{
  "reported_project": {
    "flow_m3_h": 150,
    "initial_head_m": 38,
    "restored_head_m": 45,
    "specified_radial_clearance_mm": 0.3,
    "found_radial_clearance_mm": 0.9,
    "motor_rating_kW": 30
  },
  "teaching_geometry_mm": {
    "rotor_land_OD": 120,
    "rotor_bore": 100,
    "rotor_length": 50,
    "ring_OD": 150,
    "ring_length": 25,
    "restored_ring_ID": 120.6,
    "worn_ring_ID": 121.8,
    "housing_OD": 180,
    "housing_length": 35
  },
  "teaching_hydraulics": {
    "density_kg_m3": 998,
    "gravity_m_s2": 9.80665,
    "gap_pressure_drop_Pa": 250000,
    "discharge_coefficient": 0.62
  },
  "scope": "Wear-ring interface study. Housing seat is nominal geometry; retention and interference fit are not specified. Leakage estimates are sensitivity calculations, not measured leakage or a prediction of head recovery."
}