GDL Vertical Multistage Centrifugal Pump for Clean Water

GDL Vertical Multistage Centrifugal Pump for Clean Water

GDL Vertical Inline Multistage Clean-Water Pump | Inline fitment for stable continuous duty

  • Inline coaxial ports: Same-size, same-centerline inlet/outlet for direct pipeline fitment.
  • Compact vertical design: Small footprint for tight installations.
  • Stable, low-vibration running: Aligned structure for smooth continuous duty.
  • Seal & pressure matching: Hard-alloy mechanical seal; stages set to system pressure.
View details Contact us

Product Overview

The GDL vertical, easy-dismantling multistage clean-water pump is a vertical multistage centrifugal unit designed with modular and enclosed structure. It is developed specifically for high-rise building water supply, fire protection, and building service systems. With a compact structure, stable operation, and easy maintenance, it is ideal for booster systems and pump rooms requiring high continuity, safety, and space efficiency.

Model Designation

GDL Vertical Multistage Centrifugal Pump for Clean Water

Key Features

  • Compact vertical multistage design with small footprint, suitable for limited space installation; optional protective cover available for outdoor use.

  • Impellers are directly mounted on the motor shaft, ensuring coaxial alignment for smooth operation and extended service life.

  • Mechanical seal or cartridge seal system equipped with high-hardness alloy seal rings offers high wear resistance and long seal life.

  • Equal-diameter suction and discharge ports; inlet/outlet orientation configurable at 0°, 90°, 180°, or 270°; supports series or parallel operation; head adjustable via stage count or impeller trimming.

Engineering Summary

The GDL pump adopts a sealed close-coupled structure with a reliable hydraulic model design, ensuring high hydraulic efficiency and stable head–flow characteristics. It is directly coupled to a Y-series three-phase asynchronous motor via a clamp-type coupling, achieving high alignment accuracy and reducing vibration and noise. With strong structural rigidity, standardized motor configuration, and easy maintenance design, it is suitable for integrated pump room applications and long-term continuous operation.

Typical Applications

  • Constant-pressure water supply and boosting for high-rise and super high-rise buildings

  • Main supply and pressure stabilization for fire hydrant and automatic sprinkler systems

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

  • Make-up and circulation water for cooling towers, system pressure balancing

  • Boiler feedwater and long-distance clean water transfer

Suitable for clean water at temperatures up to 80°C; hot water versions can handle up to 105°C. With appropriate materials and defined operating conditions, it can also transport non-corrosive liquids with physical and chemical properties similar to water, ensuring stable and reliable system performance.

System & Operation

Components & Supply

  • Pump and motor adopt a close-coupled direct-drive structure, forming a rigid unit that requires no on-site alignment.

  • Driven by a standard Y-series three-phase asynchronous motor, with good interchangeability and ease of maintenance.

  • Clamp-type coupling ensures coaxial alignment between pump and motor shafts for smooth, stable transmission.

  • The modular design allows easy disassembly for mechanical seal replacement and internal inspection

Technical Specifications

Operating Conditions

  • The pumped medium should be physically and chemically similar to clean water, non-corrosive, particle-free, and with viscosity ≤150 mm²/s.

  • Suitable temperature range: −15°C to 120°C; standard models up to 80°C; hot-water versions up to 105°C.

  • Maximum system working pressure: ≤2.5 MPa.

  • Installation altitude should not exceed 1000 m; for higher elevations, specify at time of order for proper configuration.

Service Conditions

  • Ambient temperature ≤40°C; relative humidity ≤95%.

  • Indoor installation is recommended; outdoor installations require protective covers and proper environmental protection.

  • Avoid explosive or corrosive atmospheres and extreme humidity or heat.

  • Adequate ventilation and a stable foundation are essential to prevent vibration during operation.

Protection Functions

  • Motor should be equipped with thermal overload protection to prevent damage under overcurrent conditions.

  • Level or flow sensors can be installed to prevent dry running.

  • Check valves are recommended in discharge lines to prevent reverse flow and water hammer.

  • Overpressure protection devices should be included to ensure system pressure remains within rated limits (≤2.5 MPa).

