Pipe Pressure Drop
Friction loss in a full circular pipe with Darcy-Weisbach, plus minor losses from bends and valves. The friction factor is analytical for laminar flow and from Swamee-Jain for turbulent flow.
Total pressure drop Δp0.456bar
- Pressure drop
- 45.63 kPa
- Head loss h_L = Δp / ρg
- 4.66 m H₂O
- Velocity v
- 1.41 m/s
- Reynolds number Re
- 70,454
- Flow regime
- Turbulent
- Friction factor f
- 0.0228
- Friction / minor losses
- 45.63 / 0.00 kPa
- Loss per 100 m
- 45.63 kPa
- v = 1.41 m/s — 0.5–3 m/s recommended for liquids
METHOD
How it is calculated
Re = v·D / ν f = 64 / Re (Re < 2300) f = 0.25 / [log₁₀(ε / 3.7D + 5.74 / Re^0.9)]² (turbulent) Δp = (f·L/D + ΣK) · ρv² / 2
ASSUMPTIONS & NOTES
- Typical K values: 90° elbow 0.3–0.9 · open globe valve 6–10 · gate valve 0.15 · pipe entrance 0.5 · exit 1.0.
- Swamee-Jain is within 1 % of Colebrook (10⁻⁶ < ε/D < 10⁻², 5000 < Re < 10⁸).
- Gas density changes with pressure; split long lines with large losses into sections.
Results are for preliminary design and checking; base the final design on the governing standard and safety factors.
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