Hydraulics and sanitation
Pressure pipe head loss (Darcy-Weisbach)
Formulas
V = Q / (π D²/4) ; Re = V D / ν
Re < 2000 : λ = 64/Re ; sinon λ = 0,25 / [log₁₀(ε/(3,7 D) + 5,74/Re^0,9)]² (Swamee-Jain)
ΔH_lin = λ (L/D) V²/(2g) ; ΔH_sing = ΣK V²/(2g)
Assumptions
- Water at ~20 °C (ν ≈ 1.004×10⁻⁶ m²/s). Swamee-Jain matches Colebrook-White within ~1% for 10⁻⁶ ≤ ε/D ≤ 10⁻² and 5,000 ≤ Re ≤ 10⁸. Transition zone (2000–4000) is uncertain.
Pressure pipe head loss (Darcy-Weisbach)
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These tools provide estimates and calculation aids. They are neither design calculations nor an engineering approval: any design or safety decision must be checked by a qualified professional against the applicable standards.
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