![]() ![]() The friction factor itself is dependent on internal pipe diameter, the internal pipe roughness and the Reynold's number which is in turn calculated from the fluid viscosity, fluid density, fluid velocity and the internal pipe diameter. However to calculate the friction loss in a pipe for example, it is necessary to calculate the friction factor to use in the Darcy-Weisbach equation which determines the overall friction loss. To calculate the pressure loss in a pipe it is necessary to compute a pressure drop, usually in fluid head, for each of the items that cause a change in pressure. Pressure gain due to any fluid head that is added by a pump.Pressure loss due to a change in elevation of the fluid (if the pipe is not horizontal).Friction loss as the fluid passes through any pipe fittings, bends, valves, or components.Friction between adjacent layers of the fluid itself.Friction between the fluid and the wall of the pipe. ![]() ![]() This overall pressure difference across the pipe is related to a number of factors: There may also be a pressure gain/loss due a change in elevation between the start and end of the pipe. When fluid flows through a pipe there will be a pressure drop that occurs as a result of resistance to flow.
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