GC Series Horizontal Multistage Boiler Feed Pump – Hot Water Type

GC Series Horizontal Multistage Boiler Feed Pump – Hot Water Type

GC Series Horizontal Multistage Boiler Feed Pump – Hot Water Type

  • Horizontal multistage pump for boiler feed and hot-water circulation up to 120°C, ensuring stable pressure and long service life.
  • Optimized hydraulics for boiler feed, energy-efficient continuous duty
  • Modular multistage design, head up to 400m, peak efficiency
  • Axial thrust balancing extends bearing life, reduces vibration
  • Back-pullout design, quick in-line service without pipe disconnection
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Product Overview

The GC Series Horizontal Multistage Boiler Feed Pump is a single-suction centrifugal pump designed for continuous, reliable operation in boiler feed and make-up water systems.

It handles high-load and fluctuating water quality conditions, providing efficient energy transfer for optimal stability and low energy consumption.

Ideal for industrial, municipal, and high-rise building water systems, ensuring reliable performance in boiler systems, pressure vessel water supply, and hot water circulation.

✔ For accurate pump selection and head matching, please consult with our technical team.

Model Designation

GC Series Horizontal Multistage Boiler Feed Pump – Hot Water Type

Applications

The GC series pump is widely used in:

  • Industrial & municipal boiler feedwater systems
  • High-rise building water supply & firefighting boosting
  • Food, pharmaceutical & hygiene-critical processing
  • Aquaculture, environmental protection & special applications
✔ It is designed to handle clean water or non-corrosive liquids with similar physical and chemical properties to water.

Engineering Advantages

  • The GC Series Horizontal Boiler Feed Pump features a sectional multistage structure, allowing flexible adjustment of the pump head by adding or removing stages.
  • The pump’s modular design ensures ease of inspection and maintenance, making it ideal for continuous operations in industrial and municipal systems.
  • The precise coaxial alignment between impeller outlets and diffuser inlets enhances operational efficiency, reducing wear and tear during use.
✔ For more information on the advantages of the GC series pump, please contact our technical support team.

System Components

The GC series pump consists of the following key components:

  • Shaft and shaft sleeves
  • Impellers and diffusers
  • Seal rings
  • Intermediate and discharge sections
  • Balancing disc and rear cover
  • High-quality carbon steel shaft and cast iron components

Technical Specifications

  • Flow rate: 6 – 55 m³/h
  • Head: 46 – 576 m
  • Power range: 3 – 100 kW
  • Speed: 2920 – 2950 rpm
  • Liquid temperature: ≤ 110°C
  • Working pressure: ≤ 4.0 MPa

Service Conditions

  • The installation site should be free from explosive gases or aggressive media.
  • Recommended ambient temperature ≤ 40°C, relative humidity ≤ 95%.
  • The foundation must be stable to prevent vibration and ensure long-term performance.

nstallation & Dimensions

Outline Drawing

GC Series Horizontal Multistage Boiler Feed Pump – Hot Water Type

Performance Data

1 Shaft Sleeve Nut 2 Bearing Cover 3 Bearing 4 Front Bearing Housing 5 Front Shaft Sleeve 6 Packing Gland 7 Packing Ring
8 Seal Ring 9 Suction Section 10 Impeller 11 Middle Section 12 Return Pipe 13 Discharge Section 14 Balance Ring
15 Balance Plate 16 Tail Cover 17 Rear Shaft Sleeve 18 Shaft 19 Round Nut 20 Tightening Bolt

