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Pressure drop in oleodynamic pipes.

Piece of an hydraulic system

It calculates the pressure drop (or dynamic pressure drop) of a piece of oleodynamic system with constant section.
For circuits composed of multiple traits in series with different sections is necessary calculate them separately and sum the results related to each section.

Data input
Characteristic of the pipe.

Kind of pipe

Wait pipe list.

Pipe dimension

Wait pipe dimension.

Øe (mm)

Øi (mm)

Absolute roughness of the inner wall


Selection of circuit topology.
Waste pipe
Long lines
Piece of the oleodynamic system considered.
Fluid velocity.

Required flow rate

l min

Normal zone for critical or low temperature applications.
Normal zone for generical applications.
Normal zone for cheap applications.
Fluids characteristics.

Kind of fluid

Working temperature of fluid

Wait fluid temperature


Fluid viscosity



Fluid density


Circuit components.
Linear pipe with big radius bend.

Linear pipe length


Angle joints.

90° joints


Curves derived from a bent pipe.

Curves derived from a bent pipe


Ratio R/D

R (mm)

Wait calculate

Fluid velocity in the pipe m/s
Relative roughness of the inner wall r/d
Reynolds number
Friction coefficient (Colebrook Whine)
Resultant dynamic pressure drop kg/cm2

Selection of the kind of circuit is useful to indicate the useful field for each application avoiding undesiderable effects such as back pressure at drain pipe, cavitation at suction pipe or accentuated noise on the sending pipe.

Joint with an R/D ratio higher than the maximum avaiable can be neglected (add the development of the joint on the length of the pipe).

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The apps about pressure drop.

For air and other kind of gases,
(round pipe).
For air and other kind of gases,
(squared or rectangular channel).
For fluid at liquid state,
(general hydraulic plants).
Specific for oleodynamic plants.
Emptying time for a tank.