{
  "schema": "piping-nonmetallic-joint-paths/v1",
  "object_id": "c02-nonmetallic-joint-paths",
  "geometry": "qualitative upper wall sections",
  "mechanisms": [
    {
      "panel": "A \u00b7 Butt fusion",
      "observation": "Fused end faces and double bead"
    },
    {
      "panel": "B \u00b7 Socket fusion / solvent cement",
      "observation": "Overlapping interface; process differs"
    },
    {
      "panel": "C \u00b7 Adhesive bell joint",
      "observation": "Compatible adhesive at prepared mating ends"
    },
    {
      "panel": "D \u00b7 Butt-and-wrap / overlay",
      "observation": "Resin / reinforcement bridges prepared joint"
    },
    {
      "panel": "E \u00b7 O-ring seal without restraint",
      "observation": "Seal contact alone supplies no axial restraint"
    },
    {
      "panel": "F \u00b7 Seal plus mechanical restraint",
      "observation": "Separate retaining feature carries axial load"
    }
  ],
  "independent_duties": [
    "sealing contact",
    "axial load path",
    "formation process and completed state"
  ],
  "restrained_oring_examples": [
    "specified threads",
    "clamp",
    "key",
    "retaining ring"
  ],
  "selected_hdpe_routes": {
    "general_purpose": "fully rated fully thrust restrained mechanical coupling; external restraint not substitution; flanged alternative",
    "fire_protection_approved": "flange adapter plus backing ring; no mechanical coupling or external restraint"
  },
  "transitions": "each material interface and complete product rating requires its selected basis",
  "dimensions_or_torques": null
}