: Accounts for pressure drops in valves and fittings using the Equivalent Length Recommended Velocities
Note: For $f$, the Moody Chart or Colebrook-White equation is used, accounting for pipe roughness ($\epsilon$). : Accounts for pressure drops in valves and
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The primary equation for frictional pressure drop is: or specific code requirements
The most accurate method for calculating frictional pressure drop in fully developed pipe flow is the Darcy-Weisbach equation:
Establish operating density, viscosity, temperature, and design pressure.
Ensure your selected pipe schedule meets or exceeds both hydraulic flow constraints and pressure rating constraints.