LG Series Vertical Multistage Pump – High-Rise Water Supply Type

LG Series Vertical Multistage Pump – High-Rise Water Supply Type

Subtitle: Vertical Multistage Easy-Service Booster Pump | Constant-Pressure Duty for High-Rise & Fire Sprinkler Systems

  • Constant-pressure boosting: High-rise supply, fire/sprinkler, and circulation make-up.
  • Direct-coupled inline design: Coaxial drive for smooth running and low vibration.
  • Easy service access: Quick-disassembly design; fast seal service.
  • Flexible piping integration: Inline ports; adjustable orientation; series/parallel expansion.
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Product Overview

The LG vertical, easy-dismantling multistage clean-water pump is an integrated vertical multistage pump unit developed for constant-pressure water supply in high-rise buildings and for fire-fighting duties. Based on a proven hydraulic design, it delivers high efficiency and stable head–capacity characteristics, making it suitable for continuous operation with low noise and long service life. The vertical multistage configuration provides a compact footprint and enables straightforward integration into building booster systems and packaged pump sets. With a lightweight, service-friendly component layout, the unit is well suited for engineering installations in building water supply, drainage, and building services systems.

Model Designation

LG Series Vertical Multistage Pump – High-Rise Water Supply Type

Key Features

  • Compact vertical multistage structure with a small footprint, suitable for building water systems; optional outdoor protection cover supports flexible installation scenarios.
  • Impellers directly mounted on motor shaft ensure coaxial operation, enhancing stability and extending equipment service life.
  • High-quality mechanical seal or cartridge seal, equipped with hard alloy sealing rings for improved wear resistance and extended seal durability.
  • Equal-diameter suction/discharge ports, support for series or parallel pump operation, configurable inlet/outlet orientation (0°, 90°, 180°, 270°), and head adjustability via stage modification or impeller trimming.

Engineering Summary

  • An integrated vertical multistage configuration with a compact overall arrangement, reducing footprint and facilitating booster-system integration.

  • Proven hydraulics delivering stable head–flow performance, supporting continuous-duty service.

  • A close-coupled direct-drive arrangement with controlled concentricity to reduce vibration and operating noise.

  • An easy-dismantling design enabling efficient inspection and fast mechanical seal replacement.

Typical Applications

  • Domestic water supply and constant-pressure boosting for high-rise and super high-rise buildings.

  • Pressure maintenance and primary supply units for fire hydrant and automatic sprinkler systems.

  • Centralized water supply systems for public buildings such as hotels, hospitals, and office buildings.

  • Cooling-tower make-up water, circulating water systems, and system pressure stabilization duties.

  • Boiler feedwater service and long-distance clean-water transfer.

System & Operation

Components & Supply

  • The pump and motor adopt a close-coupled direct-drive arrangement, forming a rigid integrated unit; no on-site alignment is required during installation or operation.

  • The drive is a Y-series three-phase induction motor with standardized design and interchangeability, supporting replacement and routine servicing.

  • The pump shaft and motor shaft are connected via a clamp-type coupling to ensure accurate alignment for smooth operation and reduced operating noise.

  • The shaft sealing system is a mechanical seal; the easy-dismantling structure supports efficient mechanical seal replacement during maintenance.

  • Viewed from the motor end, the rotation direction is clockwise.

Technical Specifications

Operating Conditions

  • Pumped liquid: Clean water or non-corrosive liquids with physical and chemical properties similar to water; kinematic viscosity ≤ 150 mm²/s; free of hard particles.

  • Installation altitude: ≤ 1000 m; if exceeded, specify at the time of order for appropriate configuration.

  • Medium temperature range: −15°C to 120°C.

  • Maximum system working pressure: ≤ 2.5 MPa.

  • Ambient limits: Ambient temperature < 40°C; relative humidity < 95%.

Service Conditions

  • Standard version is intended for clean-water transfer at normal temperature (typically < 80°C).

  • The hot-water version is suitable for medium temperatures up to 105°C.

