Pressure Loss
Pressure loss, abbreviated as \(\Delta P\), also called pressure drop, is the difference in pressure between two points, usually caused by friction resistance in the pipe, but moisture can also affect it.
Pressure Loss formula |
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\(\large{ P_l = \mu \; \left( \frac{ l_p }{ d_h } \right) \; \left( \rho\;\frac{ v^2 }{ 2 } \right) }\) | ||
Symbol | English | Metric |
\(\large{ P_l }\) = pressure loss | \(\large{\frac{lbf}{in^2}}\) | \(\large{Pa}\) |
\(\large{ \rho }\) (Greek symbol rho) = density | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) |
\(\large{ \mu }\) (Greek symbol mu) = friction coefficient | \(\large{ dimensionless }\) | |
\(\large{ d_h }\) = hydraulic diameter | \(\large{ ft }\) | \(\large{ m }\) |
\(\large{ l }\) = lenght of pipe | \(\large{ ft }\) | \(\large{ m }\) |
\(\large{ v }\) = velocity of fluid | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) |
Tags: Pressure Equations