Product Theme

INDUSTRIAL FANS & BLOWERS

Wesman is an independent designer and manufacturer of Industrial Fans and Blowers over the last five decades and has thousands of fans and blower in operation in India and other countries.

Wesman maintains strict quality procedure in design, manufacturing and testing. The centrifugal fan is the heart of any thermal system. If the Fan does not deliver required pressure and volume then the combustion is incomplete. This will cause un-burnt fuel particles to escape along with flue gas. The consequence will be enhanced pollution and increase in operating cost of the plant. Wesman designs and manufactures fans for wide range of pressure, direction of discharge and power to suit customer requirement. Many of the blowers in varying capacities are available in standard specifications. However, Wesman specializes in offering one-off tailor made designs as well to suit customer specifications.

Fans are manufactured with different impeller configuration as per application


CONFIGURATION OF IMPELLER BLADES


Based on application Wesman design and manufacture impellers with following blade configuration

• STRAIGHT BLADE
• BACKWARD CURVED
• FORWARD CURVED

STRAIGHT BLADE IMPELLER

With this type of impeller, the blade is straight. The impeller design is simple. Fan will have 50 – 75% efficiency. This can be used for high pressure / low volume application. It is more suitable for dust laden atmosphere. However, the fan generates more noise, vibration and shows rising power requirement with volume like forward curved impeller

 

BACKWARD CURVED IMPELLER

With this type of impeller, the curved blade meets at outer diameter of the impeller in a drawn away position opposite to direction of motion. The impeller has a load limiting capacity. The pressure generated by the fan automatically drops down when volume more than design value is drawn from the blower . Accordingly, the overloading of the motor is avoided. Fans will have higher efficiency (80% or more). This fans can be used for low pressure / high volume application. It is typically used for a static pressure upto 20 inch (500 mm) water column.


FORWARD CURVED IMPELLER

With this type of impeller, the curved blade meets at outer diameter of the impeller in a drawn in position in direction of motion. The fan has relatively lower efficiency (60 – 70%). The impeller blades are smaller compared to backward curved blade but more in number and with higher curvature. The fan can operate at low speed and is less noisy in operation.


LOW PRESSURE FAN

Wesman design and manufactures centrifugal fan from 2 to 24 inch (50 to 600 mm) WC static pressure. The HP for these fans vary from 2 to 60 HP (1.5 to 45 KW).

 

HOT AIR FAN

Wesman design and manufactures centrifugal fan for handling hot air upto 600 deg C. The casing and impellers are made of stainless steel.






COMBUSTION AIR BLOWER


Wesman design and manufactures centrifugal fan from 26 to 60 inch (650 to 1500 mm) WC static pressure. The HP for these fans vary from 2 to 150 HP (1.5 to 110 KW).


MANUFACTURING

All the components such as impeller, casing, diffuser etc are manufactured with strict manufacturing norms. Quality control starts from raw material stage and continues through out the process. Impellers are made from mild steel, stainless steel or boiler quality plates as per the application or custom requirement. Casing is made from mild steel or stainless steel as per requirement. Both static and dynamic balancing is done for impellers. Stage inspection is carried out at various stages of manufacturing. After total assembly and final inspection all fans are tested in a test bed. The test bed is equipped with modern instruments for measurement of pressure, volume, power, etc. All data are simultaneously logged in the computer which is hooked up to a PLC/VVFD system. Through VVFD the fan under test can be run at different speed to find out the performance of the fan at speed other than design speed. This will be particularly for necessary for high temperature application. Vibration and noise level is also checked through specific instruments. After acceptance of test result the fans are painted with final paints as per Wesman paint scheme or customer color request.
Various drive arrangement such as Fan directly mounted on motor shaft, coupling drive, V- belt drive are offered as per requirement. Also various arrangement of clockwise / anti-clockwise discharge with custom direction are offered to suit with site condition.


TYPICAL APPLICATIONS


Wesman blower have been in use in the following areas (not exhaustive)

• Aluminum melting & holding
• Steel plant
• Ferro- Alloys
• Sponge Iron plant
• Ceramic industries
• Ammonia recovery plant
• Biscuit/Tea/Food processing manufacturing

Wesman design and manufactures centrifugal fan for handling hot air upto 600 deg C. The casing and impellers are made of stainless steel.

 

INLET FILTER WITH SILENCER

In dust laden areas, inlet filters are recommended so that the fan can suck clean air and discharge at elevated pressure. This will prevent undue clogging of various devices connected in the up-steam of the fan and reduce maintenance. Silencers can be provided to reduce the noise level of the blower. Wesman designs and manufactures inlet filters with silencers as per discharge of the fan.

MULTIVANE DAMPER

Multi-vane damper fitted at the inlet of the fan are used for smooth start up of the fan and pressure control during normal operation. These comes with manual and automatic version in various diameters for different capacities.

VIBRATION ISOLATOR

In order to reduce the vibration level at site the fan can be supplied with vibration isolator.

ACCOUSTIC CLADDING

In order to reduce the noise level of the fan substantially, acoustic cladding is recommended. This is done though by wrapping casing with suitable material such as glass wool etc. and finally cladding with aluminum foils.





WESMAN GROUP brings cutting-edge technologies to its customers