Pressure Loss 
Pressure loss. Smooth horizontal pipe. 4000 ≤ Re ≤ 10^{5} 

Pressure Loss Diagram Pressure Loss Equations For steady flow of an incompressible fluid in a constant diameter horizontal pipe using the DarcyWeisbach friction loss equation, the energy equation for flow from location 1 to 2 is expressed in terms of pressure loss as: where:
For pressure loss, the Blasius equation represents the Moody friction factor for smooth pipes and 4000 ≤ Re ≤ 10^{5} (Streeter et al., 1998, p. 291):
Pressure loss unit abbreviations, symbols: kg=kilogram, m=meter, N=Newton, s=second. A=Pipe area.
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