Performance Parameters

 Model Stages Flow Rate Total Head Rotational Speed Power (kW) Efficiency (η) NPSHr Impeller Diameter Weight
m3/h L/S m r/min Light-load Power Motor Power % m mm Kg
11/2GC-5 2 6 1.66 46 2950 2 3 38 3.7 136 135
11/2GC-5 3 6 1.66 69 2920 3 4 38 3.7 136 147
11/2GC-5 4 6 1.66 92 2920 4 5.5 38 3.7 136 174
11/2GC-5 5 6 1.66 115 2920 5 7.5 38 3.7 136 204
11/2GC-5 6 6 1.66 138 2920 6 7.5 38 3.7 136 212
11/2GC-5 7 6 1.66 161 2920 7 7.5 38 3.7 136 220
11/2GC-5 8 6 1.66 184 2920 8 11 38 3.7 136 271
11/2GC-5 9 6 1.66 207 2920 9 15 38 3.7 136 292
 Model Stages Flow Rate Total Head Rotational Speed Power (kW) Efficiency (η) NPSHr Impeller Diameter Weight
m3/h L/S m r/min Light-load Power Motor Power % m mm Kg
2GC-5 2 10 2.8 64 2950 4.4 7.5 39.6 4.7 166 258
2GC-5 3 10 2.8 96 2950 6.6 11 39.6 4.7 166 309
2GC-5 4 10 2.8 128 2950 8.8 15 39.6 4.7 166 389
2GC-5 5 10 2.8 160 2950 11.0 15 39.6 4.7 166 414
2GC-5 6 10 2.8 192 2950 13.2 18.5 39.6 4.7 166 512
2GC-5 7 10 2.8 224 2950 15.4 22.0 39.6 4.7 166 531
2GC-5 8 10 2.8 256 2950 17.6 30.0 39.6 4.7 166 589
2GC-5 9 10 2.8 288 2950 19.8 30.0 39.6 4.7 166 609
 Model Stages Flow Rate Total Head Rotational Speed Power (kW) Efficiency (η) NPSHr Impeller Diameter Weight
m3/h L/S m r/min Light-load Power Motor Power % m mm Kg
21/2GC-3.5 7
10
15
20
2.8
4.2
5.6
336
315
280
 2950
26
28.6
32.5
 37
35
45
47
3.3
3.8
4
 198 967
21/2GC-3.5 8
10
15
20
2.8
4.2
5.6
384
360
320
 2950
30
32.8
37
 45
35
45
47
3.3
3.8
4
 198 1065
21/2GC-3.5 9
10
15
20
2.8
4.2
5.6
432
405
360
 2950
33.7
37
42
 55
35
45
47
3.3
3.8
4
 198 1097
21/2GC-3.5 10
10
15
20
2.8
4.2
5.6
480
450
400
 2950
37.5
41
46.5
 55
35
45
47
3.3
3.8
4
 198 1179
21/2GC-3.5 11
10
15
20
2.8
4.2
5.6
528
495
440
 2950
41.5
45
51
 75
35
45
47
3.3
3.8
4
 198 1252
21/2GC-3.5 12
10
15
20
2.8
4.2
5.6
576
540
480
 2950
45
49
56
 75