  • With appropriate material selection and within the specified operating conditions, the pump can handle non-corrosive liquids with properties similar to water at normal temperature, supporting continuous duty and stable system performance.

  • The compact vertical multistage arrangement is suitable for integration into building booster systems and packaged pump sets, with service access designed for routine inspection and seal replacement.

Protection Functions

  • Motor overload protection: Provide overload protection to prevent overheating under abnormal load conditions.

  • Dry-run protection: Implement interlocks (level/flow-based) to prevent operation without adequate liquid supply.

  • Overpressure protection: Use pressure control and safety devices to ensure system pressure remains within the specified limit (≤ 2.5 MPa).

  • Backflow protection: Install a check valve on the discharge line to prevent reverse flow and associated hydraulic shock.

Selection Criteria

  • Select pump model and number of stages based on the required flow rate and total head, keeping the duty point within the preferred efficiency range.

  • Confirm the pumped medium meets limits for viscosity, solids, and corrosiveness, and select the standard or hot-water version according to medium temperature.

  • Verify site conditions against altitude, ambient temperature, and humidity limits; specify special conditions at ordering to ensure correct configuration.

  • Ensure the maximum system working pressure does not exceed 2.5 MPa, and confirm nozzle orientation requirements (0°/90°/180°/270°) for the piping layout.

  • For continuous-duty systems, consider series/parallel arrangements and maintenance access requirements enabled by the easy-dismantling structure.

Installation Dimensions/Size

Outline Drawing

LG Series Vertical Multistage Pump – High-Rise Water Supply Type

Pump Parts & Materials List

Item No. Component Name Material / Model Item No. Component Name Material / Model
1 Motor Y Series (V5), 2-Pole 9 Shaft Sleeve Q235
2 Motor Bracket HT200 10 Middle Section HT200
3 Coupling HT200 11 Diffuser HT200
4 Mechanical Seal Cover HT200 12 Impeller HT200
5 Air Release Valve Copper Alloy 13 Shaft 45 Steel / 2Cr13
6 Mechanical Seal 120A 14 Bearing Tin Bronze
7 Final Diffuser HT200 15 Suction Section HT200
8 Discharge Section HT200

