Alfa Laval ALTB Top Mounted Agitator
The Alfa Laval ALTB top-mounted agitator is available in a variety of sizes to fit both atmospheric and pressurised tanks. The inclusion of a bottom support stabilises the shaft and assures its consistent operation. You can expect excellent power usage because to the wide range of size possibilities. ALTB agitators are designed for simple CIP and can be adjusted for usage in sterile/aseptic environments.
We provide variants for sterile/aseptic applications as well as optional equipment for all ALTB top-mounted agitators, such as a welding flange, a blind flange, a motor/gear cover, and a replacement parts package. Material certificates are available upon request.
Our top-mounted agitator with bottom support ALTB provides the same solutions as the ALT but with greater mechanical freedom. Depending on the size of the agitator, a bottom support may yield a more cost-effective solution. The Alfa Laval bottom support is designed to be sanitary and easy to clean.
Related Industries:
Alumina, Food processing, Beverage processing, Dairy processing, Coal, Copper, Home care, Industrial water and waste treatment, Nickel, Renewable power, Zinc, Thermal power, Uranium
Energy efficient design
Both our EnSaFoil impellers and our custom made EnSaFerm impellers for fermentation use less energy and keep your product from absorbing heat. Their unique shape, which is based on a lot of research into fluid dynamics, makes them up to 400% more efficient than impellers with a normal pitch. Our impellers work at slower speeds without losing any pushing power, which is another way they save energy. So, they lower the power needed by agitators by up to 80% compared to agitators with regular impellers.
Modular and hygienic
Alfa Laval agitators keep things very clean and can be used for a lot of different blending and mixing tasks in processing tanks. Because they are made of clean, modular parts with smooth surfaces, stirrer systems can be easily changed to fit different tank and process needs, such as those set by EHEDG, USDA, FDA, and 3-A.
Simplified service
Alfa Laval agitators are known for having low wear and little upkeep. This means more work gets done because there is less break. For example, long-life seals and joints can be replaced without taking the tank apart or going inside it. It saves time and money this way.
Construction
Based on a modular design, Alfa Laval agitators consist of a drive unit with bearing frame, shaft with special shaft seal arrangement, and bi- or tri-lobe energy-saving airfoil impellers.
Operating principle
An electrical motor (drive unit) transmits the energy required for mixing and blending, either directly or via a gearbox, to the agitator shaft. The shaft rotates, turning the specially designed Energy Saving Foil impellers. The impeller movement creates a high flow with low shear due to the highly effective axial pumping effect on the liquid in the tank. This results in effective mixing and blending of the entire contents of the tank.
Optional equipment
Alfa Laval also offers agitator models for sterile/aseptic applications and optional equipment, including welding flange, blind flange, cover for motor/gear and spare part kit, for its range of agitators.
Standard design
The Alfa Laval range of top mounted propeller agitators with bottom steady bearing is designed to meet almost every customer requirement. Type ALTB agitators are characterised by having a shaft support inside the tank called a bottom steady bearing. Standard type ALTB agitators are less costly than agitators without internal shaft support. Due to their modular build, the agitators can be designed to suit every kind of application within hygienic industry. The modular construction is designed with the aim to meet both European and American standards and regulations, such as EHEDG, USDA, FDA, 3A etc.
Please note that Alfa Laval also offer other agitator solutions:
– Type ALT, top mounted agitators
– Type ALS, side mounted agitators
– Type ALB, bottom mounted agitators
For more information please see separate Product Data Sheets.
Configurable design
Type ALTB agitator design is fully configurable divided in the following
elements:
– Drives (drive + shaft support + shaft diameter)
– Seal arrangements (oil trap + shaft seal type)
– Shaft (length)
– Energy Saving Foils (propeller type + surface finish)
– Bottom steady bearings (type + surface finish)
– Options
Each element has a broad range of different characteristics which make it possible to size the agitator for all applications and requirements. Type ALTB configuration, please see next page.
TECHNICAL DATA
Motor
Motor size and speed as required for duty. As standard with IEC motor IP55, other types on request. As standard painted RAL5010. Voltage and frequency As standard for 3×380 to 420V, 50Hz – 3x440V to 480V, 60Hz. All motor voltages and frequencies are available.
Gears
Different gear types available according to configuration. As standard filled with normal synthetic or mineral oil, optional: Food approved oil. As standard painted RAL5010.
ATEX – option
Agitators can be delivered approved for use in an ATEX environment with declaration of conformity.
Ordering
The following information is required to ensure correct sizing and
configuration for ordering:
– Tank geometry
– Product properties
– Task of agitator
– Enquiry forms are available
PHYSICAL DESIGN
Materials
Available materials:
Steel parts:
AISI 316L (standard)
AISI 304
AISI 904L
SAF 2205
Other materials on request.
Seal rubber parts
(O-rings or bellows):
EPDM
FPM/FEP (only for stationary
o-rings)
FPM
Other materials on request.
Mechanical seal parts:
Carbon
Carbon (FDA)
Silicon carbide
Wear bushings
(bottom steady bearing): . . . . . . . . . . PTFE (BS1P/BS1G)
PVDF (BS2P)
Material certificate – option
.1 Material certificates/FDA conformity statement according to 21 CFR177 on steel/elastomer parts in contact with media
Dimensions
Standard propeller diameter range: ø125 mm to 1900 mm. Specific dimensions on the drive unit and propeller(s) will depend on the actual configuration selected.