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Pipe Pressure Loss
Compute Re, friction factor, and pressure loss via Darcy-Weisbach.
Calculator tabs
Darcy–Weisbach hesaplaması
Akışkan özellikleri, debi ve boru verilerini girerek basınç kaybını gör.
Results
Flow regime, friction factor, and straight-pipe pressure loss.
Area A (m²)
0.001963
Re
254,139
f
0.0205
Relative roughness ε/D
0.000900
Flow regime
Turbulent
Swamee-Jain
DeltaP (kPa)
159.2
DeltaP (bar)
1.592
Pump power, η=70% (kW)
2.27
Head loss (m)
16.262
Hız (m/s)
5.09
Formula and variables
Formulas used
A = pi * D^2 / 4
v = Q / A
Re = rho * v * D / mu
f = 64 / Re (laminar)
f = 0.25 / [log10(eps/3.7D + 5.74/Re^0.9)]^2 (Swamee-Jain)
DeltaP = f * (L/D) * (rho v^2 / 2)
Variables
- rho
- Yoğunluk (kg/m3).
- mu
- Viskozite (Pa·s).
- Q
- Debi (m3/s).
- D
- İç çap (m).
- L
- Hat uzunluğu (m).
Usage notes
- Re < 2300 is laminar; 2300-4000 is transition; Re > 4000 is turbulent.
- Minor losses are excluded; add ΔPminor = Ktotal·ρ·v²/2 separately.
- Pump power assumes 70% efficiency.
Show reports, charts, and comparison tools
After checking the basic result, open sharing, PDF, method notes, and comparison panels.
Tool-Specific Documentation
Pipe Pressure LossScope: What does this tool calculate?
Calculates Reynolds number, friction factor, and pressure loss for internal pipe flow.
Assumptions and Units
- The model is based on Darcy-Weisbach; SI units are used (m, kg/s, Pa).
- Fluid properties are treated as constant at selected conditions (quick-check assumption).
- Roughness, diameter, and length inputs follow straight-pipe segment logic.
Limits / Boundaries
- Multiphase flow, abrupt expansion/contraction, and local losses are limited in this baseline model.
- High-temperature viscosity shifts and compressibility effects require additional verification.
Applicable References
- Darcy-Weisbach approach
- EN ISO 5167 (flow/measurement reference)
- VDI 2048 (application notes)
Validation Example
Water line quick check
| Input | Expected Output |
|---|---|
| Q=2.0 L/s, D=50 mm, L=20 m, roughness=0.045 mm | Re > 4000, pressure drop around 8-15 kPa |
Note: For real systems, include local loss coefficients (elbows, valves).
Version and Update
- Version
- v1.0.0
- Last updated
- 2026-03-04
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