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        "material": "perlite",
        "NPS": "all",
        "raw": "1/2inch",
        "interpretation": "oversize convention unresolved"
      }
    ],
    "separate_steam_skin_effect": "25mm(1inch);dual-tube skin-effect50mm(2inches); not electriccable clearance"
  },
  "dimensional_example": {
    "scope": "conditional concentric teachinggeometry; localactual construction must resolvetext/drawing conflict",
    "NPS": 6,
    "selected_pipe_OD_in": 6.625,
    "pipe_OD_status": "explicit selectedteachingdimension consistent with existingC17historical comparison; not measuredcurrentproduct",
    "radial_insulation_t_in": 3,
    "text_raw": "insulation IDofNPS6plus1/2inch",
    "drawing_gap_raw": "1/2inchtracinggap(electric)",
    "drawing_total_OD_in": 13.625,
    "diametral_addition_case": {
      "D_b_in": 7.125,
      "D_ins_in": 13.125,
      "radial_gap_in": 0.25
    },
    "radial_gap_case": {
      "D_b_in": 7.625,
      "D_ins_in": 13.625,
      "radial_gap_in": 0.5
    },
    "equations": {
      "bare_insulation_OD": "D_ins=D_b+2t",
      "finished_envelope_OD": "D_finished=D_b+2t+2j"
    },
    "jacket_j_in": "unprovided; separate effective radial productcontribution",
    "unresolved": "drawing13.625matchesradialcase arithmetically; textID+.5suggestsdiametral addition; no universalresolvedconvention/finishedjacketOD"
  },
  "construction_alternatives": {
    "rigid": {
      "configuration": "oversizedrigidinsulation airgap",
      "purpose": "Full circumferential wind block at station interrupts axial air path; cable clearance maintained",
      "wind_block_material_description": "1200FE-glass(localdescription)",
      "locations": [
        "elbows",
        "tees",
        "flanges",
        "skid boundaries",
        "module boundaries"
      ],
      "straight_interval_ft": 20,
      "cable": "preserveactualspace/contact withoutembedding/crushing/damage"
    },
    "nonrigid": {
      "configuration": "compressible insulation beneathjacket",
      "purpose": "minimizecompression underexternalpressure",
      "extra_lap_zone": "uppercircumference9to3oclock",
      "unprovided": [
        "ratedexternalpressure",
        "stiffness",
        "allowabledeflection",
        "verifiedthermalperformance"
      ]
    }
  },
  "scope": "physicalenvelope only; no control/utilitycircuitredesign"
}