{
  "schema": "c20-enclosure-functions-v1",
  "scope": "Conceptual temporary leak enclosure under locally adopted engineering assessment; not a construction detail.",
  "states": [
    {
      "id": "original-designed-contact",
      "contact": "Process fluid inside original boundary, bolting outside its designed wetted contact."
    },
    {
      "id": "enclosed-leak-contact",
      "contact": "Fluid can occupy enclosure annulus and expose original components/bolting."
    }
  ],
  "functions": [
    "Contain leakage",
    "Retain joint/separation load through qualified original or added holding path",
    "Support added repair/contents mass",
    "Maintain compatible wetted materials/sealant temperature envelope",
    "Remain assessable over planned deterioration/life"
  ],
  "holding_alternative": "Separately designed strongback may establish retention where original fasteners cannot be relied on; enclosure shape alone does not prove that function.",
  "crack_alternatives": [
    "Growth conditions eliminated/mitigated over repair life",
    "Applicable FFS growth confined within enclosure boundary",
    "Defined crack/separation scenario and retention designed for full circumferential separation",
    "Applicable fully encapsulated vent/drain case"
  ],
  "not_shown": [
    "Actual clamp/seal/strongback design",
    "Qualified load/pressure capacity",
    "Source job procedure",
    "Dimensional fitup or actual defect geometry"
  ]
}