{
  "title": "Individual and aggregate leakage answer different questions",
  "scope": "Scoped commissioning nitrogen/helium procedure: stated suitability for lethal service (including H₂S), separately for hydrocarbon systems above Class 300. The 50/40 normal-hydrocarbon criteria below apply within that adopted above-Class-300 route. This does not forbid another qualified lower-class tracer procedure, establish universal acceptance or replace primary proof. Teaching inputs are hypothetical.",
  "units": "standard ft³/year; standard-volume reference conditions belong to measurement procedure",
  "mixture": {
    "system": "99% nitrogen / 1% helium; verify actual mixture and calibrate against certified sample",
    "distinct_component_guideline": "10% helium calibration has a different purpose and cannot be substituted"
  },
  "criteria": {
    "individual_max": 50,
    "system_average_max": 40,
    "rounded_metric_standard_m3_per_year": [
      1.416,
      1.133
    ],
    "denominator": "Total inspected specified flange joints and valve packings",
    "lethal_zero": "Result under detection procedure, not proof of physical zero in every state",
    "normal_hydrocarbon_applicability": "Hydrocarbon systems above Class 300 under this adopted nitrogen/helium procedure"
  },
  "examples": [
    {
      "rates": [
        45,
        45,
        45
      ],
      "average": 45,
      "individual_condition": true,
      "aggregate_condition": false,
      "both": false
    },
    {
      "rates": [
        60,
        10,
        10
      ],
      "average": 26.666666666666668,
      "individual_condition": false,
      "aggregate_condition": true,
      "both": false
    }
  ],
  "different_observation": "Existing closed-valve boundary pressure drop and make-up volume/time do not establish external joint or tracer leakage. Boundary permission is not a new-construction leak allowance."
}