Selection Criteria

  • Select pump model and number of stages based on system head and flow requirements, ensuring duty point falls within high-efficiency range.

  • Choose standard or hot-water configuration according to medium temperature and characteristics; for special media, select appropriate materials and seals.

  • Consider installation environment (indoor/outdoor/high altitude) to define motor protection level and structural configuration.

  • Confirm whether the system requires series or parallel operation and ensure inlet/outlet orientation (0°/90°/180°/270°) suits piping layout.

  • For continuous-duty or high-availability systems, consider standby pump or dual-pump switching to ensure uninterrupted operation and maintainability.

Installation & Dimensions

Outline Drawing

GDL Vertical Multistage Centrifugal Pump for Clean Water Serial No. Name Serial No. Name
1 Pump Body 11 Coupling
2 Tightening Bolt 12 Connecting Seat
3 Outer Casing 13 Air Nozzle
4 Impeller 14 Mechanical Seal
5 Impeller Sleeve 15 Shaft
6 Shaft Sleeve 16 Middle Section
7 Seal Gasket 17 Shaft Sleeve Nut
8 Nut 18 Sleeve Bearing
9 Pin 19 Return Pipe Assembly
10 Motor

Performance Curves

GDL Vertical Multistage Centrifugal Pump for Clean Water

Performance Parameters

Model Stages Flow Head Speed Motor Power Efficiency Required NPSH Weight
m3/h M r/min kw % NPSH KG
25GDL2-12 3 2 36 2900 1.1 30 2.9 58
25GDL2-12 4 2 48 2900 1.1 30 2.9 62
25GDL2-12 5 2 60 2900 2 30 2.9 68
25GDL2-12 6 2 72 2900 2 30 2.9 72
25GDL2-12 7 2 84 2900 2 30 2.9 78
25GDL2-12 8 2 96 2900 2.2 30 2.9 82
25GDL2-12 9 2 108 2900 2 30 2.9 86
25GDL2-12 10 2 120 2900 3 30 2.9 98
25GDL2-12 11 2 132 2900 3 30 2.9 102
25GDL2-12 12 2 144 2900 3 30 2.9
25GDL2-12 13 2 156 2900 4 30 2.9
25GDL2-12 14 2 168 2900 4 30 2.9
25GDL2-12 15 2 180 2900 4 30 2.9
Model Stages Flow Head Speed Motor Power Efficiency Required NPSH Weight
m3/h M r/min kw % NPSH KG
25GDL4-11 3 4 33 2900 1.1 42 2.9 58
25GDL4-11 4 4 44 2900 1.5 42 2.9 65
25GDL4-11 5 4 55 2900 2.2 42 2.9 72
25GDL4-11 6 4 66 2900 2.2 42 2.9 76
25GDL4-11 7 4 77 2900 3 42 2.9 86
25GDL4-11 8 4 88 2900 3 42 2.9 90
25GDL4-11 9 4 99 2900 3 42 2.9 94
25GDL4-11 10 4 110 2900 4 42 2.9 110
25GDL4-11 11 4 121 2900 4 42 2.9 114
25GDL4-11 12 4 132 2900 4 42 2.9
25GDL4-11 13 4 143 2900 4 42 2.9
25GDL4-11 14 4 154 2900 5.5 42 2.9
25GDL4-11 15 4 165 2900 5.5 42 2.9
Model Stages Flow Head Speed Motor Power Efficiency Required NPSH Weight
m3/h M r/min kw % NPSH KG
40GDL6-12 3 6 36 2900 1.5 52 2.9 72
40GDL6-12 4 6 48 2900 2.2 52 2.9 78
40GDL6-12 5 6 60 2900 2.2 52 2.9 82
40GDL6-12 6 6 72 2900 3 52 2.9 92
40GDL6-12 7 6 84 2900 3 52 2.9 96
40GDL6-12 8 6 96 2900 4 52 2.9 112
40GDL6-12 9 6 108 2900 4 52 2.9 116
40GDL6-12 10 6 120 2900 4 52 2.9 120
40GDL6-12 11 6 132 2900 5.5 52 2.9 140
40GDL6-12 12 6 144 2900 5.5 52 2.9
40GDL6-12 13 6 156 2900 7.5 52 2.9
40GDL6-12 14 6 168 2900 7.5 52 2.9
40GDL6-12 15 6 180 2900 7.5 52 2.9
Model Stages Flow Head Speed Motor Power Efficiency Required NPSH Weight
m3/h M r/min kw % NPSH KG
50GDL12-15 2 12 30 2900 2.2 57 3.5 113
50GDL12-15 3 12 45 2900 3 57 3.5 129
50GDL12-15 4 12 60 2900 4 57 3.5 149
50GDL12-15 5 12 75 2900 5.5 57 3.5 181
50GDL12-15 6 12 90 2900 5.5 57 3.5 190
50GDL12-15 7 12 105 2900 7.5 57 3.5 204
50GDL12-15 8 12 120 2900 7.5 57 3.5 212
50GDL12-15 9 12 135 2900 11 57 3.5 265
50GDL12-15 10 12 150 2900 11 57 3.5 273
Model Stages Flow Head Speed Motor Power Efficiency Required NPSH Weight
m3/h M r/min kw % NPSH KG
50GDL18-15 2 18 30 2900 3 63 4.0 122
