GC Series Horizontal Multistage Boiler Feed Pump – Hot Water Type

GC Series Horizontal Multistage Boiler Feed Pump – Hot Water Type

GC Horizontal Multistage Boiler Feed Pump (Hot Water Type) | Segmental multistage design for high-pressure feedwater duty

  • Boiler feed / hot-water duty: For boiler make-up and hot-water circulation.
  • Segmental multistage design: Stages configured to match system pressure.
  • Axial-thrust balancing: Balance ring + balance disc to reduce axial load.
  • Service-friendly build: Replaceable wear parts; easy maintenance.
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Product Overview

The GC horizontal boiler multistage pump is a horizontal, single-suction, segmented multistage centrifugal pump, specifically designed for continuous operation in boiler feedwater and make-up water systems. It features a sectional multistage configuration, allowing head adjustment by changing the number of stages. All critical wetted components, shaft assemblies, sealing structures, and axial thrust balancing devices are optimized to ensure stable water supply, high operational reliability, and easy maintenance.

Model Designation

GC Series Horizontal Multistage Boiler Feed Pump – Hot Water Type

Key Features

  • Multistage sectional structure; for 1½GC to 4GC models, suction and discharge ports are vertically upward, ensuring compact layout and easy installation.

  • Pump head can be adjusted by adding or removing stages, enabling flexible adaptation to various system conditions.

  • Accurate coaxial alignment between impeller outlets and diffuser inlets is essential; improper assembly may reduce efficiency—special care must be taken during maintenance and reassembly.

  • Modular structure facilitates inspection and maintenance; ideal for boiler applications requiring stable continuous operation and scheduled servicing.

Engineering Summary

The GC pump is a horizontal, single-suction, segmented multistage centrifugal pump. The impellers are made of cast iron and statically balanced for smooth rotation. Liquid enters from one side and gains energy through impeller motion. Axial thrust, generated due to pressure difference between impeller sides, is absorbed by a balancing disc assembly.
The shaft is made of high-quality carbon steel; impellers are secured with keys, sleeves, and locking nuts. The shaft end is coupled directly to the motor. Viewed from the drive end, shaft rotation is clockwise.
Seal rings, made of cast iron, are installed at the suction and middle sections to prevent backflow. Axial thrust is balanced by a cast iron balancing disc located between the discharge section and rear cover.
Shaft sleeves are positioned in the stuffing box area to protect the shaft from wear and can be replaced when worn. Bearings are single-row deep groove ball bearings, lubricated with calcium-based grease.

Typical Applications

The GC series is widely used in:

  • Industrial and mining boiler feedwater systems

  • Municipal boiler-based water supply networks

  • Pressure vessel water supply and hot water circulation systems

  • High-rise building water supply and agricultural irrigation

  • Firefighting booster systems and hydraulic cleaning equipment

  • Food processing, pharmaceuticals, chemical plants, aquaculture, environmental projects, and machine tool cooling systems

It is suitable for clean water or non-corrosive liquids with physical and chemical properties similar to water. Maximum allowable medium temperature is 110°C, making it a reliable power unit for continuous water supply and liquid transfer applications.

System & Operation

Components & Supply

  • Main components include shaft, shaft sleeve, suction chamber, impellers, diffusers, seal rings, intermediate section, discharge section, balancing ring, balancing disc, and rear cover.

  • The pump casing consists of cast iron suction, intermediate, discharge, and rear sections forming the complete hydraulic chamber.

  • Impellers feature internal flow channels and are dynamically balanced; energy is imparted via rotation.

  • Seal rings and shaft sleeves are wear parts and replaceable; bearings are deep groove ball bearings, lubricated with calcium grease.

Technical Specifications

Operating Conditions

  • Suitable for clean water or non-corrosive liquids with physical and chemical properties similar to water; kinematic viscosity ≤150 mm²/s.

  • Maximum medium temperature: 110°C.

  • Operating pressure depends on stage count and system conditions; ensure operation within design limits.

  • Rotation direction: Clockwise when viewed from the motor side.

Service Conditions

  • Installation sites should be well-ventilated, free from explosive gases or aggressive media.

  • Indoor installation is recommended; for outdoor setups, appropriate protective measures must be taken.

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

  • The foundation must be stable to prevent vibration and ensure long-term performance.

Protection Functions

  • Motors should be equipped with thermal overload protection to prevent damage under abnormal conditions.

  • A check valve is recommended to prevent reverse flow and water hammer during shutdown.

  • Safety relief devices must be installed for high-temperature or high-pressure systems.

  • Optional pressure/flow interlocks can be configured to prevent dry running or off-design operation.

Selection Criteria

  • Select pump model and number of stages based on required head and flow rate, ensuring the duty point falls within the high-efficiency region.

  • Confirm medium temperature and characteristics; use standard configuration for clean water or request custom materials for special media.

  • Consider site conditions, including installation height, layout, and environment, to determine pump form, nozzle orientation, and motor specifications.

  • For systems requiring continuous operation, install standby or redundant pumps for reliability and maintenance.

  • Account for service intervals and component standardization to simplify inspection and reduce downtime.

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

OEM & Custom

Chaodun Pump provides OEM and ODM customization for GC horizontal multistage pumps. Available in stainless steel or cast iron materials with custom labeling, flange options, and performance configurations. Suitable for distributors and system integrators worldwide.

FAQs

  1. 1. What are the ideal applications for the GC pump?
    Primarily used for boiler feed, hot water circulation, and industrial water systems.
  2. 2. What is the maximum working temperature?
    The standard design supports a maximum working temperature of 110°C, with higher temperatures available upon request.
  3. 3. Can the pump handle corrosive liquids?
    Yes, it can handle corrosive liquids by customizing the impeller and seal materials for enhanced resistance.
  4. 4. Does Chaodun Pump offer OEM or branding services?
    Yes, we offer OEM labeling, color customization, and export packaging services.
  5. 5. What certifications are available for the pumps?
    Our pumps are ISO9001 certified, and each unit undergoes comprehensive performance testing before shipment to ensure quality and reliability.
  6. 6. Are Chaodun Pump products customizable?
    Yes, we offer flexible customization options, including flow rate, head, and other technical parameters, to meet various application requirements.
  7. 7. What after-sales services does Chaodun Pump provide?
    We provide full after-sales support, including installation guidance, maintenance services, and spare parts replacement to ensure long-term reliable operation.