Performance Parameters

Model Stages Flow Head Speed Motor Power Efficiency Weight Required
(m3/h) (M) (r/min) (kw) (%) Kg NPSH(m)
25LG(R)3-10*2 2 3 20 2900 0.75 42 70 2.0
25LG(R)3-10*3 3 3 30 2900 1.1 42 74 2.0
25LG(R)3-10*4 4 3 40 2900 1.5 42 85 2.0
25LG(R)3-10*5 5 3 50 2900 1.5 42 89 2.0
25LG(R)3-10*6 6 3 60 2900 2.2 42 100 2.0
25LG(R)3-10*7 7 3 70 2900 2.2 42 104 2.0
25LG(R)3-10*8 8 3 80 2900 2.2 42 108 2.0
25LG(R)3-10*9 9 3 90 2900 2.2 42 112 2.0
25LG(R)3-10*10 10 3 100 2900 3 42 125 2.0
25LG(R)3-10*11 11 3 110 2900 3 42 129 2.0
25LG(R)3-10*12 12 3 120 2900 4 42 145 2.0
25LG(R)3-10*13 13 3 130 2900 4 42 149 2.0
25LG(R)3-10*14 14 3 140 2900 4 42 153 2.0
25LG(R)3-10*15 15 3 150 2900 4 42 157 2.0
Model Stages Flow Head Speed Motor Power Efficiency Weight Required
(m3/h) (M) (r/min) (kw) (%) Kg NPSH(m)
32LG(R)6.5-15*2 2 6.5 30 2900 1.5 53 90 2.4
32LG(R)6.5-15*3 3 6.5 45 2900 2.2 53 100 2.4
32LG(R)6.5-15*4 4 6.5 60 2900 3 53 115 2.4
32LG(R)6.5-15*5 5 6.5 75 2900 4 53 135 2.4
32LG(R)6.5-15*6 6 6.5 90 2900 4 53 142 2.4
32LG(R)6.5-15*7 7 6.5 105 2900 5.5 53 175 2.4
32LG(R)6.5-15*8 8 6.5 120 2900 5.5 53 182 2.4
32LG(R)6.5-15*9 9 6.5 135 2900 5.5 53 190 2.4
32LG(R)6.5-15*10 10 6.5 150 2900 7.5 53 210 2.4
40LG(R)12-15*2 2 12 30 2900 2.2 60 90 2.9
40LG(R)12-15*3 3 12 45 2900 3 60 105 2.9
40LG(R)12-15*4 4 12 60 2900 4 60 130 2.9
40LG(R)12-15*5 5 12 75 2900 5.5 60 155 2.9
40LG(R)12-15*6 6 12 90 2900 5.5 60 163 2.9
40LG(R)12-15*7 7 12 105 2900 7.5 60 180 2.9
40LG(R)12-15*8 8 12 120 2900 7.5 60 190 2.9
40LG(R)12-15*9 9 12 135 2900 11 60 215 2.9
40LG(R)12-15*10 10 12 150 2900 11 60 225 2.9
Model Stages Flow Head Speed Motor Power Efficiency Weight Required
(m3/h) (M) (r/min) (kw) (%) Kg NPSH(m)
50LG(R)24-20*2 2 24 40 2900 5.5 69 160 3.2
50LG(R)24-20*3 3 24 60 2900 7.5 69 180 3.2
50LG(R)24-20*4 4 24 80 2900 11 69 250 3.2
50LG(R)24-20*5 5 24 100 2900 11 69 260 3.2
50LG(R)24-20*6 6 24 120 2900 15 69 280 3.2
50LG(R)24-20*7 7 24 140 2900 15 69 290 3.2
50LG(R)24-20*8 8 24 160 2900 18.5 69 315 3.2
65LG(R)36-20*2 2 36 40 2900 7.5 72 170 3.4
65LG(R)36-20*3 3 36 60 2900 11 72 230 3.4
65LG(R)36-20*4 4 36 80 2900 15 72 250 3.4
65LG(R)36-20*5 5 36 100 2900 18.5 72 280 3.4
65LG(R)36-20*6 6 36 120 2900 22 72 330 3.4
65LG(R)36-20*7 7 36 140 2900 22 72 345 3.4
65LG(R)36-20*8 8 36 160 2900 30 72 395 3.4
Model Stages Flow Head Speed Motor Power Efficiency Weight Required
(m3/h) (M) (r/min) (kw) (%) Kg NPSH(m)
80LG(R)50-20*2 2 50 40 2900 11 73 250 3.4
80LG(R)50-20*3 3 50 60 2900 15 73 280 3.4
80LG(R)50-20*4 4 50 80 2900 18.5 73 310 3.4
80LG(R)50-20*5 5 50 100 2900 22 73 360 3.4
80LG(R)50-20*6 6 50 120 2900 30 73 440 3.4
80LG(R)50-20*7 7 50 140 2900 30 73 460
80LG(R)50-20*8 8 50 160 2900 37 73 490
100LG72-20*2 2 72 40 2900 11 73 260 3.5
100LG72-20*3 3 72 60 2900 18.5 73 290 3.5
100LG72-20*4 4 72 80 2900 22.0 73 380 3.5
100LG72-20*5 5 72 100 2900 30.0 73 450 3.5
100LG72-20*6 6 72 120 2900 37.0 73 470 3.5
100LG72-20*7 7 72 140 2900 45.0 73 520 3.5
100LG72-20*8 8 72 160 2900 45.0 73 540 3.5
100LG72-20*9 9 72 180 2900 55.0 73 3.5
Model Stages Flow Head Speed Motor Power Efficiency Weight Required
(m3/h) (M) (r/min) (kw) (%) Kg NPSH(m)
100LG100-20*2 2 100 40 2900 18.5 76 3.7
100LG100-20*3 3 100 60 2900 30 76 3.7
100LG100-20*4 4 100 80 2900 37 76 3.7
100LG100-20*5 5 100 100 2900 45 76 3.7
100LG100-20*6 6 100 120 2900 55 76 3.7
100LG100-20*7 7 100 140 2900 75 76 3.7
100LG100-20*8 8 100 160 2900 75 76 3.7
150LG150-20*2 2 150 40 2900 30 77 4.1
150LG150-20*3 3 150 60 2900 37 77 4.1
150LG150-20*4 4 150 80 2900 45 77 4.1
150LG150-20*5 5 150 100 2900 55 77 4.1
150LG150-20*6 6 150 120 2900 75 77 4.1
150LG150-20*7 7 150 140 2900 90 77 4.1
150LG150-20*8 8 150 160 2900 90 77 4.1
150LG150-20*9 9 150 180 2900 110 77 4.1
150LG150-20*10 10 150 200 2900 132 77 4.1

