Flebu Marine - Centrifugal Fans, Impellers and Axial Fans for Marine Applications

Flebu International AS is a leading manufacturer and supplier of blowers, high pressure and heavy-duty industrial fans and air and flue gas cleaning systems. We provide a comprehensive range of tailor made solutions, products and services for a variety of application areas.

Flebu Marine's mission is to provide products and services to the international merchant fleet and shipbuilding industry which improve ship management efficiency, reduce operational costs and promote the environment and the safety at sea. Flebu Marine offers:

• Air and gas fans for inert gas systems
• Induced draft fans for boiler applications
• Combustion and cooling air fans for incinerators
• Air and gas fans for exhaust / flue gas cleaning

MARINE CENTRIFUGAL FANS

Flebu fans are a byword in the industry. The product was launched over 50 years ago. Flebu fans are manufactured in a heavy industrial design or in marine versions, and in all steel qualities according to the customer's requirements.

Flebu Marine fans have flow rates of up to 35,000m³/h and pressures up to 40kPa.

IMPELLER MOUNTED DIRECTLY ON MOTOR SHAFT JOURNAL

This arrangement is a compact, reasonable design and requires no transmission journal. However, it must not be used for gas temperatures of over 80°C, places a high load on the front motor bearings, leaves little space for a packing box and has a fixed speed (unless a frequency transformer is used).

IMPELLER MOUNTED BETWEEN THE SHAFT BEARINGS

This arrangement has a stable, robust design, requires no transmission journal and resists high temperatures. It is designed for the very largest fans and has plenty of space for packing box/cooling plates and auxiliary drives. However, it has an expensive shaft, requires demanding design work, a suction box, two packing boxes and an expensive fan and has a fixed speed (unless a frequency transformer is used).

IMPELLER MOUNTED ON FREE SHAFT JOURNAL - BELT DRIVE

This arrangement allows the possibility of varying the fan speed by changing the pulley. Plenty of space is supplied for the packing box/cooling plate and it has a good arrangement in a confined space. However, the transmission journal is belt drive and the shaft must be specially designed if the diameter must be increased, if large motors are used and if the belt forces are high. Also, it requires more maintenance in terms of adjustment/tightening the belt drive and is relatively large.

IMPELLER MOUNTED ON FREE SHAFT JOURNAL - BELT DRIVE ON OBLIQUE PENDULUM

This arrangement allows the possibility of varying the fan speed by replacing the pulley and provides plenty of space for the packing box/cooling plate. However, the transmission journal is belt drive and the shaft must be specially designed and the diameter increased, if necessary, by using large motors and high belt forces. Also, it requires more maintenance in terms of adjustment/tightening of belt drive.

IMPELLER MOUNTED ON FREE SHAFT JOURNAL - DIRECT DRIVE THROUGH CLUTCH

This arrangement features a stable, robust design, no transmission journal, resistance to high temperatures and plenty of space for packing box/cooling plate. However, it is relatively large and operates at a fixed speed (unless a frequency transformer is used).

IMPELLERS

The BK impeller has swept back wings. They are highly efficient and have a "non-overload" characteristic. The power consumption curve is flat in the normal operating range and drops as it approaches free exhaust. The type is not suitable for air/gas with impurities/dust content.

The TR impeller has straight, radial wings that are open, without a front plate. The impeller is self-cleaning and counteracts dust deposits on the wings. The power consumption curve rises as it approaches the free exhaust. The efficiency is relatively low. The type is suitable for air/gas containing dust and for pneumatic conveyor systems.

The TRL impeller has the same profile as the TR impeller but has a front plate which improves efficiency. The impeller is suitable for use at high temperatures.

The BF impeller has swept-back wings which are curved slightly forward, with an almost radial outlet direction. Efficiency is high and the power consumption curve is favourable. The impeller is of the so-called "self-cleaning" type and is ideal for air/gas with a partial dust content. The type is particularly suitable for flue gases and larger areas.