35
45
47
3.3
3.8
4
 198 1324
 Model Stages Flow Rate Total Head Rotational Speed Power (kW) Efficiency (η) NPSHr Impeller Diameter Weight
m3/h L/S m r/min Light-load Power Motor Power % m mm Kg
21/2GC-6 2
15
20
4.2
5.6
62
54
 2950
5.8
6.2
 7.5
43.7
47.4
5
5.3
 168 258
21/2GC-6 3
15
20
4.2
5.6
93
81
 2950
8.7
9.3
 15
43.7
47.4
5
5.3
 168 309
21/2GC-6 4
15
20
4.2
5.6
124
108
 2950
11.6
12.4
 18.5
43.7
47.4
5
5.3
 168 389
21/2GC-6 5
15
20
4.2
5.6
155
135
 2950
14.5
15.5
 22.0
43.7
47.4
5
5.3
 168 494
21/2GC-6 6
15
20
4.2
5.6
186
162
 2950
17.4
18.6
 22.0
43.7
47.4
5
5.3
 168 512
21/2GC-6 7
15
20
4.2
5.6
217
189
 2950
20.2
21.7
 30.0
43.7
47.4
5
5.3
 168 563
21/2GC-6 8
15
20
4.2
5.6
248
216
 2950
23.2
24.8
 30.0
43.7
47.4
5
5.3
 168 589
21/2GC-6 9
15
20
4.2
5.6
279
243
 2950
26.1
27.9
 37.0
43.7
47.4
5
5.3
 168 785
 Model Stages Flow Rate Total Head Rotational Speed Power (kW) Efficiency (η) NPSHr Impeller Diameter Weight
m3/h L/S m r/min Light-load Power Motor Power % m mm Kg
4GC-8 2
30
45
55
8.3
12.5
15.3
86
82
79
 2950
13.8
16.8
18.1
 22
51
60
62.5
4.6
5
5.6
 192 503
4GC-8 3
30
45
55
8.3
12.5
15.3
129
123
114
 2950
20.7
25.2
27.2
 30
51
60
62.5
4.6
5
5.6
 192 612
4GC-8 4
30
45
55
8.3
12.5
15.3
172
164
152
 2950
27.6
33.6
35.2
 45
51
60
62.5
4.6
5
5.6
 192 835
4GC-8 5
30
45
55
8.3
12.5
15.3
215
205
190
 2950
34.5
42
45.3
 55
51
60
62.5
4.6
5
5.6
 192 950
4GC-8 6
30
45
55
8.3
12.5
15.3
258
246
228
 2950
41.4
50.4
54.4
 55
51
60
62.5
4.6
5
5.6
 192 1085
4GC-8 7
30
45
55
8.3
12.5
15.3
301
287
266
 2950
48.3
58.8
63.4
 75
51
60
62.5
4.6
5
5.6
 192 1087
4GC-8 8
30
45
55
8.3
12.5
15.3
344
328
304
 2950
55
67
73
 75
51
60
62.5
4.6
5
5.6
 192
4GC-8 9
30
45
55
8.3
12.5
15.3
387
369
342
 2950
62
75.5
82
 90
51
60
62.5
4.6
5
5.6
 192
4GC-8 10
30
45
55
8.3
12.5
15.3
430
410
380
 2950
69
84
91
 100
51
60
62.5
4.6
5
5.6
 192

