{
  "title": "Valve assembly thermal protection and restored state",
  "scope": "Compare bounded component-sensitive routes; actual construction, materials, seals, joining method and treatment determine use. No universal disassembly, valve position or temperature rule.",
  "routes": [
    {
      "route": "Specified P1 carbon valve socket/seal work through NPS 1.5",
      "state": "Both welds heated simultaneously under local PWHT method; body/pipe insulated, upper bonnet uninsulated and not directly heated",
      "observations": [
        "Weld/body preheat and interpass",
        "Separate bonnet interpass",
        "External treatment thermocouples"
      ],
      "PWHT_position": "Closed then backed off2 handwheel turns under this method"
    },
    {
      "route": "Class-specific bolted bonnet/cover valve where PWHT is required",
      "state": "Bonnet/cover,gasket,internals/trim removed,tagged,protected",
      "restoration": "Correct identified assembly,newgaskets,requiredchecks/test; no oven condition supplied"
    },
    {
      "route": "Specified soft-seat socket-valve construction in0.75/1/1.5in sizes",
      "state": "Qualified no-disassembly arc method; body cooled to200°F between passes andpromptly after the last pass",
      "overheat_response": "Above400°F immediatelyafter a pass:disassemble/examine; replaceif damaged",
      "limits": "Specific construction/process/rod basis, not all soft-seat valves"
    }
  ],
  "other_positions": "Another soft-seat route uses openclosuremember; gate/globe route uses closedthenhalfturnopen forwelding. Not substituted forPWHTposition.",
  "verification": [
    "Correctparts/gaskets",
    "Orientation andcompleteoperatingtravel",
    "Packing/gasketcondition",
    "Prescribed containment andseatperformance evidence remain distinct"
  ]
}