Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
tubing head
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: function-based → ≡
The tubing head is defined primarily by its function in wellhead operations: supporting the tubing hanger and providing connection interface between the tubing and Christmas tree. While it has structural aspects (flanged spool, tubing bowl), these serve the primary functional role.
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
⚠ not anchored
TubingSupportAndConnectionFunction → TubingSupportAndConnectionProcess
▼
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 to support the tubing hanger and provide mechanical interface for attaching the Christmas tree to the wellhead assembly, enabling controlled access to the tubing string.
▸
Expert review
2
Genus Proximus
✓ done
Assembly
▼
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 definitions consistently identify tubing head as a wellhead component. While WellheadComponent is not yet enriched in our ontology, it is the most specific appropriate superclass. The tubing head is an assembly with multiple connected parts (flanged spool, tubing bowl, connection interfaces) that functions as a single maintainable unit.
▸
Expert review
3
Differentia Specifica
✓ done
∃bearerOf.TubingSupportAndConnectionFunction ⊓ ∃hasPart.TubingBowl ⊓ ∃hasPart.ChristmasTreeConnectionInterface
▼
Conditions that distinguish
Tubing Head
from sibling classes under genus
Assembly.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The tubing bowl for hanger support and Christmas tree connection interface are the minimal structural requirements that distinguish tubing head from other wellhead components like casing heads or the Christmas tree itself.
▸
Expert review
4
Necessary Parts
✓ done
TubingBowl
▼
Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
These parts are structurally necessary for any tubing head to perform its dual function of tubing support and Christmas tree connection.
▸
Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
⚠ 2 not in vocab
TubingHanger → TubingString + ChristmasTreeConnectionPoint
▼
⚠ Participant type(s) not in COPI vocabulary
TubingString(already published — grandfathered)ChristmasTreeConnectionPoint
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.
This entry cannot be saved as validated until then.
Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
The tubing head receives a tubing hanger and provides both tubing string support and Christmas tree connection capability through mechanical load transfer and interface coupling.
▸
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 Tubing Head.
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.
