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Pressure loss

Pressure loss (pL) is a pressure difference caused by wall friction (in pipes) and resistances (in valves, fittings etc.). It is calculated on the basis of the head loss (HL) which is independent of the density (ρ), using the following equation:


ρ    Density in kg/m³
g    Acceleration due to gravity (9.81 m/s²)
HL  Head loss in m
pL  Pressure loss in Pa (1 bar = 100,000 Pa)