Installation Dimensions

GC Series Horizontal Multistage Boiler Feed Pump – Hot Water Type

Performance Data（2）

Model Number of Stages A B C E H I J K L M N O P Q F n-φd
11/2GC-5 2 963 750 510 128 248 122.5 355 350 205 365 105 180 315 315 154 4-φ20
11/2GC-5 3 1033 805 535 125 248 172.5 355 358 205 405 115 190 355 355 154 4-φ20
11/2GC-5 4 1158 1010 715 135 248 222.5 360 393 205 415 135 210 365 365 47 4-φ20
11/2GC-5 5 1208 1010 715 135 248 272.5 360 393 205 415 135 210 365 365 97 4-φ20
11/2GC-5 6 1258 1010 715 135 248 322.5 360 393 205 415 135 210 365 365 147 4-φ20
11/2GC-5 7
1308
1433
1060
1180
715
760
135
170
 248 372.5 360
393
495
 205
415
470
135
163
210
255
 365
365
240
147
100
 4-φ20
11/2GC-5 8 1484 1280 785 170 248 422.5 395 470 205 470 165 255 365 420 95 4-φ20
11/2GC-5 9 1533 1280 785 170 248 472.5 395 470 205 470 165 255 365 420 145 4-φ20
Model Number of Stages A B C E H I J K L M N O P Q F n-φd
2GC-5 2 1227 915 650 135 325 160 480 443 255 490 135 210 430 430 211 4-φ24
2GC-5 3 1412 1160 790 165 325 220 485 490 255 480 165 255 430 430 141 4-φ24
2GC-5 4 1412 1160 790 165 325 280 485 490 255 480 165 255 430 430 201 4-φ24
2GC-5 5 1532 1220 820 165 325 340 485 490 255 480 165 255 430 430 201 4-φ24
2GC-5 6 1637 1320 860 185 325 400 485 490 255 480 165 255 430 430 203 4-φ24
2GC-5 7 1722 1380 900 200 325 460 480 510 255 515 180 285 455 455 209 4-φ24
2GC-5 8 1887 1575 1000 240 325 520 525 580 255 585 200 310 440 525 150 4-φ24
2GC-5 9 1947 1575 1000 240 325 580 525 580 255 585 200 310 440 525 210 4-φ24
Model Number of Stages A B C E H I J K L M N O P Q F n-φd
21/2GC-3.5 7 1937 1590 1030 225 385 470 608 598 295 600 200 310 540 540 195 4-φ24
21/2GC-3.5 8 1937 1675 1085 225 385 530 618 638 295 600 225 345 540 540 194 4-φ24
21/2GC-3.5 9 2212 1835 1170 265 385 590 643 683 295 600 250 385 540 610 192 4-φ24
21/2GC-3.5 10 2272 1895 1200 265 385 650 643 683 295 600 250 385 540 610 192 4-φ24
21/2GC-3.5 11 2402 2115 1280 320 385 710 675 750 295 715 280 410 530 655 131 4-φ24
21/2GC-3.5 12 2462 2115 1280 320 385 770 675 750 295 715 280 410 530 655 191 4-φ24
Model Number of Stages A B C E H I J K L M N O P Q F n-φd
21/2GC-6 2 1227 915 650 135 325 160 480 443 255 490 135 210 430 430 211 4-φ24
21/2GC-6 3 1412 1160 790 165 325 220 485 490 255 480 165 255 430 430 141 4-φ24
21/2GC-6 4 1412 1160 790 165 325 280 485 490 255 480 165 255 430 430 201 4-φ24
21/2GC-6 5 1577 1320 860 185 325 340 485 490 255 480 165 255 430 430 143 4-φ24
21/2GC-6 6 1662 1380 900 200 325 400 480 510 255 515 180 285 455 455 149 4-φ24
21/2GC-6 7 1827 1575 1000 240 325 460 525 580 255 585 200 310 440 525 90 4-φ24
21/2GC-6 8 1887 1575 1000 240 325 520 525 580 255 585 200 310 440 525 150 4-φ24
21/2GC-6 9 1947 1575 1000 240 325 525 525 580 255 585 200 310 440 525 210 4-φ24
Model Number of Stages A B C E H I J K L M N O P Q F n-φd
4GC-8 2 1552 1230 845 190 385 190 610 575 295 600 180 285 540 480 185 4-φ24
4GC-8 3 1732 1385 925 225 385 265 610 600 295 600 200 310 540 540 185 4-φ24
4GC-8 4 1847 1485 980 235 385 340 620 640 295 600 225 345 540 540 184 4-φ24
4GC-8 5 2037 1735 1105 265 385 415 645 685 295 665 250 385 540 605 117.5 4-φ24
4GC-8 6 2112 1735 1105 265 385 490 645 685 295 665 250 385 540 605 192.5 4-φ24
4GC-8 7 2257 1955 1215 300 385 565 675 750 295 720 280 410 540 660 116.5 4-φ24
4GC-8 8 2332 1955 1215 300 385 640 675 750 295 720 280 410 540 660 191.5 4-φ24
4GC-8 9 2457 2080 1295 325 385 715 675 750 295 720 280 410 540 660 191.5 4-φ24

Outline Drawing（2）

GC Series Horizontal Multistage Boiler Feed Pump – Hot Water Type

Performance Data（2）

Size Suction Flange
Model Dg Do D n-do
11/2GC-5 40 115 145 4-φ18
2GC-5 50 125 160 4-φ18
21/2GC-6 65 145 180 8-φ18

