Alfa Laval Top Mounted Agitator Type ALTB

Alfa Laval Tank Agitator - ALTB

Our top mounted agitator with bottom support ALTB offers the same solutions as the ALT but with higher flexibility in mechanical design. Depending on the size of the agitator a bottom support may result in a more economical configuration. The Alfa Laval bottom support comes in sanitary design created for easy CIP.

Application Typical examples
Maintain media homogeneous Milk storage tanks, cream tanks, mixed product tanks, UHT product storage tanks, etc.
Mixing and Solutions (dissolves) Fluid and fluid mixing, i.e. drinking yoghurt and fruit mix tanks, flavoured milk mix tanks, syrup mix tanks, etc.
Solid Dispersion Powder protein + oil mix tanks, micro salt + milk product mix tanks, etc
Suspension Fluids with particles, i.e. juice tanks, crystallising tanks etc
Heat transmission Circulation of media in tanks with dimple jacket (cooling or heating)
Dairy Fermentation (break coagula + mixing) Yoghurt tanks, cheese culture tanks, crème fraîche, etc

Technical Data

Motor
Motor size and speed as required for duty. As standard with IEC motor IP55. Optional: IP66 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 food approved oil. As standard painted RAL5010.

Product wetted surface finish
Industrial, shot peened . . . . . . . . . . Ra < 3.2 µm
Hygienic, polished . . . . . . . . . . . . . Ra < 0.8 µm

Physical Design

Materials
Available materials:
Steel parts: . . . . . . . . . . . . . . . . . . AISI 316L (standard). . . . . Other materials on request.

Seal rubber parts
(O-rings or bellows): . . . . . . . . . . . . EPDM. . . . . FPM. . . . . FPM/FEP (only for stationary O-rings). . . . . Other materials on request.
Mechanical seal parts: . . . . . . . . . . . Carbon. . . . . Carbon (FDA). . . . . Silicon carbide
Wear bushings (on shaft) (bottom steady bearing): . . . . . . . . . . PEEK

Temperature
During operation: . . . . . . . . . . . . . . Max 90 ºC
CIP . . . . . . . . . . . . . . . . . . . . . . . Max. 95 ºC
SIP . . . . . . . . . . . . . . . . . . . . . . . Max. 150 ºC
Pressure Full vacuum – 10 barg (145 psi) depending on configuration.

Material certificate – option
3.1 Material certificates/FDA conformity statement according to 21 CFR177 on steel/elastomer parts in contact with media

Alfa Laval Tank Agitator - ALTB dimensionDimensions

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.

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.

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.

Advantageous and profitable design

Each configuration offers a number of advantages, which are shown in the examples below:

Operation features Due to
Low energy consumption the wide range of high efficiency propellers and drive units makes it possible to design for low operational costs
Gentle product treatment the wide range of high efficiency propellers makes it possible to design for low shear operation

 

Hygienic features Due to
Easy external cleaning stainless steel bearing frame design with seal O-rings (for washing)
Connections inside the tank (risk zones) can be minimised bearing frame drives with drive shaft and special internal shaft connection without having a flange coupling inside the tank
Good drip off properties no plane surfaces or grooves on internal parts
Easy cleaning no interior shadow sides between the blades and smooth surfaces

 

Maintenance features Due to
Easy bottom bearing replacement wear bushings can be replaced without dismantling the agitator drive