{
  "kind": "Authored function comparison",
  "scope": "Locally adopted examples; no generic cover construction, attachment welding authorization or fire-survivability claim",
  "rows": [
    {
      "function": "Inner liner/intermediate insulation",
      "quantity": "Actual face temperature and exposure",
      "evaluation": "Material suitability at its position, relevant operating/intervention states and selected layer construction"
    },
    {
      "function": "Outer removable-cover fabric",
      "selected_material_limit_F": 500,
      "evaluation": "Material limit differs from accessible surface target; no direct contact with a hotter pipe inferred"
    },
    {
      "function": "Accessible face of selected removable cover",
      "selected_target_F": 110,
      "evaluation": "Requires actual heat-transfer construction; not demonstrated by fabric rating"
    },
    {
      "function": "Ventilated contact shield",
      "selected_minimum_standoff_in": 2.5,
      "selected_max_surface_F": 140,
      "evaluation": "Calculation/test of selected arrangement; longer pins may be necessary; access/drainage/visibility maintained"
    },
    {
      "function": "Fire-case insulation credit",
      "selected_minimum_exposure_F": 1660,
      "selected_minimum_duration_h": 2,
      "requirements": [
        "Qualified manufacturer or approved independent testing/rating",
        "Retain original shape and insulating value",
        "Retain most covering integrity",
        "Not dislodged by high-pressure firefighting streams"
      ],
      "evaluation": "Complete qualified installed assembly and maintained identity; ordinary existing cover or construction thickness alone does not establish credit",
      "jacket_material_basis": {
        "aluminum_permitted": false,
        "minimum_thickness_in": 0.01,
        "finish": "smooth",
        "condition": "annealed",
        "standard": "ASTM A240",
        "selected_stainless_type": 304,
        "upgrade_where_needed": 316,
        "bands_and_other_installation_hardware": "Stainless steel matching jacket material",
        "scope": "Same locally adopted fire-credit route; not the separate four-inch construction rule"
      }
    }
  ]
}