{
  "schema": "piping-h2s-hydrate-boundary/v1",
  "object_id": "c13-h2s-hydrate-boundary",
  "axes": {
    "temperature_F": [
      40,
      90
    ],
    "pressure_psig": [
      20,
      600
    ],
    "pressure_scale": "logarithmic"
  },
  "boundary_vertices": [
    {
      "temperature_F": 47.5,
      "pressure_psig": 20
    },
    {
      "temperature_F": 85,
      "pressure_psig": 300
    },
    {
      "temperature_F": 85,
      "pressure_psig": 600
    }
  ],
  "reading_uncertainty": {
    "temperature_F": 0.5,
    "pressure_fraction": 0.05,
    "meaning": "conservative plot-reading envelope, not fluid-model uncertainty"
  },
  "recovery": "Original graphic straightsegment fromloweredge near47.5F20psig to85F300psig then vertical85F600psig. Vertices approximate graphical readings. Straightline on semilog coordinates used solely to redraw displayedgraphic; no independent equilibrium model.",
  "regions": "possible hydrate formation left/above boundary; labelled no formation right/below, only within historicalchart basis",
  "source_fluid_basis": "H2S+water described; composition,mixtures,wateractivity,equilibrium convention and experimentalbasis not established",
  "operational_hold": "Cannot classify an actual mixedgas/fluid from this chart alone; establish applicable fluid/model/adoption first",
  "no_extrapolation": true
}