T T op mounted agitators with B ottom SupportType AL TB B ottom mounted agitatorsType AL B S ide mounted agitatorsType AL ID: 918745
Download Presentation The PPT/PDF document "T op mounted agitators ……………..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Slide2T
op mounted agitators ………………………….Type : AL
T
T
op mounted agitators with
B
ottom Support…Type : AL
TB Bottom mounted agitators………………………Type : ALBS
ide mounted agitators………………………….Type : AL
S
ALT ALTB ALB ALS
Range
Slide3Duties
Slide4Duties
Maintain homogeneous
media
Mixing
Solutions (dissolve)
Solids Dispersion Suspension Heat Transmission Dairy Fermentation
Often an application is a mix of the mentioned duties
Slide5Mixing
Agitation Intensity
High to Very High
Typical Application
Fluid + fluid mixing, i.e.: Drinking yoghurt and fruit mix tanks
flavored milk mix tanks, syrup mix tanks, etc.
Slide6Maintain homogeneous
media
Agitation Intensity: Low
Typical Application:
Milk storage tanks, cream tanks,
mixed products tanks, UHT products, storage tanks etc
Agitator: Standard ALS (< 50 cP), ALS, ALT(B) or ALBDuties
Mixing
Agitation Intensity: High to Very High
Typical Application:
Fluid + fluid mixing, i.e.: Drinking
yoghurt and fruit mix tanks flavored milk mix tanks, syrup
mix tanks etc.
Agitator: ALT(B), ALB or ALS
Often an application is a mix of the more than just one duties
Slide7Dissolving
Agitation Intensity: High to Very High
Typical Application:
Lye preparation tanks,
salt solution tanks etc.
Agitator: ALT(B) or ALB
Solids Suspension
Agitation Intensity: High to very High
(According to solid deposit velocity and tank
height/diameter ratio.)
Typical Application:
Powder protein + oil mix tanks,
micro salt + milk product mix tanks etc.
Agitator: ALT(B) or ALB
Duties
Slide8Heat transmission
Agitation Intensity: Medium to High
Typical Application:
Circulation of media in tanks
with dimple jacket (cooling or heating)
Agitator: ALT(B)
Fermentation
Agitation Intensity: High to Very High
Typical Application:
Yoghurt
tanks,
cheese
culture
tanks,
creme
fraiche etc.
Agitator: ALT(B) -
EnSaFerm
Duties
Slide9Top mounted
No mechanical shaft seal
Stirring to last drop possible
Several impellers possible
“Difficult maintenance
Strong tank top required
Railing may be needed
Bottom and side mounted
Seal must be wetted by product when running
No railing
Ground access for installation
Easy maintenance
Less rigid tank construction
Example
:
Atmospheric
tank,
low
viscosity
media
Duties
Slide10Agitator Build
The agitator consist of the following elements
Drive unit with bearing frame (shaft support)
Lantern (spacer)
Shaft seal arrangement
Shaft
Propellers
Welding flange (not shown)
Slide11EnSaFoil Propellers
Surface Finish
Polished (standard Ra<0,8
µm)
Electro polished
(standard Ra<0,8µm)
Shot peened
Diameter
125mm to 1900mm
Mounting on Shaft
Threaded shaft and propeller hub with open seal
O-ring (standard for type ALT with one propeller, ALS, ALB)
Bored propeller hub with set screws countersunk
into shaft (standard for type ALT with more than one propeller and ALTB)
Propeller prepared for welding onto the shaft
<< BACK
Slide12Low
level
agitation
Stirring during emptying
Expensive
products
Low level impeller (LLI)
Slide13Bottom steady bearing with PTFE bushing, bushing with helical grooves for effective cleaning and lubrication
Surface Finish
Polished (standard Ra<0,8
µm)
Shot peened
Sanitary bottom steady bearing with PVDF bushings. The most
sanitary bottom steady bearing.Surface Finish Polished (Standard Ra<0,8µm)
<< BACK
Type : BS1
Type : BS2
Bottom Support
Slide14EnSaFerm
Slide15Modular
design
The Alfa Laval range of propeller agitators
is designed to meet almost every customer requirement and applications.
to be tailored to product composition and the geometry of the tank.
The modular construction is designed with the aim to meet both European
and American standards and regulations for the sanitary industry, such as
EHEDG, USDA, FDA, 3A etc.
