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  "assumptions": [
    "90° elbow tap meter: Q = C A √(2Δp/ρ); C=√((R/D)/2); A=(π/4)D²; inner/outer radius taps; incompressible; C is reported, not an input",
    "R/D∈[1.0, 3.0]; D∈[25 mm, 600 mm]; 90° only; C from R/D, not a given Pitot C=1",
    "Not pipe-bend K=0.21 (θ/90)/√(R/D), not Pitot v=C√(2Δp/ρ), not venturi, not ISO 5167-6 wedge, not Q=Av, not Darcy f"
  ],
  "limitations": [
    "90° elbow tap meter: Q = C A √(2Δp/ρ); C=√((R/D)/2); A=(π/4)D²; inner/outer radius taps; incompressible; C is reported, not an input",
    "R/D∈[1.0, 3.0]; D∈[25 mm, 600 mm]; 90° only; C from R/D, not a given Pitot C=1",
    "Not pipe-bend K=0.21 (θ/90)/√(R/D), not Pitot v=C√(2Δp/ρ), not venturi, not ISO 5167-6 wedge, not Q=Av, not Darcy f"
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  "boundary_conditions": [
    "missing D, R/rd, Δp, Q, or ρ when required → MISSING_REQUIRED_INPUT",
    "D outside [25 mm, 600 mm] or R/D outside [1.0, 3.0] → VALUE_OUT_OF_RANGE",
    "K, θ, C/C_d, A or v, Darcy f, tank H, wedge h, n_miters, β, kind=pitot or kind=bend → MIXED_INPUT_ENCODING",
    "mode=Cd or unknown mode → INVALID_MODE"
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      "title": "ISO 80000-4 — Mechanics",
      "section": "Length, speed, pressure",
      "url": "https://www.iso.org/standard/31895.html",
      "supports": "D and R are lengths; Q is a volume flow; Δp is a pressure",
      "kind": "standard"
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    {
      "title": "Elbow tap meter — centrifugal Δp",
      "section": "C=√((R/D)/2) from inner/outer taps",
      "supports": "Q=C A √(2Δp/ρ) with C=√((R/D)/2); 90° only. Not pipe-bend K, not Pitot C=1, not venturi, not ISO 5167-6 wedge",
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      "ok": true,
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