L_{eq} is the length of pipe with
diameter (D) and friction factor (f) having the same energy loss
as a fitting (valve, elbow,etc.) with minor loss coefficient (K).

To: LMNO Engineering home page Unit Conversions Trouble viewing or printing?

Equation (from the references listed under Discussion and References for Closed Conduit Flow):

f and K are unit-less. D and L_{eq} have the same units. For
instance: If D is in meters, then L_{eq} is in meters. If D is in inches, then L_{eq}
is in inches. If D is in ft, then L_{eq} is in ft.

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(modified January 10, 2013 - added text discussing units for f, K, D,
and L_{eq})