterialArtifact, warranting Assembly classification.
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Expert review
3
Differentia Specifica
✓ done
∃bearerOf.TubingSupportFunction ⊓ ∃hasComponentPartAtAllTimes.SealingSystem ⊓ ∃participatesIn.WellCompletionProcess
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Conditions that distinguish
Tubing Hanger
from sibling classes under genus
Assembly.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The TubingSupportFunction distinguishes it from other well equipment. The integrated SealingSystem is essential per CFIHOS definition to ensure hydraulic isolation. Participation in WellCompletionProcess contextualizes its specific application domain.
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Expert review
4
Necessary Parts
✓ done
SealingSystem
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Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
These three components are essential for any tubing hanger: sealing system for isolation, support mechanism for load bearing, and tubing connection for attachment. Specific implementations (slips, threads, etc.) vary by subtype.
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Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
⚠ 1 not in vocab
TubingString → TubingString
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⚠ Participant type(s) not in COPI vocabulary
TubingString(already published — grandfathered)
Participant types are hand-authored in
copi-vocab, not produced by the pipeline.
Replace each with an existing vocab type, redirect it to a BFO / IOF-Core class in copi-iri-map.tsv,
or add it to copi-vocab.ttl first.
Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
The tubing hanger receives a suspended tubing string and provides mechanical support while ensuring sealing isolation. No fluid transformation occurs - it's a passive mechanical support system.
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Expert review
More
Alternative labels
none
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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
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No CFIHOS/DEXPI properties found for this cluster.
Custom axioms
none
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Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on Tubing Hanger.
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.
