{
  "schema": "piping-threaded-isolation/v1",
  "category": "capability, not instantaneous pressure",
  "primary": "no specified upstream isolation",
  "secondary": "specified upstream valve and process attachment",
  "operating_secondary": "live if valve open",
  "isolated_state": "verify boundary and downstream condition",
  "matrix": [
    [
      "piping_equipment",
      "primary",
      "conditional_A",
      "excluded",
      "excluded"
    ],
    [
      "piping_equipment",
      "secondary",
      "conditional_A",
      "conditional_A",
      "excluded"
    ],
    [
      "instrument",
      "primary",
      "conditional_B",
      "excluded_exception_route",
      "excluded"
    ],
    [
      "instrument",
      "secondary",
      "permitted",
      "permitted",
      "permitted_table_only_critical_design_external"
    ]
  ],
  "category_order": [
    "sour",
    "severe",
    "critical"
  ],
  "category_definition": "external adopted service/material specifications; not H2S concentration mapping",
  "conditions": "All table notes and \u00a712.2.2 locally retained in prose; no executable selector",
  "critical_scope": "critical design outside source specification"
}