{
  "schema": "piping-hdpe-duration-collapse/v1",
  "object_id": "c02-hdpe-duration-collapse",
  "axes": {
    "x": "hours logarithmic",
    "domain_hours": [
      0.01,
      1000000.0
    ],
    "y": "buckling strength pk psi logarithmic",
    "domain_psi": [
      0.5,
      150
    ]
  },
  "curves": {
    "11": [
      {
        "hours": 1,
        "psi": 126.01
      },
      {
        "hours": 10,
        "psi": 106.61
      },
      {
        "hours": 100,
        "psi": 87.49
      },
      {
        "hours": 1000,
        "psi": 70.3
      },
      {
        "hours": 10000,
        "psi": 58.59
      },
      {
        "hours": 100000,
        "psi": 50.95
      },
      {
        "hours": 335000,
        "psi": 47.37
      }
    ],
    "17": [
      {
        "hours": 0.1,
        "psi": 42.46
      },
      {
        "hours": 1,
        "psi": 32.5
      },
      {
        "hours": 10,
        "psi": 25.64
      },
      {
        "hours": 100,
        "psi": 20.36
      },
      {
        "hours": 1000,
        "psi": 17.07
      },
      {
        "hours": 10000,
        "psi": 14.93
      },
      {
        "hours": 100000,
        "psi": 12.67
      },
      {
        "hours": 335000,
        "psi": 11.93
      }
    ],
    "26": [
      {
        "hours": 0.1,
        "psi": 13.39
      },
      {
        "hours": 1,
        "psi": 10.0
      },
      {
        "hours": 10,
        "psi": 7.38
      },
      {
        "hours": 100,
        "psi": 5.82
      },
      {
        "hours": 1000,
        "psi": 4.68
      },
      {
        "hours": 10000,
        "psi": 3.83
      },
      {
        "hours": 100000,
        "psi": 3.19
      },
      {
        "hours": 335000,
        "psi": 2.9
      }
    ],
    "32.5": [
      {
        "hours": 0.1,
        "psi": 7.03
      },
      {
        "hours": 1,
        "psi": 5.22
      },
      {
        "hours": 10,
        "psi": 4.0
      },
      {
        "hours": 100,
        "psi": 3.17
      },
      {
        "hours": 1000,
        "psi": 2.61
      },
      {
        "hours": 10000,
        "psi": 2.15
      },
      {
        "hours": 100000,
        "psi": 1.88
      },
      {
        "hours": 335000,
        "psi": 1.71
      }
    ]
  },
  "top_tick_qualification": "The printed 150/100 interval does not follow the lower decade scale; the upper interval is calibrated separately from its labelled endpoints. The lower logarithmic fit is not extended through that interval.",
  "recovery": "Selected original thickline ordinate readings, manual, from standalonechart1200x1260; y1psi895,y100psi137; source x tick1013\u21921e5h1135\u21921e6h, hmarker1077 approx3.35e5h. Source secondary50yearannotation is not exact hour conversion at marker; preserve discrepancy.",
  "uncertainty": "\u00b18pixel ordinate \u2248\u00b15%pressure; timecursor uncertainty \u00b10.05decade; intersample curvature not quantified",
  "source_note": "experimental curves extrapolated to50years; no experimental/extrapolation transition marked",
  "strength_not_allowable": true,
  "material_grade_temperature": "Not supplied with these historical curves; the adjacent PE3408 internal-pressure table does not establish their grade or temperature.",
  "operational_hold": "Establish actual grade, temperature, ovality, timehistory and applicable dataset/safetybasis before design transfer",
  "no_extrapolation_beyond_source": true
}