It calculates the pressure drop (or dynamic pressure drop)
of a piece of pipe 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

Pipe characteristic.

Selection of pipe kind

Absolute roughness of the inner wall

mm

Selection of pipe dimensions

The outer diameter is used for the definition of the ratio R/D, not is used to calculate the pressure drop and is **not checked.**

Pipe dimensions

**Øe** (mm)

**Øi** (mm)

Velocity of the fluid.

Required flow rate

To obtain low pressure drop, low noise in case of long pipelines, or viscous fluids with a viscosity very variable, in order to limit the pressure surges (water hammer).

Installations for civil, irrigation, waterworks, industrial plants of transfer, cooling systems or heating.

Transfer sludge, transport fluids with particles in suspension, high pressure systems, economic systems, short sections of piping.

Fluid characteristics.

Kind of fluid

Working temperature of the fluid

ºC

Viscosity of the fluid

cSt

ºE

Density of the fluid

kg/l

Circuit components.

Rectilinear pipe length

m

Angle joints

n.

90º elbow joint

n.

Bend with big radius

n.

Ratio R/D

R (mm)

Results | |||

Fluid velocity in the pipe | m/s | ||

Relative roughness in the inner wall | r/d | ||

Reynolds number | |||

Friction coefficient (Colebrook Whine) | |||

Resultant dynamic pressure drop | kg/cm^{2} |

**Notes.**

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).

For angle joints are meant joints with not started fluid (without coving).

For 90 degrees joints are meant the elbow joints.

Instructions

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Notices

The apps about pressure drop.

For air and other kind of gases,

(round pipe).

(round pipe).

For air and other kind of gases,

(squared or rectangular channel).

(squared or rectangular channel).

For fluid at liquid state,

(general hydraulic plants).

(general hydraulic plants).

Specific for oleodynamic plants.

Emptying time for a tank.