{
  "schema": "c13-oxygen-condition-map-v1",
  "scope": "Dry gaseous oxygen under the locally stated service/intervention basis.",
  "representation": "Authored condition map; not a job procedure or valve sequence.",
  "conditions": [
    {
      "id": "operating-condition",
      "medium": "oxygen",
      "required_properties": [
        "Compatible components",
        "Retained cleanliness",
        "Valve pressure-equalisation/duty and directional operation basis"
      ]
    },
    {
      "id": "oxygen-removed-condition",
      "medium": "nitrogen",
      "required_properties": [
        "Oxygen removed by venting then oil-free nitrogen purge",
        "Gas purity and pressure/backflow control"
      ],
      "not_established": "Personnel-entry atmosphere"
    },
    {
      "id": "physical-separation-condition",
      "purpose": "Internal inspection",
      "alternatives": [
        "Complete removal",
        "Clean visible-handled spades at all connections"
      ],
      "not_equivalent": "One shut valve"
    },
    {
      "id": "entry-condition",
      "purpose": "Personnel entry",
      "additional_properties": [
        "Nitrogen replaced by air",
        "Maintained ventilation",
        "Readiness under adopted entry procedure"
      ]
    }
  ],
  "restoration": [
    "Cleanliness",
    "Component suitability",
    "Separation safeguards",
    "Operating configuration"
  ],
  "entry_is_additional_condition": true,
  "not_shown": [
    "Valve line-up",
    "Job isolation plan",
    "Entry testing/permit/rescue procedure",
    "Detailed pressure/flow setpoints"
  ]
}