Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
thermowell stem
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: structure-based → ⊑
The concept is defined primarily by its physical geometry ('hollow cylindrical part') and structural role as a component part of a thermowell, not by an independent designed function. The differentia comes from the structural configuration (hollow cylindrical shape, protruding position) rather than a unique function subtype.
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
TemperatureSensorProtectionFunction → TemperatureSensorProtectionProcess
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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:
Reusing TemperatureSensorProtectionFunction from the already-enriched thermowell class. The thermowell stem inherits this function as it is the part of the thermowell that actually realizes the protection function by physically housing the sensor element.
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Expert review
2
Genus Proximus
✓ done
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:
A thermowell stem is explicitly defined as a part of a thermowell ('the hollow cylindrical part of a thermowell'). It is not an independent object with its own causal boundary, but rather a fiat part demarcated within the larger thermowell assembly. The most specific appropriate superclass is FiatObjectPart, as it is a portion of the thermowell object identified by its structural and functional role.
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Expert review
3
Differentia Specifica
✓ done
∃partOf.Thermowell ⊓ ∃hasQuality.HollowCylindricalShape ⊓ ∃hasLocation.ProcessMediumIntrusionZone
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Conditions that distinguish
Thermowell Stem
from sibling classes under genus
MaterialArtifact.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The differentia specifies: (1) part-of relationship to thermowell specifically, (2) hollow cylindrical geometry for housing sensor elements, and (3) positioning that protrudes into process medium for thermal contact. These are the minimal conditions that distinguish this part from other potential thermowell components.
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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 component parts are identified. The thermowell stem is described as a monolithic hollow cylindrical part. The temperature sensor/thermocouple it houses is not a permanent component part but rather a removable instrumentation element that occupies the hollow space.
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Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
∅ → ∅
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Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
The stem's process role is pure thermal conduction - it transfers heat from the external process medium to the internal sensor without changing the thermal energy. The hollow cylindrical geometry enables housing the sensor while the wall material provides the conductive path.
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Expert review
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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 Thermowell Stem.
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 (1)
THERMOWELL STEM — ClassOfInanimatePhysicalObject
Definition text hidden (copyrighted standard) — sign in to view, or follow the source link above.
Provenance tiers (1)
Sources the pipeline cited while building this entry. Verbatim = the quote was copied word-for-word from that source; summary = paraphrased.
Linked competency questions
- open What is a thermowell stem?
- open Is a thermowell stem a necessary component of every thermowell?
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 419 · claude-sonnet-4-20250514
Created 2026-05-04 18:27
Updated 2026-09-08 12:26
