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 PumpTYPE 4

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 PumpTYPEjiegoutu

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 PumpTYPEanzhuangjpg 2

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 PumpTYPEfalan 2

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 PumpTYPEjisuan 1

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 PumpTYPEjisuanone 1

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.