Pressure drop in generic pipeline.

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

User data New Steel Pipe (dim. GAS) New Steel Pipe (dim. UNI) Rusty Steel Pipe (GAS) Rusty Steel Pipe (UNI) Copper Pipe Plastic Pipe (PE100) Plastic Pipe (PP) Plastic Pipe (PVC) Plastic Pipe (PVDF) Rilsan Pipe Glass Pipe Rubber Canvas Pipe Cast iron pipe (internal cement)

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

l/min m³/h

Zone for special applications.
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).

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

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

Fluid characteristics.

Kind of fluid

Water Salt water Gasoline HYCOOL 45 Kerosene Water-glycol 42% Diesel fuel for motor vehicles Diathermic oil ISO VG 32 Hydraulic oil H-LP 32 Oil SAE 30

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

2 2.5 3 4 5

R (mm)

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.