Installation Diagram

LG Series Vertical Multistage Pump – High-Rise Water Supply Type

 

Installation Dimensions（1）

Model

 Stages L H H1 H2 B b n-φd Inlet Flange Outlet Flange
Dj Djn Dj2 n-dj Dc Dcn Dc2 n-φdc
25LG(R)3-10 2 130 630 85 180 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 3 130 670 85 220 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 4 130 710 85 260 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 5 130 755 85 305 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 6 130 825 85 340 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 7 130 865 85 380 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 8 130 900 85 425 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 9 130 945 85 460 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 10 130 1020 85 500 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 11 130 1060 85 540 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 12 130 1120 85 580 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 13 130 1160 85 620 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 14 130 1200 85 660 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14
25LG(R)3-10 15 130 1240 85 700 230 190 4-φ18 115 25 85 4-M12 115 25 85 4-φ14

Model

 Stages L H H1 H2 B b n-φd Inlet Flange Outlet Flange
Dj Djn Dj2 n-dj Dc Dcn Dc2 n-φdc
32LG(R)6.5-15 2 145 665 63 179 260 220 4-φ18 140 32 100 4-M16 140 32 100 4-φ18
32LG(R)6.5-15 3 145 740 63 229 260 220 4-φ18 140 32 100 4-M16 140 32 100 4-φ18
32LG(R)6.5-15 4 145 825 63 279 260 220 4-φ18 140 32 100 4-M16 140 32 100 4-φ18
32LG(R)6.5-15 5 145 895 63 329 260 220 4-φ18 140 32 100 4-M16 140 32 100 4-φ18
32LG(R)6.5-15 6 145 945 63 379 260 220 4-φ18 140 32 100 4-M16 140 32 100 4-φ18
32LG(R)6.5-15 7 145 1070 63 429 260 220 4-φ18 140 32 100 4-M16 140 32 100 4-φ18
32LG(R)6.5-15 8 145 1120 63 479 260 220 4-φ18 140 32 100 4-M16 140 32 100 4-φ18
32LG(R)6.5-15 9 145 1170 63 529 260 220 4-φ18 140 32 100 4-M16 140 32 100 4-φ18
32LG(R)6.5-15 10 145 1220 63 579 260 220 4-φ18 140 32 100 4-M16 140 32 100 4-φ18
40LG(R)12-15 2 145 710 70 193 260 220 4-φ18 150 40 110 4-M16 150 40 110 4-φ18
40LG(R)12-15 3 145 800 70 251 260 220 4-φ18 150 40 110 4-M16 150 40 110 4-φ18
40LG(R)12-15 4 145 880 70 309 260 220 4-φ18 150 40 110 4-M16 150 40 110 4-φ18
40LG(R)12-15 5 145 1015 70 367 260 220 4-φ18 150 40 110 4-M16 150 40 110 4-φ18
40LG(R)12-15 6 145 1075 70 425 260 220 4-φ18 150 40 110 4-M16 150 40 110 4-φ18
40LG(R)12-15 7 145 1170 70 483 260 220 4-φ18 150 40 110 4-M16 150 40 110 4-φ18
40LG(R)12-15 8 145 1230 70 541 260 220 4-φ18 150 40 110 4-M16 150 40 110 4-φ18
40LG(R)12-15 9 145 1410 70 599 260 220 4-φ18 150 40 110 4-M16 150 40 110 4-φ18
40LG(R)12-15 10 145 1465 70 657 260 220 4-φ18 150 40 110 4-M16 150 40 110 4-φ18

