// multi-utility computation suite · offline · instant · precise
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sci.pipe-head-loss-Darcy Calculator
Calculates pipe head loss using the Darcy-Weisbach equation: h_L = f × (L/D) × v²/(2g), with friction factor from the Moody chart or Colebrook equation. For fully turbulent flow in rough pipes, f depends only on relative roughness ε/D — commercial steel pipe has ε = 0.046 mm, giving f ≈ 0.02 at large Re.
Inputs
L M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
D Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
V M S
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
F Darcy
A multiplier applied in the calculation.
Rho Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Results
head loss hf (m)
The decrease or degradation from the baseline.
pressure drop ΔP (kPa)
Pressure lost to friction as fluid moves through the pipe or system. Higher drop = more pumping power required. Reduce by using larger pipes, fewer bends, or lower flow velocity.
hf = f·L·v²/(D·2g)
Reference formula or conversion factor shown for context.
Re (for water at 20°C)
The value at the specified point or condition.
moody chart
Reference formula or conversion factor shown for context.