{
  "schema": "piping-jacket-boundaries/v1",
  "boundaries": [
    "core product wall",
    "outer jacket and end termination",
    "local jumpover jacket-medium boundary"
  ],
  "core_joint": "separable core seal separate from jacket jumpover",
  "spacer": "illustrated alternate specified-only three-contact construction; matching core material, clearance/open sectors, actual attachment/spacing required",
  "local_example": "condensing medium high entry low drain; countercurrent illustrated direction",
  "alternatives": [
    "liquid lowentry/highexit distinct route",
    "impingementplate selected entry detail",
    "siphon selected vertical drain detail"
  ],
  "test_sequence": "core leak test with core welds visible before closure; separate jacket test and core external differential",
  "excluded": "utility distribution, capacity, weld size, universal rating and catalogue dimension transfer"
}