Model

 Stages L H H1 H2 B b n-φd Inlet Flange Outlet Flange
Dj Djn Dj2 n-dj Dc Dcn Dc2 n-φdc
50LG(R)24-20 2 180 885 80 214 300 248 4-φ23 165 50 125 4-M16 165 50 125 4-φ18
50LG(R)24-20 3 180 985 80 273 300 248 4-φ23 165 50 125 4-M16 165 50 125 4-φ18
50LG(R)24-20 4 180 1145 80 332 300 248 4-φ23 165 50 125 4-M16 165 50 125 4-φ18
50LG(R)24-20 5 180 1210 80 391 300 248 4-φ23 165 50 125 4-M16 165 50 125 4-φ18
50LG(R)24-20 6 180 1275 80 450 300 248 4-φ23 165 50 125 4-M16 165 50 125 4-φ18
50LG(R)24-20 7 180 1340 80 509 300 248 4-φ23 165 50 125 4-M16 165 50 125 4-φ18
50LG(R)24-20 8 180 1450 80 568 300 248 4-φ23 165 50 125 4-M16 165 50 125 4-φ18
65LG(R)36-20 2 180 965 90 245 300 248 4-φ23 185 65 145 4-M16 185 65 145 4-φ18
65LG(R)36-20 3 180 1120 90 304 300 248 4-φ23 185 65 145 4-M16 185 65 145 4-φ18
65LG(R)36-20 4 180 1185 90 363 300 248 4-φ23 185 65 145 4-M16 185 65 145 4-φ18
65LG(R)36-20 5 180 1295 90 422 300 248 4-φ23 185 65 145 4-M16 185 65 145 4-φ18
65LG(R)36-20 6 180 1390 90 481 300 248 4-φ23 185 65 145 4-M16 185 65 145 4-φ18
65LG(R)36-20 7 180 1455 90 540 300 248 4-φ23 185 65 145 4-M16 185 65 145 4-φ18
65LG(R)36-20 8 180 1615 90 599 300 248 4-φ23 185 65 145 4-M16 185 65 145 4-φ18

Model

 Stages L H H1 H2 B b n-φd Inlet Flange Outlet Flange
Dj Djn Dj2 n-dj Dc Dcn Dc2 n-φdc
80LG(R)50-20 2 187 965 112 301 315 272 4-φ23 200 80 160 8-M16 200 80 160 8-φ18
80LG(R)50-20 3 187 1195 112 379 315 272 4-φ23 200 80 160 8-M16 200 80 160 8-φ18
80LG(R)50-20 4 187 1270 112 457 315 272 4-φ23 200 80 160 8-M16 200 80 160 8-φ18
80LG(R)50-20 5 187 1395 112 535 315 272 4-φ23 200 80 160 8-M16 200 80 160 8-φ18
80LG(R)50-20 6 187 1505 112 613 315 272 4-φ23 200 80 160 8-M16 200 80 160 8-φ18
80LG(R)50-20 7 187 1675 112 691 315 272 4-φ23 200 80 160 8-M16 200 80 160 8-φ18
80LG(R)50-20 8 187 1755 112 769 315 272 4-φ23 200 80 160 8-M16 200 80 160 8-φ18
100LG72-20 2 187 1185 122 343 315 272 4-φ23 220 100 180 8-M16 220 100 180 8-φ18
100LG72-20 3 187 1270 122 432 315 272 4-φ23 220 100 180 8-M16 220 100 180 8-φ18
100LG72-20 4 187 1390 122 521 315 272 4-φ23 220 100 180 8-M16 220 100 180 8-φ18
100LG72-20 5 187 1580 122 610 315 272 4-φ23 220 100 180 8-M16 220 100 180 8-φ18
100LG72-20 6 187 1655 122 699 315 272 4-φ23 220 100 180 8-M16 220 100 180 8-φ18
100LG72-20 7 187 1800 122 788 315 272 4-φ23 220 100 180 8-M16 220 100 180 8-φ18
100LG72-20 8 187 1900 122 877 315 272 4-φ23 220 100 180 8-M16 220 100 180 8-φ18
100LG72-20 9 187 2100 122 966 315 272 4-φ23 220 100 180 8-M16 220 100 180 8-φ18

