Friction Loss Calculator: Compute Pressure Drop & Head Loss in Pipes

Calculate Your Pipe Friction Loss

Understanding and calculating friction loss is crucial for efficient fluid system design. Our powerful online Friction Loss Calculator simplifies determining pressure drop and head loss in pipes, a key factor in hydraulic engineering. Easily input pipe dimensions, fluid properties, and flow rates for accurate results.

Formula:

Darcy-Weisbach Equation for Head Loss:

hf = f * (L / D) * (v2 / 2g)

Where:

  • hf = Head loss due to friction (meters or feet)
  • f = Darcy friction factor (dimensionless)
  • L = Length of pipe (meters or feet)
  • D = Inner diameter of pipe (meters or feet)
  • v = Average fluid velocity (meters/second or feet/second)
  • g = Acceleration due to gravity (9.81 m/s2 or 32.2 ft/s2)

To calculate f (Darcy Friction Factor) for turbulent flow (using Swamee-Jain equation):

f = 0.25 / [log10((ε / 3.7D) + (5.74 / Re0.9))]2

Where:

  • ε = Pipe roughness (meters or feet)
  • Re = Reynolds Number (dimensionless)

Reynolds Number:

Re = (ρ * v * D) / μ

Where:

  • ρ = Fluid density (kg/m3 or lb/ft3)
  • μ = Dynamic viscosity (Pa·s or lb/(ft·s))

Fluid Velocity:

v = Q / A = 4Q / (πD2)

Where:

  • Q = Volumetric flow rate (m3/s or ft3/s)
  • A = Cross-sectional area of pipe = π * (D/2)2 (m2 or ft2)

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