How To Buy Centrifugal Fans
Centrifugal fans are built to be rugged, and are designed with different shapes of blades
. They can range in diameter from 200mm to over 5 meters, and the configuration of the blades determines the operation of the fan.
Centrifugal fans may often resemble a paddle wheel and are sometimes referred, to as a squirrel cage. The air enters close to the centre of the wheel, and is turned 90 degrees, and then moves radically outward due to the centrifugal force that is created between the blades of the spinning impeller. The blades can be curved in a convex or concave design, in regard to the direction in which the rotation occurs, or they can be straight. Each design produces a distinctive performance. In order to determine the most suitable design of the centrifugal fans, there should be accurate measurements of the pressures and volumes of air that must be displaced in ventilation systems.
Finding a suitable fan will often entail searching through the catalogues created by the manufacturers of centrifugal fans. Since some customization may be necessary, contacting several companies are asking for quotations or inviting them to submit tenders for construction and installation of the fans, may be a more efficient process. However, additional information, such the pressures and volumes, must be provided, for more complete and appropriate tenders. Information should include temperatures, barometric pressures, humidities and, air densities.
In many situations, there are strict restrictions on the level of noise, that can be produced by the fans. Compliance to the restrictions is necessary, even if the fans are installed underground, and noise levels must be quantified. You may need to provide a plan that shows the proposed location of the fan along with any restriction in the use of space.
When submitting the request for tender, all the quantities and concentrations of pollutants that will be handled by the fan must be clearly identified. They will often include materials such as gases, dust water vapour, and drops of water. Materials of any corrosive nature must also be clearly indicated. You can also indicate preferences for any materials in the manufacture of the impellers and housing assemblies, and you should also specify the type protective coatings or paints to be used in the process or protect.
If you have successfully completed all required back ground work, you may be in a position to specify the type of fan that would be most suited, however, the manufacturer can be asked to propose a suitable solution. The tender should be wide enough in scope to cover all the required aspects, that can include supplying and installation, as well as commissioning the new fan. Each item should be individually priced.
Installation and operation of the fan will require a transmission, motor, monitoring devices, and electrical accessories. These can either be included in the tenders, or they can be separately obtained. There may also be some restrictions on the voltage and available power that can be used in operation of the fans, and these should be clearly indicated. It may also require the use and installation of transformers for proper operation, this issue must also be addressed.
There are many different issued that should be addressed in the purchasing of
centrifugal fan. It is always better to seek professional guidance when determining which of the
centrifugal fan is best suited for your purpose.
by: ador talukdar
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