{
  "title": "Riser section shape and sealpressure/movement assessment",
  "scope": "Rigidmetallicriser methods; not nonmetal/flexiblequalification or specificseal acceptance",
  "ovalisation": {
    "equation": "Fo=100(Dmax-Dmin)/(Dmax+Dmin)",
    "diameters": "Same-unitoutside diameters includingmanufacture/pressure/bending",
    "local_limit_percent": 2.5,
    "hypothetical_Dmax_mm": 410,
    "hypothetical_Dmin_mm": 390,
    "method_percent": 2.5,
    "other_mean_diameter_normalization_percent": 5,
    "limit": "Differentdenominator doesnotshare same acceptance; no collapse/fatigueproof"
  },
  "seal": {
    "equation": "Ps=(Pj+rhoj g Hj)-rhos g Hs",
    "quantities": {
      "Ps": "Pa inside-minus-outside differential",
      "Pj": "Pa gauge atfluidtop, atmosphericreferenceconsistent",
      "rhoj_rhos": "kg/m3 retainedfluid andseawater",
      "Hj": "m seal-to-fluidtop height",
      "Hs": "m sealdepthbelowmeansealevel",
      "g": "m/s2"
    },
    "hypothetical": {
      "Pj_Pa_gauge": 0,
      "Hj_m": 52,
      "Hs_m": 40,
      "rhos_kgm3": 1025,
      "g_ms2": 9.81,
      "liquid_rhoj_kgm3": 1025,
      "liquid_Ps_bar": 1.20663,
      "constant_density_gas_rhoj_kgm3": 1.2,
      "gas_Ps_bar": -4.015978560000001
    },
    "conditions": "Hydrostaticconsistentreference/stateddensities; gasconstantdensity teachingcontrastnotcompressiblemodel/wavepressureassessment",
    "architecture": [
      {
        "type": "Conicalelastomer",
        "question": "Maintainedcontact/compressionandlimitedmotion"
      },
      {
        "type": "Inflatedtori",
        "question": "Shear/slipdamageto inflatedseal"
      },
      {
        "type": "Pull-inboot",
        "question": "Wear andnonreplaceability afterinstall"
      },
      {
        "type": "Integral orzippeddiaphragm",
        "question": "Pre-pullprotection/nonreplacement versuspostinstallreplaceable"
      },
      {
        "type": "Longbellows sleeve",
        "question": "Greateraxialmotionwithactualattachment/pressurequalification"
      },
      {
        "type": "Anchor-type",
        "question": "Keepscompressionbyrestrainingaxialriser motion; changedthermal loadpath"
      }
    ],
    "limit": "Illustrativefamily2/5barortravelvalues not acceptance ofhypotheticalpressures; actualdirection/travel/install/lifeverification required"
  },
  "svg": "c11-jtube-seal-pressure.svg"
}