Slide16Modular Design
All agitators are built using the same basic modules in various sizes
All elements in the modular construction are designed with the aim to meet both European and American standards and regulations, such as EHEDG, USDA, FDA, 3A etc.
High level of flexibility i.e.
easy change of design on existing agitators e.g. shaft seal
Slide17Motor
Motor size and speed as required for duty.
As standard with IEC motor IP55, other types on request.
Voltage and frequency
As standard for 3x230/690 V +/- 10 %, 50 Hz
3x400/690 V +/- 10 %, 50Hz 3x265/460 V
+/- 10 %, 60Hz 3x332/575 V +/- 10 %, 60Hz Other voltages and frequencies on request.Modular design
Slide18Direct drive unit
Typical Applications
All tanks sizes (ALT only for typically smaller tanks) Short term running – a few hours per day.
Agitator Types
ALT or ALS Features
Maintenance free Simple design
Low cost
Modular design
Slide19Geared drive unit
Typical Applications
All tank sizes
All applications
Agitator Types
ALTB, ALT
Features
Maintenance free (though oil change on larger gear boxes)
Modular
design
Slide20Materials for wetted parts
Steel parts:
AISI 316L (standard)
AISI 304
Other materials on request.
Surface treatment
Shot peened Ra <3,2µm
Polished Ra <0,8µmElectro polished Ra <0,51µm
Modular
design
Slide21Seal rubber parts (
o-rings
):
EPDM
FPM (Fluorocarbon rubber (Viton))
FEP (
Fluorinated ethylene propylene (Teflon covered EPDM))Other materials on request. Mechanical seal parts:
Carbon
Silicon
carbide
Specific selection of materials will depend on the actual configuration
selected.
Modular
design
Slide22Material certificate
3.1 Material certificates
FDA conformity statement according to 21 CFR177 on steel/elastomer parts in contact with media
ATEX
approval
as option
Traceability (one step back and one step forward)
Factory acceptance Testand conformity with the following directives:Machinery Directive 2006/42Low Voltage Directive 2006/95EMC (electromagnetic compability
)
Directive 2004/108
Modular
design
Slide23Alfa Laval agitators are equipped with Energy Saving Foil (
EnSaFoil
or EnSaFerm
) with low energy consumption.
With a diameter of 125 mm to 1900 mm depending on the configuration, these impeller achieve
gentle agitation
a high flow rate
with minimal energy input from the drive unit.
Modular design
Slide24Compared
EnSaFoil
with pitch blade impeller, their efficiency is 400% better – which means lower operating costs.
less shear stress and shear rate in the product
less
friction
= less heat less power input energy to the systemless temperature increase
Low energy consumption
Slide25To achieve this, Alfa Laval experts use many different computerized analysis methods and design systems.
These include FEM (Finite Element Method) calculation software and advanced 3D CAD systems.
Unique design of
impeller
Shear rate
Power consumption
Viscosity
rangeClean-abilityStrength
Low energy consumption
Slide26Low energy consumption
The shear stress is defined as the shear force per unit area of the interface, and given by the equation
Equal flow pattern has therefor less shear stress and shear rate
For
EnSaFoil
: F ~ 0
Less Shear stress
Slide27Low energy consumption
The shear rate is defined as the velocity gradient, by the equation:
Equal flow pattern has therefor less shear stress and shear rate
For
EnSaFoil
:
Δ
x
~ 0
Less shear rate
Slide28Low energy consumption
Zoning
occurs
with radial flow
impellers
.
Zoning
is
much
less
severe
with
axial
flow
impellers
(
EnSaFoil
).
Thus, in tall tanks with more than one impeller, the mixing time will be lower if axial flow impellers like the
EnSaFoil
impellers are used
EnSaFoil
is more able to exchange liquid in zoning
= less energy consumption
Slide296000 m
3
Sun flower Oil tank
Tank Diameter : 22 m
Height : 18 m
Keep media homogeneous
3 Agitators type ALS at 1,5 kW
Low energy consumption
Slide30Outside the tank
All joints installed with outer seal-
o-rings
Bearing frame and lantern in stainless
steel with smooth surfaces
Easy
to
clean
Approx
1 m
Easy cleaning
Slide31Inside the tank
No surfaces where the media can accumulate
No interior shadow sides between the blades and smooth surfaces.
