🧮 Pipe Pressure Drop Calculator
Darcy–Weisbach + Churchill friction factor • Fittings via K-values • Roughness by material
1) Fluid & Flow
kg/m³
Water ≈ 998–1000 at 20°C
1 cP = 0.001 Pa·s
°C
Informational (not used directly)
2) Pipe Geometry
Example: 50 mm → 0.05 m
m
Absolute roughness ε (m)
–
Add for items not listed below
3) Fittings / Valves (K-values)
K=0.9 each
K=0.6 each
K=1.8 each
K=0.2
K=10
K=0.3 each
4) Static / Elevation
m
+ve if pumping upward
K
Often K≈1 at open discharge
