Efficient Mixing and Agitation
Top mounted agitators, type ALT
Applications The Alfa Laval top mounted agitator offers mixing solutions to meet any requirements in food, dairy, beverage, pharmaceutical, biotechnology or cosmetic applications. Type ALT agitators can be dimensioned for several applications for both atmospheric and pressurized tanks and furthermore for use in sterile/aseptic applications. The correct sizing of the agitators ensures an optimised solution offering low energy consumption and configuration to meet specific design requirements. Examples are listed below:
Standard design
The Alfa Laval range of top mounted propeller agitators is designed to meet almost every customer requirement. Type ALT agitators are characterized by their free hanging shaft without bottom support.
Due to their modular build, the agitators can be designed for every kind of application in sanitary industries. 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 ALTB, top mounted agitators with bottom steady bearing
. Type ALS, side mounted agitators
. TypeALB, bottom mounted agitators
To read more about these agitator solutions please see separate Product Data Sheets.
Configurable design
 Type ALT agitators are a fully configurable design and the configuration can be divided into 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)
. Options
Each element has a broad range of different characteristics which make it possible to size the agitator for all applications and requirements.
Advantageous and profitable design
Each configuration offers a number of advantages, which are shown in the examples below:
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 3x380 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.
Materials
List the range of materials available for wetted parts
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 stationaryo-rings)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FPM
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Other materials on request.
Mechanical seal parts: . . . . . . . . . . . . . . . Carbon
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carbon (FDA)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Silicon carbide
Specific selection of materials will depend on the actual configuration selected.
Material Certificate - option
3.1 Material certificates/FDA conformity statement according to 21 CFR177 on steel/elastomer parts in contact with the media
ATEX - option
Agitators can be delivered approved for use in an ATEX environment with declaration of conformity according to directive 94/9/EC, approved according to ATEX categories:
In tank: . . . . . . . . . . . . . . . . . . . . . .II1GDcTX, II2GDcTX or II3GDcTX
Outside tank: . . . . . . . . . . . . . . . . . .II2GDcTX or II3GDcTX
NOTE: Not all configurations can be delivered according to ATEX directive 94/9/EC.
Dimensions
Standard propeller diameter range: 125 mm to 1900 mm.
Specific dimensions on the drive unit and propeller(s) will depend on the actual configuration selected.
Enquiries
The following information is required to ensure correct sizing and configuration for ordering:
For budget pricing use the following inquiry handling form from Alfa Laval (electronic version): "Simple enquiry, agitator".
For a detailed quotation use the following inquiry handling form from Alfa Laval (electronic version): "Advanced enquiry, agitator".
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