Pipe Engineering Calculators | GrowMechanical
Flow • Velocity • Diameter • Reynolds • Darcy–Weisbach Friction
Pipe Flow Rate Calculator
mm
m/s
Result will appear here…
Tip: Keep v within typical plant ranges (Liquids: 1–3 m/s, Gases: 10–20 m/s) to manage erosion & noise.
What it does
Computes volumetric flow using measured/assumed velocity and pipe diameter. Ideal for quick line checks and pump tie-ins.
- Handles SI/US units
- Shows area used internally
- Copy result & print
Pipe Velocity Calculator
mm
m³/h
Result will appear here…
Good practice ranges
Liquid lines typically target 1–3 m/s; viscous or erosion-sensitive services go lower. Gas lines often run higher; check noise & critical Mach limits.
Pipe Diameter Sizing
m³/h
m/s
Result will appear here…
Round up to nearest standard nominal size per your piping spec & pressure rating.
Why velocity first?
Picking an acceptable velocity controls noise, erosion, and pumping power—then diameter follows directly.
Reynolds Number
mm
m/s
kg/m³
Use Pa·s or cP for dynamic μ, or m²/s for kinematic ν
Result will appear here…
Regimes: Laminar < 2300 Transition 2300–4000 Turbulent > 4000
Temperature effects
Viscosity drops with temperature—always use process-temperature properties for accurate Re.
Friction Factor (Darcy–Weisbach)
mm
m/s
kg/m³
Dynamic viscosity μ
mm (e.g., CS commercial ~0.045 mm)
m — for head loss
Result will appear here…
Head loss: hf = f·(L/D)·v²/(2g). Add fittings (K-values) separately as needed.
Correlation
For turbulent flow, the Swamee–Jain explicit form avoids Colebrook iterations with excellent accuracy for engineering use.
