Efficient Mixing and Agitation
Top mounted agitators, type ALTB
Applications
 The Alfa Laval top mounted agitator with bottom steady bearing offers mixing solutions to meet many requirements in food, dairy, beverage, pharmaceutical, biotechnology or cosmetic applications
Type ALTB agitators can be dimensioned for several applications for both atmospheric and pressurised 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 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 sanitary 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
To read more about these agitator solutions please see separate Product Data Sheets.
Configurable design
Type ALTB 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)
. 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 below.
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 stationary o-rings)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FPM
Other materials on request.
Mechanical seal parts: . . . . . . . . . . . . . .Carbon
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carbon (FDA)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Silicon carbide
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wear bushings
(bottomsteady bearing): . . . . . . . . . . . . .PTFE (BS1P/BS1G) PVDF (BS2P)
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 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 detailed quotation use the the following inquiry handling form from
Alfa Laval (electronic version): "Advanced enquiry, agitator".
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