No interior shadow sides
Internal connections with outer seal
o-ring
Detachable shaft with or without a flange coupling inside the tank
Smooth surfaces
Easy to clean
Approx
0,7-0,5 m
Easy cleaning
Slide32The
propel
is designed
according to hygienically
standards and guidelines
Threaded with a
controlled
compression FEP O-ring, welded on the shaftor mounted with 4 pointed
screws
Easy cleaning
Slide33By
using
Alfa Laval Tank
Cleaning
Equipment
formation of ”
Splashback effect ” that clean
shadow
areas
Always
run the agitator
during
CIP
Allow
the CIP
liquid
to
wet
the
seal
for ALS and ALB
CIP
immediately
after emptying the tank
!
Easy cleaning
Slide34Sealing
Slide35Motor shaft
Cloe
Coupling
Ball bearing
Shaft drive
Screw
Ball
bearingRadial sealAgitator shaft
Bearing frame
Slide36Bearing frame - optional
Oil trap (only geared versions)
Radial
seal
Seal flange with
o-ring
, seal against tank flange
Typical Applications: Atmospheric tanks
Agitator Types:
ALT, ALTB
Features:
Low cost and simple
Sealing
– R - seal
Slide37Typical Applications: Atmospheric tanks, and Semi sanitary applications
Agitator Types:
ALS and ALB (ALT and ALTB up to 6 bar)
Features:
Low cost, Seal face materials:
SiC
/
SiC
or C/
SiC
Bearing frame - optional
Oil trap (only geared versions)
Single mechanical
seal
– type S1
Seal flange with
o-ring
, seal against tank flange
Sealing
- S1-seal
Slide38Typical Applications: Atmospheric tanks, Sanitary applications
Agitator Types:
ALS and ALB
(
ALT and ALTB up to 6 bar)
Features
No springs inside the media,
Seal face materials:
SiC
/
SiC or C/SiC
Bearing frame - optional
Oil trap (only geared versions)
Single
mechanical
seal
– type S2
Seal flange with
o-ring
, seal against tank flange
Sealing
- S2-seal
Slide39Oil trap (only geared version)
Lantern (Spacer)
Double mechanical shaft seal with flush chamber
Mounting flange with
o-ring
, seal against welding flange.
Typical Applications: High Pressure tanks (up to 10
barg
), Sanitary and aseptic applications (sterile barrier)
Agitator Types:
ALTB, ALT, ALS and ALB
Features:
Pressure up to 10 bar
Seal face materials:
SiC
/
SiC
or
SiC
/C
Sealing
- D-seal
Slide40Typical Applications:
High/low pressure tanks (up to 5 bar),
Sanitary applications (also pharmaceutical)
Agitator Types:
ALTB and ALT
Features:
Dry running (no flush),
Seal face materials: SiC/C (dry running Carbon)
Oil trap (only geared version)
Lantern (Spacer)
S seal for dry running
Mounting flange with
o-ring
, seal against welding flange.
Sealing
- S-seal
Slide41Bottom support (BS 1) with PTFE bushing with helical grooves for effective cleaning and lubrication
Surface Finish
Polished (standard Ra<0,8
µm)
Shot peened
Sanitary bottom support (BS 2) with PVDF bushings.
Surface Finish
Polished (Standard Ra<0,8µm)
Alfa Laval agitator
– bottom support
Slide42Low
level
agitation
Stirring during emptying
Expensive
products
Low level impeller (LLI)
Slide43Cover
Slide44Simple maintenance
All service on Alfa Laval agitators can be performed from the tank exterior.
Low maintenance costs due to
a very long seal service life
greater productivity because of reduced downtime.
This includes the replacement of wear parts,
such as shaft seals and bearings,
And thanks to a removable shaft that can be detached without entering the tank.
Slide45Top mounted
Off set
recommended
=
Ø
tank
* 1/6 to 1/4 Clearancemin = Øimpeller * 1/2 smax is from top of welding flange Y-dim
= s +
clearance
min
wmin = s * 1/15
Installation
Slide46Side mounted in angle 20° according to horizontal and E=5-7° or
E=C x tan (5-7°) off centre
Distance from propeller tip to tank bottom minimum 100 mm.
Minimum agitation
level
above
the propeller = Dpropeller x 0,5
Installation
Slide47Installation
Slide48Bottom mounted
Distance from propeller tip to tank bottom minimum 100 mm.
Minimum agitation
level
above
the propeller =
Øpropeller x 0,5
Installation
Slide49Installation
Slide50Slide51End