{
  "schema": "c20-adopted-procedure-distinctions-v1",
  "scope": "Distinct illustrated adopted methods, not one merged permission/envelope.",
  "wall_eligibility": [
    {
      "basis": "Coupled blow-out screen",
      "condition": "Measured minimum5mm only with specifiedyield<=450N/mm2,operatingtemperature<=350C andhoopstress<=72%SMYS; other material/fluid/qualification restrictions apply."
    },
    {
      "basis": "Separate minimum-wall practice",
      "condition": "1/4in=6.35mm unless specifically accepted engineering evaluation of lower wall; whole accompanying procedure applies."
    }
  ],
  "flow_bases": [
    {
      "basis": "No-flow exclusion practice",
      "conditions": [
        "No-flow welding prohibited",
        "Minimum1.3ft/s",
        "Suggested liquid maximum4.0ft/s",
        "Acceptable interpass conditions retained"
      ]
    },
    {
      "basis": "Assessed no/intermittent-flow method",
      "conditions": [
        "No explosive/flammable mixture and no oxygen ingress must be confirmed, otherwise selected purge",
        "Minimum purge0.4m/s",
        "Suggested liquid maximum1.75m/s with heat-loss testing/procedure response above",
        "Acceptable interpass conditions retained"
      ]
    }
  ],
  "test_media_bases": [
    {
      "basis": "Water-preferred method",
      "conditions": [
        "Water where practical; compatible alternative can avoid annulus water",
        "Gas above7bar gauge only with full risk assessment/mitigation"
      ]
    },
    {
      "basis": "Skin-temperature-limited hydro method",
      "conditions": [
        "Hydrostatic branch test limitedto93Cskin temperature",
        "Nitrogen/helium specified above that condition",
        "Own staged pressure/stabilisation/protection basis"
      ]
    }
  ],
  "test_states": {
    "scope": "One adopted before-cutting sequence; does not replace job procedure.",
    "rows": [
      {
        "test": "Hot-tap valve seal",
        "valve_condition": "Preferably separately mounted to test correct seal",
        "minimum_min": 5,
        "pressure_basis": "Highest run operating pressure possible during operation"
      },
      {
        "test": "Branch strength/leak",
        "valve_condition": "Installed/open",
        "minimum_min": 30,
        "pressure_basis": "Calculated actual-run external differential and branch/code bound"
      },
      {
        "test": "Mounted drilling machine leak",
        "valve_condition": "Valve closed",
        "minimum_min": 5,
        "pressure_basis": "Highest run operating pressure possible during operation"
      }
    ]
  },
  "reduced_branch_fittings": {
    "scope": "Specific connection procedure, excludes vibration and minimumDN25",
    "rows": [
      {
        "application": "on-plot",
        "maximum_DN": 75,
        "maximum_branch_run_diameter_ratio": "1/3"
      },
      {
        "application": "off-plot",
        "maximum_DN": 50,
        "maximum_branch_run_diameter_ratio": "1/4"
      }
    ],
    "diameter_convention": "As adopted connection criterion; not silently equated to internal area diameter."
  },
  "tank_bases": "1m liquid head and3ft criteria remain with their respective material/process/qualification conditions; no stricter-head merge."
}