Pipe Friction Example
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 Pipe Pressure Loss Calculator Wall drag and changes in height lead to pressure drops in pipe fluid flow. To calculate the pressure drop and flowrates in a section of uniform pipe running from Point A to Point B, enter the parameters below. The pipe is assumed to be relatively straight (no sharp bends), such that changes in pressure are due mostly to elevation changes and wall friction. (The default calculation is for a smooth horizontal pipe carrying water, with answers rounded to 3 significant figures.) Note that a positive Dz means that B is higher than A, whereas a negative Dz means that B is lower than A.
Inputs
 Pressure at A (absolute): Pa psi atm inHg inH2O ftH2O kPa Mpa mmHg Average fluid velocity in pipe, V: m/s cm/s ft/s mph in/s Pipe diameter, D: m in ft cm Pipe relative roughness, e/D: m/m in/in Pipe length from A to B, L: m in ft cm km mi Elevation gain from A to B, Dz: m in ft cm Fluid density, r: kg/m^3 lb/in^3 kg/l Fluid viscosity (dynamic), m: cP Pa-s kg/m-s slug/ft-s