Rigid Connection

LG Series Vertical Multistage Pump – High-Rise Water Supply Type

1 Ball Valve 2 Flexible Joint 3 Pressure Gauge 4 Vacuum Gauge
5 Gate Valve 6 Elbow Pipe 7 Pressure Measuring Pipe 8 Concrete Base

Flexible Connection

LG Series Vertical Multistage Pump – High-Rise Water Supply Type

1 Ball Valve 2 Flexible Joint 3 Pressure Measuring Pipe 4 Gate Valve 5 Elbow Pipe
6 Pump 7 Connection Plate 8 JGD Vibration Isolator 9 Concrete Base

Installation Diagram（2）

 

LG Series Vertical Multistage Pump – High-Rise Water Supply Type

Installation Dimensions（2）

Model Connection Plate Dimensions Rigid Connection Concrete Base Dimensions
A×A B×B C×C H d1 d2 D×D E×E F×F H d h
25LG 190 340 400 60 φ14 or φ18 φ18 191 500 550 250 60 200
32LG 220 440 500 60 φ14 or φ18 φ18 219 500 550 250 60 200
40LG 220 440 500 60 φ14 or φ18 φ24 219 500 550 250 80 250
50LG 248 540 600 60 φ18 or φ22 φ24 248 550 600 350 80 250
65LG 248 540 600 60 φ18 or φ22 φ24 248 550 600 350 80 250
80LG 272 540 600 60 φ18 or φ22 φ24 272 600 650 350 80 250
100LG 272 540 600 60 φ22 φ24 272 600 650 350 80 250

OEM & Custom

Chaodun Pump provides OEM and ODM customization for LG vertical multistage pumps. Available materials: cast iron, stainless steel, bronze. Options for voltage, flange standard, outlet direction, and labeling. Suitable for distributors and project contractors worldwide.

FAQs

  1. What are LG pumps used for?
  2. LG pumps are widely used in high-rise building water supply, fire systems, and industrial circulation, providing efficient and stable water flow to meet various high-pressure demands.
  3. Can this pump handle hot water?
  4. Yes, the LG pump can handle hot water up to 105°C with the standard configuration, making it ideal for applications requiring hot water transport, such as HVAC and hot water supply systems.
  5. What’s the advantage of the detachable design?
  6. The detachable design makes maintenance more convenient, as users do not need to disassemble the piping or realign the motor. This reduces maintenance time and costs, enhancing ease of use.
  7. Do you offer OEM branding?
  8. Yes, we provide OEM services, including customized color, logo, and export packaging to meet the branding needs of different customers.
  9. Is the LG pump suitable for special liquids?
  10. Yes, the LG pump is made with corrosion-resistant materials and is suitable for handling chemical media, sewage, and other corrosive liquids, ensuring efficient operation in harsh environments.
  11. Can the LG pump handle corrosive liquids?
  12. Yes, the LG pump is designed with corrosion-resistant materials, making it ideal for pumping chemical media, sewage, and other corrosive liquids, ensuring long-term stable performance.
  13. How should I maintain the LG pump?
  14. It is recommended to regularly check the filter, replace seals, and lubricate the pump to ensure efficient operation. Regular maintenance helps extend the pump’s lifespan.
  15. What is the flow rate and head of the LG pump?
  16. The LG pump offers customized flow and head solutions to meet various application requirements, making it suitable for high-demand hydraulic systems.