Pipe Pressure Drop Calculator
Calculate pressure drop, head loss, and Reynolds number for pipe flow using the Darcy-Weisbach equation.
Inputs
m
mm
m/s
kg/m³
Results
Total Pressure Drop
90,000 Pa
Head Loss
9.17 m
Reynolds Number100,000
Flow Regime2 (1=laminar, 2=turbulent)
How to Use This Calculator
- Enter the Pipe Length in meters and the Pipe Inner Diameter in mm.
- Enter the Flow Velocity in m/s — typical process piping velocities are 1–3 m/s for liquids and 10–30 m/s for gases.
- Enter the Fluid Density in kg/m³: water ≈ 1000, air at ambient ≈ 1.2, typical process oils ≈ 850.
- Enter the Darcy Friction Factor — for fully turbulent flow use the Moody chart or Colebrook equation; turbulent flow values typically range from 0.01–0.05.
- Enter the Total Fittings K-Factor — sum the K values for all valves, elbows, tees, and reducers from the K-method tables.
- Read the Total Pressure Drop in Pa and Head Loss in m, and confirm the Reynolds Number to verify the assumed flow regime.
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