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Agitator LKR-5
with shroud. |
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Application
Agitator LKR-5 is used in tanks or vessels
where the product requires mixing or stirring.
LKR-5 is intended for horizontal
installation into the tanks or vessels. LKR-5 is used in
process and storage tanks in the food processing industry,
dairies, breweries and in the chemical industry.
Standard design
Agitator LKR-5 is fitted with a standard
motor and the agitator shaft is directly coupled to the
motor shaft. There is a bracket and a front plate between
the motor and the welding flange. The welding flange is
designed for welding into the tank.
The joint between the front plate and mating
flange is fitted with an O-ring which acts as a sanitary
seal. The shaft seal is fitted on the product side and is
replaceable as a complete unit. The propeller shaft is in
solid steel and is fitted onto the motor shaft by means of a
compression ring which is adjusted to the correct tension
during assembly before delivery. The propeller is a 3-bladed
type, statically and dynamically balanced.
The standard motor is suitable for operating
in humid conditions. The motor is protected by a stainless
steel shroud as standard.
Note! The agitator has to be
installed horizontally and perpendicular to the tank. For
further details, please see IM70790.
Materials
| Product wetted steel
parts: |
Stainless steel 1.4301 (304) or acid-resistant
steel 1.4404 (316L). |
| Other steel parts: |
Stainless steel 1.4301 (304). |
| Product wetted
seals: |
EPDM rubber. |
Shaft seal (spring loaded)
| Bellows: |
EPDM rubber. |
| Rotating seal ring: |
Carbon. |
| Stationary seal
ring: |
Silicon Carbide. |
| Finish, steel parts: |
Semi-bright. |
| Motor and bracket: |
Painted. |
Motor
Standard flanged motor acc. to IEC metric
standard IP55 (with drain holes with labyrinth plug),
insulation class F.
Voltage and frequency for standard motor
| 3 ~, 50 Hz, 220-240V
Δ/380-420VY |
≤ 2.2 kW |
| 3 ~, 60 Hz, 250-280V
Δ/440-480VY |
≤ 3 kW |
| 3 ~, 50 Hz, 380-420V
Δ/660-690VY |
≥ 3 kW |
| 3 ~, 60 Hz, 440-480V
Δ |
≥ 4 kW |
Motor sizes
| 50Hz: |
1.5, 2.2, 3.0, 4.0, 5.5, 7.5 kW. |
| 60Hz: |
1.75, 2.5, 3.5, 4.6, 6.3, 8.6 kW. |
Selection of LKR-5
Calculation for low viscous products (max.
100 cP - eg. milk, juice, wine etc.):
| Agitating time [min.]
= V/Q |
- - V = Liquid volume of tank (m3)
Q = Flow of LKR-5 (m3/min)
Normal agitating time
- - Agitating: 5-10 min.
Mixing: 1-2 min.
Installation advice
- - Min. distance between agitator and tank bottom:
2 x propeller diameter.
- - Max. height of silo tanks:
H < 3 x tank diameter.
If H > 3 x tank diameter, use 2 agitators, one of
which is to be placed half way up the tank - note that
both agitators are to be placed on the same side.
- - Protect the agitator against dry run.
- - Select rubber and shaft seal, depending on
product/CIP.
Basic agitator calculations
| Flow capacity: |
| Q = C1 x n x D2 x S |
Power required:
| P = C2 x r x n3 x D5 |
(turbulent flow) |
| Q = Agitator flow |
(m3/min) |
| P = Power |
(kW) |
| n = Revolution |
(rpm) |
| D = Propeller diameter |
(m) |
| S = Propeller pitch |
(m) |
| r = Density |
(Kg/m3) |
| C1/C2 =
Factor specific for the propeller |
Calculation of change in rpm and impeller
diameter
Change in rpm (n):
Change in impeller diameter (D):
Ordering
Please state the following when ordering:
- - Agitator type LKR-5.Propeller diameter.
- - Propeller diameter.
- - Motor power and speed
- - Options.
Options
- - Supplied without shroud.
- - Motors for other voltage or frequency.
- - Other shaft seal combinations and other product
wetted rubber types:
- - - Shaft seal carbon/silicon carbide/NBR
rubber.
- - - Shaft seal carbon/silicon carbide/FPM
rubber.
- - - Shaft seal silicon carbide/silicon
carbide/EPDM rubber.
- - - Shaft seal silicon carbide/silicon
carbide/NBR rubber.
- - - Shaft seal silicon carbide/silicon
carbide/FPM rubber.
Technical data
|
Propeller size diam. (mm) |
Rev. (rpm) |
Motor (kW) |
Max.
current
at 380 V
(A) |
Measured
current
at 380 V
(A) |
Max. static pressure |
Max temp.
seal:
EPDM
(°C) |
Max. temp.
seal: Nitril
(NBR)
(°C) |
Max. temp.
seal: Flouri- nated rubber
FPM (°C) |
Q (m3/min.) |
cm (m/sec.) |
Weight (kg) |
| 200 |
950 |
1.5 |
4.1 |
2.7 |
500 kPa
5 bar |
120 |
90 |
135 |
4.5 |
3.1 |
30 |
|
200 |
1430 |
2.2 |
4.96 |
4.8 |
6.8 |
4.7 |
28 |
| 200 |
1430 |
3.0 |
6.61 |
5.0 |
6.8 |
4.7 |
31 |
|
250 |
940 |
2.2 |
5.4 |
4.7 |
8.5 |
3.8 |
56 |
| 250 |
960 |
3.0 |
7.1 |
6.0 |
8.5 |
3.8 |
69 |
|
250 |
960 |
4.0 |
8.9 |
6.0 |
8.5 |
3.8 |
76 |
| 250 |
1450 |
5.5 |
11.5 |
10.0 |
13.5 |
5.9 |
70 |
|
250 |
1450 |
7.5 |
15.3 |
10.0 |
13.5 |
5.9 |
78 |
| 300 |
720 |
3.0 |
7.8 |
7.0 |
11.5 |
3.5 |
80 |
|
300 |
960 |
5.5 |
12.2 |
11.0 |
15.0 |
4.2 |
80 |
The data
is valid for agitation in water (20°C) and for 50 Hz
only.
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Note!
At 60 Hz the rpm will be increased with 20% and
need
more power (kW). Contact Alfa Laval for advice.
Note! It is recommended to turn the terminal
box downwards.
Please weld-in the flange accordingly.
Note! For further details, see also PD 65036. |
|
Q |
- - Theoretical mixing capacity.
|
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Cm |
- - Theoretical jet velocity on the delivery
side of the
propeller.
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Dimensions (mm)
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Fig. 2. Dimensions.
1) Terminal box
Dimensions (mm)
|
Prop.size(D) |
200 |
250 |
250 (940rpm/2.2kW |
300 |
| A* |
622 |
837 |
714 |
837 |
|
B |
200 |
300 |
250 |
300 |
| C |
260 |
330 |
330 |
330 |
|
E* |
410 |
525 |
452 |
525 |
| F* |
234 |
304 |
304 |
304 |
|
G |
30 |
35 |
30 |
35 |
| H |
200 |
270 |
270 |
270 |
|
Thread |
M 10 |
M 12 |
M 12 |
M 12 |
| Weight |
30 |
70 |
56 |
80 |
* Agitator fitted with shroud.
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