50GDL18-15 3 18 45 2900 4 63 4.0 142
50GDL18-15 4 18 60 2900 5.5 63 4.0 175
50GDL18-15 5 18 75 2900 7.5 63 4.0 189
50GDL18-15 6 18 90 2900 7.5 63 4.0 198
50GDL18-15 7 18 105 2900 11 63 4.0 252
50GDL18-15 8 18 120 2900 11 63 4.0 261
50GDL18-15 9 18 135 2900 15 63 4.0 280
50GDL18-15 10 18 150 2900 15 63 4.0 289
Model Stages Flow Head Speed Motor Power Efficiency Required NPSH Weight
m3/h M r/min kw % NPSH KG
65GDL24-12 2 24 24 2900 3 63 4.0 122
65GDL24-12 3 24 36 2900 4 63 4.0 142
65GDL24-12 4 24 48 2900 5.5 63 4.0 175
65GDL24-12 5 24 60 2900 7.5 63 4.0 189
65GDL24-12 6 24 72 2900 7.5 63 4.0 252
65GDL24-12 7 24 84 2900 11 63 4.0 261
65GDL24-12 8 24 96 2900 11 63 4.0 280
65GDL24-12 9 24 108 2900 15 63 4.0 289
65GDL24-12 10 24 120 2900 15 63 4.0 298
65GDL24-12 11 24 132 2900 15 63 4.0 317
65GDL24-12 12 24 144 2900 18.5 63 4.0 346
Model Stages Flow Head Speed Motor Power Efficiency Required NPSH Weight
m3/h M r/min kw % NPSH KG
80GDL36-12 2 36 24 2900 4 71 4.2 193
80GDL36-12 3 36 36 2900 5.5 71 4.2 227
80GDL36-12 4 36 48 2900 7.5 71 4.2 244
80GDL36-12 5 36 60 2900 11 71 4.2 292
80GDL36-12 6 36 72 2900 11 71 4.2 302
80GDL36-12 7 36 84 2900 15 71 4.2 322
80GDL36-12 8 36 96 2900 15 71 4.2 332
80GDL36-12 9 36 108 2900 18.5 71 4.2 365
80GDL36-12 10 36 120 2900 18.5 71 4.2 375
Model Stages Flow Head Speed Motor Power Efficiency Required NPSH Weight
m3/h M r/min kw % NPSH KG
80GDL54-14 2 54 28 2900 7.5 73 4.0 218
80GDL54-14 3 54 42 2900 11 73 4.0 267
80GDL54-14 4 54 56 2900 15 73 4.0 287
80GDL54-14 5 54 70 2900 18.5 73 4.0 320
80GDL54-14 6 54 84 2900 18.5 73 4.0 330
80GDL54-14 7 54 98 2900 22 73 4.0 373
80GDL54-14 8 54 112 2900 30 73 4.0 400
80GDL54-14 9 54 126 2900 30 73 4.0 421
80GDL54-14 10 54 140 2900 37 73 4.0 432
Model Stages Flow Head Speed Motor Power Efficiency Required NPSH Weight
m3/h M r/min kw % NPSH KG
100GDL72-14 2 72 28 2900 11 73 4.5 276
100GDL72-14 3 72 42 2900 15 73 4.5 298
100GDL72-14 4 72 56 2900 18.5 73 4.5 336
100GDL72-14 5 72 70 2900 22 73 4.5 381
100GDL72-14 6 72 84 2900 30 73 4.5 453
100GDL72-14 7 72 98 2900 30 73 4.5 466
100GDL72-14 8 72 112 2900 37 73 4.5 493
100GDL72-14 9 72 126 2900 37 73 4.5 582
100GDL72-14 10 72 140 2900 45 73 4.5 595
Model Stages Flow Head Speed Motor Power Efficiency Required NPSH Weight
m3/h M r/min kw % NPSH KG
100GDL100-20 2 108 40 2900 18.5 74 4.5 292
100GDL100-20 3 108 60 2900 30 74 4.5 430
100GDL100-20 4 108 80 2900 37 74 4.5 463
100GDL100-20 5 108 100 2900 45 74 4.5 555
100GDL100-20 6 108 120 2900 55 74 4.5 640
100GDL100-20 7 108 140 2900 75 74 4.5 840
100GDL100-20 8 108 160 2900 75 74 4.5 855
100GDL100-20 9 108 180 2900 90 74 4.5 870
100GDL100-20 10 108 200 2900 90 74 4.5 955
Model Stages Flow Head Speed Motor Power Efficiency Required NPSH Weight
m3/h M r/min kw % NPSH KG
125GDL100-20 2 108 40 2900 18.5 74 4.5 292
125GDL100-20 3 108 60 2900 30 74 4.5 430
125GDL100-20 4 108 80 2900 37 74 4.5 463
125GDL100-20 5 108 100 2900 45 74 4.5 555
125GDL100-20 6 108 120 2900 55 74 4.5 640
125GDL100-20 7 108 140 2900 75 74 4.5 840
125GDL100-20 8 108 160 2900 75 74 4.5 855
125GDL100-20 9 108 180 2900 90 74 4.5 870
125GDL100-20 10 108 200 2900 90 74 4.5 955
Model Stages Flow Head Speed Motor Power Efficiency Required NPSH Weight
m3/h M r/min kw % NPSH KG
150GDL160-20 2 160 40 2900 30 78 4.5 422
150GDL160-20 3 160 60 2900 37 78 4.5 452
150GDL160-20 4 160 80 2900 55 78 4.5 613
150GDL160-20 5 160 100 2900 75 78 4.5 820
150GDL160-20 6 160 120 2900 75 78 4.5 836
150GDL160-20 7 160 140 2900 90 78 4.5 922

