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Alfa Laval LKH Centrifugal Pump

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The Premium Pump

LKH Centrifugal Pump

Applications
LKH PumpThe LKH pump is a highly efficient and economical centrifugal pump, which meets the requirements of sanitary and gentle product treatment and chemical resistance. LKH is available in thirteen sizes, LKH-5, -10, -15, -20, -25, -35, -40, -45, -50, -60, -70, -80 and -90.
 
Standard design
The LKH pump consists of a standard motor, stub shaft, mechanical compression coupling (LKH-5 with pin bolts), adaptor, back plate, impeller, pump casing and shaft seal. (LKH-5 has clamp connection between pump casing and back plate). The LKH pump is designed for CIP with emphasis on large internal roundings and cleanable seals. The sanitary version of LKH has a stainless steel shroud for protection of the motor, and the complete unit is supported on four adjustable stainless steel legs.
 
Shaft seals
The LKH pump is equipped with either an external single or a flushed shaft seal. Both have stationary seal rings in acid resistant steel AISI 329 with sealing surface in silicon carbide and rotating seal rings in carbon. The secondary seal of the flushed seal is a long lasting lip seal. The pump may also be equipped with a double mechanical shaft seal.
 
Materials
Product wetted steel parts: Acid-resistant steel 1.4404 (316L).
Other steel parts: Stainless steel 1.4301 (304).
Finish: Semi bright.
Product wetted seals: EPDM rubber.
 
Technical data
Max. inlet pressure: LKH-5: 600 kPa (6 bar)LKH-10 - 80 (50 Hz): 1000 kPa (10 bar).LKH-70 - 90 (60 Hz): 500 kPa (5 bar).LKH-90 (50 Hz): 500 kPa (5 bar).
Temperature range: -10C to +140C (EPDM).
Noise level (at 1 m): 60 - 85 dB (A).
 
Flushed shaft seal (LKH-5 to LKH-90):
Water pressure inlet: Max. 1 bar.
Water consumption: 0.25 -0.5 l/min.
 
Double mechanical shaft seal:
Water pressure inlet, LKH-5 to -60: Max. 500 kPa (5 bar).
Water pressure inlet, LKH-70 and -90: Max. 300 kPa (3 bar).
Water consumption: 0.25 -0.5 l/min.
 
Connections for FSS and DMSS:
R 1/8" (BSP) external thread.
(LKH 85: 6mm tube/Rp 1/8").
 
Motor
Foot-flanged motor according to the IEC metric standard, 2 poles = 3000/3600 rpm at 50/60 Hz, IP 55 (with drain hole with labyrinth plug), insulation class F.
 
LKH-90 4 poles = 1500/1800 rpm at 50/60 Hz.
 
Voltage and frequency
3 ~, 50 Hz, 220-240V Δ/380-420VY ≤ 4 kW
3 ~, 60 Hz, 250-280V Δ/440-480VY ≤ 4.6 kW 
3 ~, 50 Hz, 380-420V Δ/660-690VY ≥ 5.5 kW
3 ~, 60 Hz, 440-480V Δ ≥ 6.4 kW
 
Motor sizes
50 Hz: 0.75 - 1.1 - 1.5 - 2.2 - 3 - 4 - 5.5 - 7.5 - 11 - 15 -18.5 - 22 - 30 - 37 - 45 - 55 - 75 kW.
60 Hz: 0.9 - 1.3 - 1.75 - 2.5 - 3.5 - 4.6 - 6.4 - 8.6 - 12.5 -17 - 21 - 25 - 35 - 43 - 52 - 63 - 86 kW.
 
Warranty
Extended 3-years warranty on LKH pumps. The warranty covers all non wear parts on the condition that genuine Alfa Laval Spare Parts are used.
 
Dimensions (mm)
LKH1
LKH2
LKH3
LKH4
Options
A. Impeller with reduced diameter.
B. Impeller screw/nut (standard for LKH-70 - LKH-90).
C. Motor for other voltage and/or frequency.
D. 1500 rpm. motor.
E. Motor with increased safety/flame proof motor.
F. Inducer (only LKH-10 to -50).
G. Flushed shaft seal.
H. Double mechanical shaft seal.
I. Counter flanges, seal rings and bolts for flanged connections (industrial version).
J. Wider clearance between impeller and backplate if there is a risk of building up a hard layer of product. Standard clearance is 0.5 mm (1 mm for LKH-70/80) and can be made up to 2.5 mm).
K. Surface roughness, product wetted parts: Ra ≤ 0.8 μm and Ra ≤ 0.8 μm.
L. Product wetted seals of Nitrile (NBR), Fluorinated rubber (FPM) or FEP.
M. Rotating seal ring of Silicon Carbide.
 
Ordering
Please state the following when ordering:
- Pump size.
- Version, sanitary or industrial.
- Connections.
- Impeller diameter.
- Motor size.
- Voltage and frequency.
- Flow, pressure and temperature.
- Density and viscosity of the product.
- Options.

Note!
For further details, see also PD 65036 and IM 70737.
This product has EHEDG certification
 
Flow chart
Frequency: 50 Hz Speed (synchr): 3000 rpm
LKH5
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