Drainage Pumps
Series: Discharge Bore: Motor Output / Pole:
LB 50(80)mm 0.48 - 1.5kW / 2-pole
The LB-series is a submersible single-phase portable drainage pump. Though
it is a single-phase unit, the pump has the durability equivalent to three-
phase drainage pumps, since the wear parts are made of abrasion-resistant
materials. The top discharge, flow-thru design provides maximum motor cooling
efficiency allowing continuous operation at low water levels and extended dry-
run capability. Every LB model is slim design enough to be accommodated in an
8-inch pipe. The discharge direction is selectable between vertical and inclined,
which prevents folding or bending of the discharge hose.*
* excluding LB-1500
Selection Table
Discharge Motor Starting Dry
Model Phase Pole
Bore Output Method Weight
mm kW kg
LB-480 50 0.48 1-phase Capacitor Run 2 10.4
LB-800 50(80) 0.75 1-phase Capacitor Run 2 13.1
LB-1500 50(80) 1.5 1-phase Capacitor Start 2 33
80mm discharge bore available on special request.
Performance Curves
22 22
20 20
16 16
L
B
Total Head (m)
Total Head (m)
-1
50
L
12 12
0
B
-1
LB
L
50
B
-8
0
-8
00
00
L
L
8 8
B
-4
-4
8
0
80
4 4
0 0
0 0.1 0.2 0.3 0.4 0.5 0 0.1 0.2 0.3 0.4 0.5
Capacity (m3/min) Capacity (m3/min)
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Drainage Pumps
LB-series
SPECIFICATIONS Model LB-1500
1.5kW, 1-phase
Type of Pump Impeller
Submersible drainage pump for construction and Semi-open impeller made of high-chromium cast iron
foundation works, floodwater drainage, etc.
Solids Passage
Type of Fluid 50Hz – 6mm
Stormwater, groundwater, wash water, and 60Hz – 6mm
sand-carrying water
Cable Entry with Anti-Wicking Block
Temperature: 0 to 40oC Watertight cable entry with strain-relief device. The anti-
wicking block prevents water incursion due to capillary
Discharge Bore & Connection action should the power cable be damaged or the end
50mm, Hose Coupling submerged.
(80mm discharge bore available on special request)
Bearing
Motor Output Permanently lubricated, deep-groove, double-shielded
1.5kW C3 ball bearings
Power Supply Shaft
Single-phase 403 stainless steel
Starting Method Shaft Seal (Mechanical Seal)
Capacitor Start Furnished with a double-face mechanical seal located in
oil chamber. Both upper and lower seal faces always run
Motor in a clean environment.
Continuous-duty rated, dry-type induction motor
Upper Seal Face: SiC + SiC
Insulation Class: B Lower Seal Face: SiC + SiC
Degree of Protection: IP68
OIL LIFTER (Patented)
No. of Poles & Speed (Synchronous Speed) Equipped in oil chamber. It forcibly supplies lubricating
2-pole, 3000/3600min-1 (50/60Hz) oil to the mechanical seal and continues to supply the oil
to the upper seal faces even if lubricant falls below the
Power Supply Voltages & Rated Currents rated volume.
50Hz 60Hz
220V – 14.1A 110V – 27.1A Type of Lubricating Oil & Volume
230V – 15.7A 220V – 13.7A Turbine Oil (ISO VG32), 350ml
240V – 16.3A
Motor Protection Device
Power Cable A circle thermal protector built in the motor housing.
Sheath: Chloroprene rubber Directly cuts the motor circuit if excessive heat builds up
Standard Length: 10m or an overcurrent condition occurs in the motor.
200 to 240V supply:
1 x 3 x 2.0mm2, O.D. 14.4mm
100 to 120V supply:
1 x 3 x 3.5mm2, O.D. 15.6mm
Dry Weight (excluding cable)
33kg
24
Drainage Pumps
LB-series
DIMENSIONS Model LB-480 to LB-1500
50mm
C. W. L. : Continuous Running Water Level
LB-480 LB-1500
LB-800 A
A2
A1
D
A1
A
D
Nominal
Dia. d
Nominal
Dia. d
H
B1
H
B
B1
C.W.L. C.W.L.
W1
W1
Unit: mm
Model d A A1 A2 B B1 D H W1
LB-480 50 233 162 189 — 228 187 286 50
LB-800 50(80) 230 160 186 338 283 187 341 50
LB-1500 50(80) 187 122 — 600 518 187 593 80
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