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Pipe Fittings Equivalent Length and K-Factors

Equivalent length (L/D) and loss coefficients (K) for pipe fittings, valves and transitions.

pipefittingsequivalentlength

Overview

Engineering reference data for Pipe Fittings Equivalent Length and K-Factors in piping systems.

Key Formulas

Continuity

A1v1=A2v2A_1 v_1 = A_2 v_2

Mass conservation in pipe flow.

Pressure Drop

ΔP=fLDρv22\Delta P = f \frac{L}{D} \frac{\rho v^2}{2}

Darcy-Weisbach equation.

Pipe Area

A=πD24A = \frac{\pi D^2}{4}

Cross-sectional area of a pipe.

Variables

SymbolDescriptionUnit
DDPipe diameterm
vvFlow velocitym/s
ΔP\Delta PPressure dropPa
ffFriction factor

References