Calculation of pressure drops of flowing liquids and gases in pipes and pipe elements (laminar and turbulent flow). New version of Online Calculator is available: www.pressure-drop.online

Pressure drop in pipes is caused by: Friction ; Vertical pipe difference or elevation ; Changes of kinetic energy ; Calculation of pressure drop caused by friction in circular pipes ; To determine the fluid (liquid or gas) pressure drop along a pipe or pipe component, the following calculations, in the following order.

Pressure and flow in pipelines are two important parameters for industrial processes. Pressure or differential pressure, flow rate, and pipe diameter are all related. For example, Bernoulli equation, Poiseuille equation, etc., all try to sort out the relationship between pipeline flow, pressure, and pipe diameter.

The Darcy Weisbach equation is used to determine the pressure drop across a pipe for a fluid. Mathematically this is: ΔP = (f × L × V² × ρ) / (2 × D) where P is pressure, f is friction factor, L is pipe length, V is flow velocity, D is pipe diameter, and ρ is the fluid density.

The larger the velocity, the smaller is the pipe size and hence lower is the pipe cost. However, the selection of a suitable velocity is governed by the following system requirements. 1) Pressure Drop: a) The calculated pipeline pressure drop should be within the system permissible limits.