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Pressure drop for pipes

Calculates the pressure drop per meter in the actual pipe.

Pressure drop for pipes

Input Result
Flow q=
Pipe diameter d= mm
Kinetic viscosity ν= *10-6 m2/s
Density ρ= kg/m3
Material roughness k= mm
Pressure drop Δp= Pa/m
Velocity v= m/s



The liquid flow in the relevant pipe.

Tube diameter

The actual inside diameter of the pipe.

Kinematic viscosity

Specifies how quickly a liquid spreads relative to its mass if it is poured out on a flat surface. In the original case, set to air at 20˚C.

Dynamic viscosity

Are proportionality factor for the force it takes to parallel displace a surface relative to another, if the gap between these surfaces is filled with a viscous liquid or gas.


Density or volume of the mass is an SI unit and is a measure of a specific substance density, ie mass per unit volume. A synonym for density that can sometimes occur is specific gravity.


Pipe pressure drop corresponds to the force required to move the medium in the relevant pipe of 1 meter.

Velocity ​​

The velocity of the medium in the tube.

Material roughness

A material constant that indicates how smooth tube material is.


Hagen-Poiseuille: Hagen-Poiseuille Pressure drop calculation for laminar flow.
Darcy-Weisbach: Darcy-Weisbach Pressure drop calculation for turbulent flow.
Colebrook-White: Colebrook-White
Serghides: Serghides Approxomative solution to Colebrook-White
Serghides paart 1
Serghides part 2
Serghides part 3
Reynolds number: Reynolds number
Dynamic viscosity: Dynamic viscosity