{
  "schema": "authored-utility-methods/v1",
  "fuel_temperature": {
    "hypothetical_dewpoint_C": 10,
    "same_relevant_delivered_pressure_composition": true,
    "selected_turbine_margin_K": 20,
    "selected_turbine_minimum_C": 30,
    "selected_refinery_LPG_condensation_margin_K": 5,
    "selected_refinery_minimum_C": 15,
    "scope": "Different selected consumer/condensation routes; no interchangeable generic margin; remove formed primary liquid before downstream gas heating."
  },
  "residue_return": {
    "quantities": {
      "Qc": "Consumption, m³/h",
      "Qr": "Return, m³/h",
      "Qp": "Pumped flow, m³/h; Qc+Qr"
    },
    "common_temperature_density_basis": true,
    "hypothetical_Qc_m3h": 80,
    "ordinary": {
      "criterion": "Qr≥0.20Qp",
      "minimum_Qr_m3h": 20,
      "minimum_Qp_m3h": 100
    },
    "asphalt": {
      "criterion": "Qr≥Qc",
      "minimum_Qr_m3h": 80,
      "minimum_Qp_m3h": 160,
      "thermal_check": "Return within20°C of heater outlet",
      "additional_checks": "Selected initial guidance1m/s minimum circulation velocity; maintain turbulent flow under circulation-pump method; branch regime/heat loss not proved by volume balance."
    },
    "thermal_chain_example_C": {
      "typical_film_ceiling": 330,
      "bulk_outlet_about": 300,
      "distribution_loss_up_to": 20,
      "burner_about": 280
    },
    "limits": "Thermal values are linked selected-method guidance, not universal residue limits; actual origin/processing/history and viscosity-temperature/blend stability govern."
  },
  "HTF_suction": {
    "expression": "NPSHa=(pvessel_abs−pvap_abs)/(rho*g)+z−hL",
    "quantities": {
      "pvessel_abs": "Vessel surface absolute pressure, Pa",
      "pvap_abs": "Fluid vapour absolute pressure, Pa",
      "rho": "Liquid density, kg/m³",
      "g": "Gravitational acceleration, m/s²",
      "z": "Surface elevation above pump reference, m",
      "hL": "Suction-path loss, m of liquid",
      "NPSHa": "Available head, m of liquid"
    },
    "adopted_premise": "At normal operating temperature, aged/degraded/absorbed-material HTF assessed with pvap_abs=pvessel_abs",
    "hypothetical": {
      "z_m": 6,
      "hL_m": 1.5,
      "pressure_head_m": 0,
      "NPSHa_m": 4.5
    },
    "limits": "No required pump NPSH, margin, actual properties or project acceptance. Equal-pressure premise is an adopted uncertainty assessment, not a universal vapour-pressure law."
  }
}