Page 103 - Catalogo de Boquillas - Industrysystem

SYSTEM DESIGN
The piping system that supplies
the nozzles must be designed to LPM / m 2
deliver the correct pressure at the
nozzle inlet. The following formula
Radial Distance (mm)
P Pump = P Nozzle + P Pipe Losses + gh
100000

is useful in estimating the pres
sure a pump will have to supply to LPM / m 2
a nozzle system:
where: Radial Distance (mm)
3
= density of fluid (kg/m )
angle for whirl nozzles tends to Exposing the maximum surface
[water = 1000 kg/m ] decrease as the pressure is increased. area requires breaking the liquid
3
g = 9.81 m/s 2
For additional information see into droplets as small as possible.
h = height of nozzle above
page 124. To get an idea of how this works,
pump (m) - negative if the
imagine a cube of water with a vol
nozzle is below the pump
NOZZLE SPRAY PATTERN ume of 1 m . This cube has a sur
3
p = pressure (bar)
2
The term Spray Pattern face area of 6 m . If we now split it
describes the location and spray in two, we expose some of the
A chart of pipe friction losses is
density of the liquid emitted from inner surface and increase the total
presentedon page 125. In using the
2
a nozzle. Two examples of pattern surface area to 8 m . Atomizing
chart be sure to look at the total
measurement are shown above. the liquid into spheres 1 mm (1,000
system flow if there are multiple
The height of the curve at any microns) in diameter would
nozzles to be supplied by one pipe.
point is the spray density in units increase the surface area of this neering. Engineering. Engineering. Engineering. Engineeri
Elbows, tees and other pipe fit
2
of LPM/m . gallon of liquid to 6000 m . 2
tings (see p. 125) also contribute to
A nozzle actually produces a
pressure loss and can be signifi
DROPLET SIZE range of droplet sizes from the
cant, especially in short, convolu
Droplet size is often critical. Many solid liquid stream. Since it is
ted runs.
processes such as gas scrubbing inconvenient to list all the sizes
SPRAY ANGLE depend on exposing the maximum produced, droplet size (in
The spray angle chosen for a possible amount of liquid surface microns) is usually expressed by a
particular application depends on to a gas stream. Other applica mean or median diameter. An
the coverage required. tions require that the droplets be understanding of diameter terms
The spray angle for spiral noz as large as possible, such as when is essential.
zles is relatively stable over a wide the spray must project into a fast
range of pressures, while the spray moving gas stream.

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