Installation Dimensions

GDL Vertical Multistage Centrifugal Pump for Clean Water

Performance Data
Model H1 L B 4-φd1 Inlet Flange (J)
DN N-φD2 φD
25GDL 60 300 200 4-φ18 25 4-φ14 85
40GDL 80 360 235 4-φ18 40 4-φ18 110
50GDL 100 360 235 4-φ18 50 4-φ18 125
65GDL 110 360 235 4-φ18 65 4-φ18 145
80GDL 130 420 300 4-φ18 80 8-φ18 160
100GDL 160 520 350 4-φ18 100 8-φ18 180
125GDL 160 500 400 4-φ18 125 8-φ18 210
150GDL 180 600 400 4-φ18 150 8-φ22 245

OEM & Custom

Chaodun Pump provides OEM and ODM customization for GDL vertical multistage centrifugal pumps. Available materials include cast iron, stainless steel, or duplex alloy. Custom options include flange type, impeller size, voltage, and export packaging. Suitable for distributors and system integrators worldwide.

FAQs

1. What applications are suitable for GDL pumps?
Mainly for high-rise building water supply, fire protection, HVAC, and industrial water circulation.

2. Can this pump handle hot water?
Yes, up to 120°C under standard configuration.

3. Are OEM or branding services available?
Yes, Chaodun Pump provides OEM labeling, packaging, and custom color.

4. What’s the standard warranty?
12 months from shipment; extended warranty available.

5. What is the maximum pressure?
System pressure ≤ 2.0 MPa.