{
  "schema": "native-construction-v1",
  "scope": "Schematic tracer physical construction; no controls or utility circuit architecture",
  "contact_alternatives": [
    "Bare convection",
    "Spacer-isolated",
    "Conductive cement",
    "Cement + channel",
    "Preformed cement + channel",
    "Preinsulated isolated"
  ],
  "placements": [
    {
      "orientation": "horizontal",
      "tracers": 1,
      "page_down_angles_degrees": [
        30
      ],
      "reference": "30\u00b0 from bottom"
    },
    {
      "orientation": "vertical",
      "tracers": 1,
      "page_down_angles_degrees": [
        30
      ],
      "reference": "30\u00b0 from page-down axis"
    },
    {
      "orientation": "horizontal",
      "tracers": 2,
      "page_down_angles_degrees": [
        -30,
        30
      ],
      "reference": "\u00b130\u00b0 from bottom"
    },
    {
      "orientation": "vertical",
      "tracers": 2,
      "page_down_angles_degrees": [
        -90,
        90
      ],
      "reference": "Opposite sides"
    },
    {
      "orientation": "horizontal",
      "tracers": 3,
      "page_down_angles_degrees": [
        -40,
        0,
        40
      ],
      "reference": "Bottom and \u00b140\u00b0"
    },
    {
      "orientation": "vertical",
      "tracers": 3,
      "page_down_angles_degrees": [
        180,
        -60,
        60
      ],
      "reference": "Three equally distributed"
    }
  ],
  "source_printed_dimensions": [
    {
      "item": "contact securement maximum",
      "inches": 15,
      "printed_mm": 450,
      "status": "dimensionally inconsistent; resolve before fabrication"
    },
    {
      "item": "stainless band",
      "inches": [
        0.5,
        0.02
      ]
    },
    {
      "item": "straight-pipe tie interval",
      "inches": 24,
      "printed_mm": 600
    },
    {
      "item": "conductive width",
      "relation": "2D to 3D; D = tracer diameter"
    },
    {
      "item": "horizontal expansion loop diameter",
      "inches": 12,
      "printed_m": 0.305
    },
    {
      "item": "expansion loop interval",
      "feet": [
        60,
        100
      ],
      "printed_m": [
        18,
        30
      ]
    },
    {
      "item": "typical bend radii",
      "relation": "4 to 10 tube outside diameters; largest functional radius"
    }
  ],
  "conflicts": [
    {
      "id": "circumference",
      "text": "Equal circumferential spacing versus illustrated horizontal lower-sector grouping; project arrangement unresolved."
    },
    {
      "id": "expansion-union",
      "text": "Text excludes union in expansion loop; illustration depicts union or elbow option. Native figure adopts union-free loop and separate removal union."
    }
  ],
  "penetration": {
    "slot": "accommodates thermal expansion",
    "fill": "insulation mastic",
    "exposed_flange_tube": "insulating tape",
    "applicability": "hot-service construction; no generic cold vapor seal"
  },
  "checks": [
    "thermal contact",
    "drainage including local rises",
    "union alignment without tension",
    "removal access",
    "bend integrity",
    "securement",
    "weather restoration"
  ],
  "drawing_scale": "none; schematic",
  "numerical_performance": "not provided"
}