{
  "kind": "Historic adopted lookup teaching inputs; not current prices or financial advice",
  "economic_route_A": {
    "material": "calcium silicate",
    "ambient_F": 50,
    "wind_mph": 10,
    "after_tax_return_fraction": 0.15,
    "annual_maintenance_fraction": 0.05,
    "annual_energy_escalation_fraction": 0.07,
    "life_years": 10,
    "fuel_table_steps_USD_per_MMBtu": 0.5,
    "between_tables_rule": "Next higher fuel value",
    "hypothetical_fuel_USD_per_MMBtu": 3.25,
    "selected_table_USD_per_MMBtu": 3.5,
    "pipe_NPS": 6,
    "operating_F": 550,
    "temperature_band_F": [
      500,
      599
    ],
    "selected_thickness_in": 3,
    "lower_3USD_table_thickness_in": 2.5,
    "prohibited_averaging_thickness_in": 2.75,
    "annual_maintenance_fraction_basis": "Fraction of capital per year",
    "fuel_value_units": "USD per million Btu"
  },
  "personnel_route_A": {
    "material": "calcium silicate",
    "ambient_F": 100,
    "wind": "still",
    "max_surface_F": 140,
    "pipe_NPS": 6,
    "operating_F": 550,
    "thickness_in": 2.0,
    "scope": "Different duty/environment from economics, not replacementlookup"
  },
  "independent_route_B": {
    "material": "mineral wool",
    "ambient_F": 31,
    "wind_mph": 6.2,
    "life_years": 10,
    "tax_fraction": 0,
    "fuel_USD_per_MMBtu": 2.95,
    "return_fraction": 0.25,
    "boiler_efficiency_fraction": 0.8,
    "pipe_NPS": 6,
    "normal_F": 550,
    "normal_economic_thickness_in": 2.5,
    "HOLD_examples": [
      {
        "HOLD_F": 100,
        "thickness_in": 2.5
      },
      {
        "HOLD_F": 150,
        "thickness_in": 3
      }
    ],
    "scope": "Only compatible same adopted assembly permitsnormal/HOLDcomparison;highHOLDasteriskrequires specialdesign",
    "comparison": "Same compatible selected material/assembly normal versus HOLD duty; source schedules remain separate from route A."
  },
  "limits": [
    "No crossbasismaximumnumbervote",
    "No fiberglass550Fmethod: selectedfiberglassmax325F",
    "No source-age price/return basis treated as contemporaryadvice",
    "Actual service/material/assembly and project criteria remain required"
  ]
}