A centrifugal fan refers to a mechanical device that is used to move air as well as other gases. “Squirrel cage fan” and “blower” are oftentimes used to refer to centrifugal fan due to the fact that they look like a hamster wheel frequently. Centrifugal fans are used to raise air stream speed through the rotating impellers in them.


Special Fans

We manufacture fans from the following list of materials:

  • Mild steel 43a
  • High tensile steel 50 a/b
  • 304/316/321/310 stainless steel
  • Aluminium
  • Aluminium bronze
  • Inconel
  • Incaloy ds
  • Incaloy 800h
  • Hasteloy c276
  • Titanium

Fans can also be lined with:

  • Ectfe (haylar)
  • Rubber (soft and hard)
  • Teflon
  • Ensicote
  • PVC

And for more arduous duties we offer:

  • X-rays of all butt welds
  • NDT of impellers
  • Hydrostatic testing
  • Overspeed testing
  • Performance testing

Centrifugal blowers speed up air outward, changing the direction typically by 90-degrees of the airflow. They are quiet, sturdy, reliable, and have the ability to perform extremely well in a wide range of conditions. These important machines make use of kinetic energy that is produced in their rotating blade or impellers to speed up the pressure of the gas or air stream. The energy helps move them against any resistance that is brought about by dampers, ducts as well as other components.

The fans are constant volume devices or constant displacement devices and this means that, at a steady fan speed, a squirrel cage fan will pump a steady volume of air as opposed to a steady mass. This goes to means that the velocity of air in a system is constant even if the mass flow rate via the blower is not. The blower fan is regarded as one of the most commonly used fans today. As a matter of fact, these fans are undoubtedly the most common type of blowers used in the Heating, Ventilation and Air Condition (HVAC) sector today. A squirrel cage fan is not a positive displacement device. The fans have come with certain pros as well as cons when compared with positive displacement fans.

Non Destructive Testing

Penetrant Testing

Penetrant testing provides a means of detecting discontinuities which are open to the surface and difficult to observe by visual examination.

Using a water washable process penetrant inspection is very versatile and is not restricted in any way by the geometry of the components under examination. The process is suitable for inspection of suspect local areas and large volume production inspection.

In addition to our factory facilities on-site penetrant inspections can be carried out by utilising the aerosol container technique.


Radiographic Inspection

Our radiographic equipment, both X-ray and Gamma-ray, is capable of penetrating steel up to a depth of 2 inches and aluminium to a depth of 8 inches over normal exposure times.

The equipment can also be used on a wide spectrum of ferrous and non-ferrous materials including plastics, rubbers and carbon fibres.

Ultrasonic Inspection

Sound waves are employed for the examination of materials. These waves possess properties very similar to visible light. They can be refracted, focused and reflected.

Ultrasonic inspection is ideally suited to the detection of imperfections in thicker sections of materials where radiographic examination may be impractical.

Typical applications:

  • Lamination and wall thickness checks
  • Weld examination checks
  • Raw material surveys
  • Avoids creating the hazards of radiation, which occur when using Gamma and X-Ray Radiation.

Magnetic Particle Inspection

Magnetic particle inspection is a method for detecting surface discontinuities in ferro-magnetic materials.

The component under test is first magnetised then a magnetic ink is applied to the area to be inspected and the resulting pattern evaluated.

A centrifugal blower comes with a fan wheel that is made up of several fan ribs, or blades fitted around a hub. The hub turns on a drive-shaft which passes via the fan casing. The air enters from the fan wheel’s side, makes a 90 and then speeds up due to the extreme centrifugal force, hence flowing over the fan ribs and exiting the fan casing.

When one blower cannot afford the necessary pressure and flow, the blowers must be run in a series two or more, to achieve the goal. The centrifugal fan’s pressure is quite high, thus it is greatly used in production and comes with a high using frequency. The centrifugal blowers in series are commonly used in practical production. Based on relevant statistics, fan power consumption accounts for 12 percent of the overall electricity consumption in the US as well as other first world countries.

These fans tend be more affordable when compared to axial fans, and are also very simple to use in construction. A centrifugal blower is used in moving materials more so gases in ventilation systems for buildings. In addition, they are ideal for air pollution control systems and industrial processes.

Project experience size ranges from 1000-1.1 million CFM. Basically, when searching for a blower most end-users are more concerned with the rev per minute of the fan ribs, the fixed pressure rating, cost, delivery time and efficiency rating. Various applications call for users to maintain high quality of their fans in order to prevent breakdown issues.