GDL Vertical Multistage Centrifugal Pump for Clean Water

GDL Vertical Multistage Centrifugal Pump for Clean Water

GDL Vertical Multistage Pump

  • Compact vertical multistage design
  • Stable continuous-duty, low vibration operation
  • Inline inlet/outlet with durable mechanical seal
  • High-pressure vertical multistage pump for building, industrial and municipal use.
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Product Overview

GDL Vertical Multistage Centrifugal Pump is an inline vertical high-pressure multistage pump designed for building water supply and industrial boosting systems.

It is engineered to deliver stable high head and constant pressure under continuous-duty operation where pipeline boosting and elevation lifting are required.

It is typically applied in high-rise water supply, fire-fighting booster systems, HVAC circulation and industrial process water transfer.

✔ Technical datasheet and duty-based selection support are available upon request.

Model Designation

GDL Vertical Multistage Centrifugal Pump for Clean WaterApplication

  • High-rise building secondary water supply with rooftop tank boosting
  • Fire pipeline pressurization systems requiring vertical inline installation
  • HVAC chilled and hot water circulation loops
  • Industrial clean water transfer with pressure stabilization demand
  • Municipal pipeline pressure compensation stations

Engineering Advantages

  • Vertical inline structure minimizes footprint and aligns with pipeline layout, reducing installation complexity and civil cost.
  • Multistage impeller hydraulic design enables high head output under moderate motor power consumption.
  • Coaxial suction and discharge configuration ensures hydraulic balance and stable axial load distribution.
  • Cartridge-type mechanical seal simplifies maintenance and reduces downtime.
  • Smooth performance curve supports stable operation near rated duty point.
✔ Engineered for high-head inline boosting applications where space efficiency and pressure stability are critical.

System Components

GDL Vertical Multistage Centrifugal Pump：

  • Electric motor (TEFC or equivalent standard motor)
  • Pump shaft and multistage impeller assembly
  • Diffuser and stage casing sections
  • Mechanical seal assembly
  • Pump head and base
  • Inlet and outlet flanges (inline configuration)

The structure adopts sectional stage assembly with tie-bolt compression for pressure containment.

Technical Specifications

Service Conditions

  • Medium: Clean water or non-corrosive liquids with similar physical and chemical properties to water
  • Maximum ambient temperature: 40°C
  • Installation: Indoor vertical installation
  • Continuous-duty operation (S1)

Operating Conditions

Flow rate: 2 – 160 m³/h
Head: 24 – 200 m
Power range: 1.1 – 90kW
Speed: 2900 rpm
Liquid temperature: ≤ 80°C (standard), higher temp. available
Working pressure: ≤ 2.5 MPa

Detailed parameter tables are provided below.

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

How to Select a Pump Model

  1. Confirm required flow rate (m³/h) under peak and normal operating conditions.
  2. Determine total dynamic head including elevation difference and pipeline loss.
  3. Verify system working pressure does not exceed 2.5 MPa.
  4. Select motor power based on duty point within high-efficiency range of performance curve.
  5. Confirm medium temperature and compatibility with standard seal configuration.
✔ Model selection shall be based strictly on duty point and hydraulic performance curve to ensure long-term operational stability.

Engineering Notes

  • The GDL pump is not designed for liquids containing solid particles or fibers.
  • Operation below minimum flow may cause overheating and seal damage.
  • Parallel pump configuration is recommended for variable load conditions.
  • Ensure NPSH available exceeds required value to avoid cavitation.

Compliance & Quality Assurance

  • Factory hydraulic performance test before shipment
  • Pressure containment test for pump casing
  • Rotor dynamic balance verification
  • Mechanical seal inspection and leakage test
  • Material traceability documentation available upon request
  • Optional third-party inspection prior to dispatch

Safety Notice

  • Do not operate under dry-running condition
  • Ensure suction priming before startup
  • Disconnect power before maintenance
  • 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

Q: Can the GDL pump operate under VFD control?
A: Yes, frequency conversion is allowed provided operation remains within rated performance curve range.

Q: What is the maximum allowable working pressure?
A: The maximum working pressure is 2.5 MPa.

Q: What type of mechanical seal is used?
A: Standard single mechanical seal; cartridge or high-temperature variants are optional.

Q: Is the pump suitable for hot water circulation?
A: Standard version supports ≤80°C; higher temperature configuration is available.

Q: Can the pump be installed outdoors?
A: Standard configuration is for indoor installation; outdoor use requires protective enclosure.

Q: How is cavitation avoided in this pump?
A: Ensure adequate NPSH available and avoid operation below minimum flow rate.

Q: Can multiple pumps operate in parallel?
A: Yes, parallel configuration is recommended for large flow demand systems.