{
  "tankMeta": {
    "standard": "API 650 / API 653",
    "diameterMeters": 30.0,
    "heightMeters": 14.5,
    "shellCourses": 5,
    "nominalThicknessMm": 12.7,
    "minRetainingThicknessMm": 8.5
  },
  "floorPlates": [
    { "wedgeId": "W-01", "angleStartDeg": 0, "angleEndDeg": 30, "minThicknessMm": 6.2, "status": "Acceptable" },
    { "wedgeId": "W-02", "angleStartDeg": 30, "angleEndDeg": 60, "minThicknessMm": 4.1, "status": "Wall Thinning (Repair Recommended)" },
    { "wedgeId": "W-03", "angleStartDeg": 60, "angleEndDeg": 90, "minThicknessMm": 6.5, "status": "Acceptable" }
  ],
  "shellReadings": [
    { "course": 1, "heightM": 2.5, "nominalMm": 16.0, "measuredMinMm": 13.8, "corrosionRateMmYr": 0.12 },
    { "course": 2, "heightM": 5.5, "nominalMm": 14.0, "measuredMinMm": 12.1, "corrosionRateMmYr": 0.08 }
  ]
}