GDL Vertical Multistage Centrifugal Pump High Efficiency, Compact

GDL Vertical Multistage Centrifugal Pump High Efficiency, Compact

GDL Vertical Inline Multistage Centrifugal Pump | High-efficiency stainless multistage boosting for clean-water systems

  • Stainless wetted end: Stamped/welded SS hydraulics for clean water and mildly corrosive media.
  • Vertical inline layout: Small footprint with direct pipeline installation.
  • Multistage pressure build: Stable boosting output for high-head system duty.
  • Broad system fit: Water supply, HVAC circulation, boiler feed, and industrial utility services.
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Product Overview

GDL Vertical Multistage Centrifugal Pump is a high-efficiency, vertical multistage centrifugal pump designed for water supply and pressure boosting in various industrial and commercial applications.

It addresses challenges in systems with high-rise applications or confined spaces by providing high head with compact vertical installation.

It is ideal for water treatment, HVAC systems, irrigation, and high-rise building water supply systems.

✔ For high-efficiency pumping systems requiring stable high-head performance in vertical configurations with minimal footprint

Model Designation

GDL Vertical Multistage Centrifugal Pump High Efficiency, Compact

Applications

Typical Operating Scenarios

• High-rise building water supply and pressure boosting systems

• HVAC chilled water and hot water circulation in commercial buildings

• Industrial process water supply and circulation

• Irrigation systems requiring continuous high-head performance

• Municipal water distribution systems requiring stable pressure

Engineering Advantages

Structural Design Logic & Engineering Outcome

• Vertical design reduces installation space and provides high-head performance.

• Multi-stage hydraulic design ensures efficiency and energy-saving in high-head applications.

• Modular construction simplifies maintenance and part replacement, enhancing system uptime.

• Standardized mechanical seals and bearings reduce wear and enhance pump reliability.

✔ For detailed performance data and customization options, consult the technical parameter tables below.

System Components

GDL Vertical Multistage Centrifugal Pump ：

• Pump casing and stage casings (multistage)

• Vertical shaft assembly

• Impellers and diffusers

• Mechanical seal and bearing assembly

• Motor coupling and vertical support system

Technical Specifications

Service Conditions

Designed for clean water or liquids with similar properties.

Not suitable for slurry or highly viscous media unless specified.

Operating Conditions

Flow rate: 3 – 300 m³/h
Head: 30 – 200 m
Power range: 1.1 – 315 kW
Speed: 2900 rpm
Liquid temperature: ≤ 85°C
Working pressure: ≤ 2.5 MPa

Detailed parameter tables are provided below.

Installation & Dimensions

Outline Drawing

GDL Vertical Multistage Centrifugal Pump High Efficiency, Compact
Performance Data

No. Name No. Name
1 Pump Body 11 Coupling
2 Tightening Bolt 12 Connecting Seat
3 Outer Casing 13 Air Vent
4 Impeller 14 Mechanical Seal
5 Impeller Sleeve 15 Shaft
6 Shaft Sleeve 16 Intermediate Section
7 Gasket 17 Shaft Sleeve Nut
8 Nut 18 Bearing Bush
9 Key 19 Return Pipe Assembly
10 Motor

Performance Curves

GDL Vertical Multistage Centrifugal Pump High Efficiency, Compact

Performance Parameters

Model Stages Flow Rate Head Speed Motor Power Efficiency NPSH (Required) 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 Rate Head Speed Motor Power Efficiency NPSH (Required) 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 Rate Head Speed Motor Power Efficiency NPSH (Required) 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 Rate Head Speed Motor Power Efficiency NPSH (Required) 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 Rate Head Speed Motor Power Efficiency NPSH (Required) 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 Rate Head Speed Motor Power Efficiency NPSH (Required) 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 Rate Head Speed Motor Power Efficiency NPSH (Required) 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 Rate Head Speed Motor Power Efficiency NPSH (Required) 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 Rate Head Speed Motor Power Efficiency NPSH (Required) 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 Rate Head Speed Motor Power Efficiency NPSH (Required) 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 Rate Head Speed Motor Power Efficiency NPSH (Required) 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 Rate Head Speed Motor Power Efficiency NPSH (Required) 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 Diagram

GDL Vertical Multistage Centrifugal Pump High Efficiency, Compact

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

How to Select a Pump Model

• Calculate the system’s total head and required flow rate based on application design.

• Verify installation space to ensure compatibility with vertical pump structure.

• Choose appropriate materials for wetted parts based on the characteristics of the fluid.

• Consider energy efficiency and operational cost to select the most suitable pump configuration.

✔ Final pump selection must be verified according to system duty point and site installation conditions.

Engineering Notes

• Ensure pump operates close to the rated duty point for optimal efficiency.

• Installation should include sufficient foundation support for the pump’s vertical load.

• Maintain proper alignment between motor and pump shaft to avoid wear.

• For high-temperature applications, ensure sufficient NPSH to prevent cavitation.

Compliance & Quality Assurance

• Factory hydraulic testing including full-flow and high-head performance tests

• Impeller dynamic balancing and rotor inspection

• Pressure casing and material certification

• Optional third-party inspection available

Safety Notice 

• Ensure proper priming before pump startup.

• Avoid dry-running of the pump.

• Disconnect power before maintenance or repairs.

• Do not exceed rated working pressure.

OEM & Customization

This pump series supports engineered configuration and duty-based matching. Technical adjustments can be made according to system requirements and installation conditions.

Available options include:
• Motor voltage & frequency
• Mechanical seal type and configuration
• Wetted parts material selection
• Surface coating and corrosion protection

Configuration is determined based on duty point and project specifications.

FAQs

Q1: Can the pump operate under VFD control?
Yes, VFD integration is possible for energy-efficient operation with variable flow.

Q2: What is the maximum allowable working pressure?
The maximum allowable working pressure is ≤ 2.5 MPa.

Q3: How is the pump material selected for different fluids?
Material selection depends on the fluid’s temperature, corrosiveness, and solids content.

Q4: What is the NPSH requirement for this pump?
NPSH requirement is provided in the pump performance curve for each duty point.

Q5: How often should the mechanical seal be replaced?
Mechanical seals should be inspected regularly and replaced every 2–3 years depending on system conditions.

Q6: Can this pump be used for wastewater applications?
This pump is designed for clean water; for wastewater, please consult for custom configurations.

Q7: Can the pump be installed horizontally?
This pump is designed for vertical installation only for optimal performance.