The difference in pressure between two points, usually caused by friction resistance in the pipe, but moisture can also affect it. Pressure Drop

A relationship for turbulent flow in commercial steel pipes is:

\Delta P = \frac{Q^{1.8} \mu^{0.2}}{C \cdot d^{4.8} \cdot \rho}

where:

\mathrm{C} is 20,000 for rough carbon steel pipe and 23,000 for smooth tubes.
\Delta P pressure loss due to friction, psi per 100' of pipe
Q is flow rate, lb/hr
\mu Viscosity, cp
\rho, is the density of the fluid, lb/ft3
d is the, In

This assumes that the flow is fully turbulent which can be determined with Reynolds Number. Another method of determining the frictional pressure drop is the Darcy-Weisbach Equation.

Calculator

Retrieved from "http://www.piping-designer.com/Pressure_Drop"
Top of Page