Pump Head Equation:

GC Series Horizontal Multistage Boiler Feed Pump – Hot Water Type

P1: Inlet

Parameter Definitions and Installation Height Calculation

  • P₂: Outlet pressure of the pump (MPa)
  • Z₁: Vertical distance from inlet pressure gauge to pump shaft center (m)
  • Z₂: Vertical distance from outlet pressure gauge to pump shaft center (m)
  • V₁: Flow velocity at the inlet pressure measurement point (m/s)
  • V₂: Flow velocity at the outlet pressure measurement point (m/s)
  • ρ: Liquid density (kg/m³)
  • g: Gravitational acceleration (9.8 m/s²)
  • Hg: Pump installation height — the vertical distance from the pump shaft centerline to the inlet liquid level (m)

Explanation of Parameters in Installation Height Formula

  • P₀: Atmospheric pressure or absolute pressure at the water surface (expressed in meters of water column)
  • [NPSH]: Net Positive Suction Head required by the pump (m)
  • P′: Vapor pressure of the pumped liquid (in meters of water column)
  • Δh: Head loss in the suction piping (m)

Note:
If the calculated value of Hg is positive, the pump shaft center is above the inlet water level. If negative, the pump operates under suction lift conditions and special attention must be paid to prevent cavitation.

Operating Parameter Note

Pump flow rate (Q), head (H), and shaft power (N) depend on the actual pump speed. Performance parameters should be corrected accordingly based on real operating RPM.

Pump Head Equation:(2)

GC Series Horizontal Multistage Boiler Feed Pump – Hot Water Type

How to Select a Pump Model 

  • Selection of the pump model should be based on the required flow rate and head. Ensure
  • that the operating conditions match the pump’s design specifications.
  • Consider the medium temperature and the properties of the fluid being pumped.
  • Check the installation site conditions such as elevation, layout, and environment.
  • For critical systems requiring continuous operation, install standby pumps for added reliability.
✔ For detailed pump selection guidance, consult our technical team for assistance.

Engineering Notes

  • Not suitable for liquids containing solids or fibrous materials.
  • Long pipeline systems should include non-return valves and pressure relief devices.
  • Ensure adequate lubrication of bearing assembly during operation.
  • Shaft alignment tolerance must be verified after installation.

Compliance & Quality Assurance

  • Each pump undergoes comprehensive factory hydraulic performance testing.
  • Hydrostatic pressure testing of casing assembly.
  • Rotor dynamic balance inspection.
  • Material traceability documentation is provided.
  • Optional third-party inspection is available.

Safety Notice

  •  Do not operate the pump under dry-running conditions.
  •  Ensure the suction system is properly primed before startup.
  •  Disconnect power before performing maintenance.
  •  Do not exceed rated discharge pressure.

OEM & Customization

  • Chaodun Pump offers OEM and ODM customization for the GC Series pump. Options include stainless steel or cast iron materials, custom labeling, flange configurations, and performance adjustments.
  • Technical adjustments can be made according to system requirements and installation conditions.

FAQs

  • Q: What is the maximum allowable working temperature?
    A: The maximum allowable temperature is 110°C, with higher temperature options available upon request.
  • Q: What is the maximum allowable solid size?
    A: The pump is not suitable for handling solids. Only clean water or non-corrosive liquids should be used.
  • Q: What sealing options are available?
    A: Mechanical seals and packing seals are available, depending on the application requirements.
  • Q: Can the pump operate under variable frequency control?
    A: Yes, the pump can operate under VFD control, as long as the operating conditions remain within the pump’s design specifications.
  • Q: What certifications are available for the pumps?
    A: The pumps are ISO9001 certified, and each unit undergoes extensive testing for performance verification before shipment.
  • Q: Is customization available for the GC series?
    A: Yes, customization options include adjustments to flow rate, head, materials, and other technical parameters to meet specific application needs.