{
  "title": "Plastic pipe data for AI marking and dimension context",
  "source_page": "https://fiund.com/industries/plastic-pipe-marking-dimension-context-data",
  "authorship": "Original fictional Fiund editorial exercise. No actual operating records or third-party source assets are included.",
  "example": {
    "title": "A marking identifies nominal class, not a measured diameter",
    "context": "Fictional pipe props are cardboard. Their printed classes have no connection to actual piping standards.",
    "records": [
      [
        "1",
        "Printed label",
        "Mock pipe P4 marked nominal N20."
      ],
      [
        "2",
        "Drawing legend",
        "N20 is a size category; reference plane X is where diameter observations are recorded."
      ],
      [
        "3",
        "Sample worksheet",
        "P4 outer diameter 23 mm at plane X; wall reading absent."
      ]
    ],
    "question": "How should these fields be reported?",
    "answer": "Record nominal category N20 from record 1 and the observed 23 mm outer diameter at X from record 3. The legend in record 2 explains why those fields can differ. No wall thickness or inner diameter is supplied in this packet.",
    "failureModes": [
      "Converting the nominal class directly into millimeters",
      "Inferring an inside diameter without wall geometry"
    ],
    "fields": [
      [
        "nominal_category",
        "Preserves the label's classification"
      ],
      [
        "measurement_plane",
        "Identifies where the reading applies"
      ],
      [
        "diameter_type",
        "Distinguishes outer and inner geometry"
      ]
    ],
    "holdout": "Provide an identical nominal label on two mock product families and require family-specific matching.",
    "boundary": "No installation instructions, pressure ratings, actual standards labeling or compliance claims."
  }
}