Series and parallel connected blower installations are often used to meet performance ranges beyond normal single stage blower capacities.
For systems that require high ststic pressure, and especially high pressure
TOGETHER with high temperature (where standard multi stage, positive
displacement,
screw Jonathan
Allen Jersey , or regenerative type blowers can not be used) series of
single stage centrifugal blowers can be used. Many times additional blower in
the system can be advantageous. For instance, where two blowers are operating in
series and one breaks down, the other may be able to "limp" the system along
while the necessary maintenance is performed. Having on blower continue in
operation can often allow limited production while the other is being repaired.
Also, there are cases where having one blower continue in operation could
prevent or at least minimize system or equipment damage from such things as high
temperature ot contaminated airstreams.
Another advantage of blowers in series is that of the availbale space. If system must be expanded and increaases
the CFM
requirements Derrius
Guice Jersey , the allotted space for the original blower may not be large
enough for a single large blower, but might be large enough to istall two
smaller blowers in series to obtain the necessary pressure.
One more potentail advatage for series operation is the likehood of initial cost savings.
Although each case must be evaluated individually, it is often more economical
to select two "smaller" blowers with their respectice smaller motors and drives
than to select one "larger" blower to do the job.
Series connected blowers are those which have the outlet of the one blower exhausting into the
inlet of another blower. By connecting blowersa in such a manner, high static
pressures can be attained. This is accomplished as the second blower adds its
pressure capability to the
system Da'Ron
Payne Jersey , increasing the capacity beyond the capabilities of the
first blower.
Ideally, two identical blowers installed in series would result in the same CFM at the outlet of the second blower as the inlet of the
first one, and nearly twice the static pressure as that rated for either blower
alone. However, some variation will result in both air flow and combined
pressure because of the tendency of air to compress under pressure. A good
understanding of how atnoshperic pressure and absolute temperature affect
density is required. Both of these factors are involved in the proper selection
of blowers. Density is directly proportional to atmospheric pressure and is
inversely proportional to absolute temperature (degrees Rankine).
Caution is necessary in selecting blowers for series installtion. It is generally
accepted that most pre-engineered blowers are capable of withstanding twice
their catalog rated static pressure. In other
words Washington Redskins
Hats , where two blowers are installed in series the second blower housing
should withstand the higher pressure. There is, however, a need for concern when
the combined pressure exceeds twice the rated static pressure for one blower. In
series applications involving three or more blowers, or in any system in which
positive or negative pressure exists prior to the consideration of the
blowers Washington Redskins
T-Shirts , special housing reinforcement may be necessary.
For additional information please refer to
http:www.industrialpressureblowerfan.
Oleg Tchetchel
Industrial Process Engineer
Industrial Pressure Blower Co.
http:www.industrialpressureblowerblower
http:www.industrialpressureblowerindex
Greg S Reid Review Greg S Reid Review August 12, 2013 | Author: Giji Muldivan |
Posted in Education
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