Orifice / venturi flow metering API

Computes flow rate Q = Cd·A2/sqrt(1−β⁴)·sqrt(2·ΔP/ρ) through an orifice plate or venturi from the measured pressure drop, with the diameter ratio β, throat area, velocity-of-approach factor, and throat velocity. Answers 'What flow rate does this orifice/venturi meter read?', 'How do I size a differential-pressure flow meter?'.

Price$0.06per request

MethodPOST

Route/v1/engineering/orifice-venturi-flow

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

engineeringthermofluidsfluidsorificeventuriflow-meterdifferential-pressuredischarge-coefficientmetering

API URLhttps://x402.hexl.dev/v1/engineering/orifice-venturi-flow

Integration docs

Example request

{
  "pipeDiameterM": 0.1,
  "throatDiameterM": 0.05,
  "pressureDropPa": 5000,
  "densityKgM3": 998,
  "dischargeCoefficient": 0.62
}

Example response

{
  "pipeDiameterM": 0.1,
  "throatDiameterM": 0.05,
  "diameterRatioBeta": 0.5,
  "throatAreaM2": 0.001963495,
  "velocityApproachFactor": 1.032796,
  "dischargeCoefficient": 0.62,
  "flowRateM3s": 0.003979886,
  "flowRateLs": 3.979886,
  "throatVelocityMs": 2.026939,
  "formula": "Q = Cd*A2/sqrt(1-β⁴) * sqrt(2*ΔP/ρ), β = d/D",
  "interpretation": "Venturi Cd≈0.98; sharp-edged orifice Cd≈0.6-0.62 (default)."
}

Input schema

{
  "type": "object",
  "required": [
    "pipeDiameterM",
    "throatDiameterM",
    "pressureDropPa",
    "densityKgM3"
  ],
  "properties": {
    "pipeDiameterM": {
      "type": "number",
      "description": "upstream pipe diameter D (m)",
      "examples": [
        0.1
      ]
    },
    "throatDiameterM": {
      "type": "number",
      "description": "orifice/throat diameter d (m)"
    },
    "pressureDropPa": {
      "type": "number",
      "description": "measured pressure drop ΔP (Pa)"
    },
    "densityKgM3": {
      "type": "number",
      "description": "fluid density (kg/m^3)"
    },
    "dischargeCoefficient": {
      "type": "number",
      "description": "Cd (orifice ≈0.62, venturi ≈0.98); default 0.62"
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}