Product Description
Model Code Explanation
Product Overview and Applications
GC horizontal boiler multistage pump is a horizontal single-suction, multistage sectional centrifugal pump mainly used for boiler feed water, hence also known as a horizontal boiler feed multistage pump. This series is suitable for conveying clean water or other non-corrosive liquids with physical and chemical properties similar to water, with temperatures below 110°C. It is widely used for boiler feed applications in industrial and mining enterprises, as well as in urban domestic water supply.
GC horizontal boiler multistage pump can also be widely applied to pressure vessel water supply, hot-water circulation, high-rise building water supply, farmland irrigation, fire-fighting booster systems, hydraulic washing, food processing, brewing, pharmaceuticals, chemicals, aquaculture, environmental protection, chemical process lines and machine-tool auxiliary systems, serving as a power device for water supply and drainage.
Product Features
GC horizontal boiler multistage pump is a multistage sectional type. In models 1-1/2GC to 4GC, the inlet and outlet are located on the suction and discharge sections respectively, both vertically upward. The required head can be adjusted by increasing or decreasing the number of stages.
Pump assembly quality greatly affects performance, especially the alignment between each impeller outlet and the diffuser inlet. The center of each impeller outlet must align precisely with the diffuser center. Even slight misalignment will reduce flow, decrease head and lower efficiency. Therefore, special care must be taken during reassembly after maintenance, and any deviation must be corrected.
The main components of the GC horizontal boiler multistage pump include the shaft, shaft sleeve, suction section, impeller, diffuser, sealing ring, middle section, discharge section, balance ring, balance plate and tail cover.
The suction, middle, discharge sections and tail cover are all made of cast iron, forming the pump’s working chamber.
The impeller is made of cast iron with internal blades. Liquid enters axially from one side. Due to pressure differences on the front and back of the impeller, axial force is generated, which is balanced by the balance plate. Each impeller undergoes static balance testing during manufacturing.
The shaft is made of high-quality carbon steel. The impellers are mounted on the shaft and fixed with keys, shaft sleeves and shaft-sleeve nuts. One end of the shaft is fitted with a coupling assembly to connect directly with the motor. Viewed from the drive end, the pump shaft rotates clockwise.
The sealing ring is made of cast iron and prevents high-pressure water inside the pump from flowing back into the suction section. It is installed in the suction and middle sections. As a wear part, it can be replaced when worn.
The balance ring is made of cast iron and fixed on the discharge section, working together with the balance plate to form the balancing device.
The balance plate is made of wear-resistant cast iron, installed on the shaft between the discharge section and the tail cover to balance axial force.
The shaft sleeve is made of cast iron and located at both stuffing boxes, used to secure the impeller and protect the shaft. It is a wear part and should be replaced when necessary.
The bearing is a single-row deep-groove ball bearing lubricated with calcium-based grease.
The stuffing-box seal consists of stuffing chambers on the suction section and tail cover, packing gland, packing rings and packing material. A small amount of high-pressure water enters the stuffing chamber to form a water seal. Packing tightness must be properly adjusted — neither too tight nor too loose — with leakage controlled to one drop at a time.
If the packing is too tight, the shaft sleeve overheats and power consumption increases. If too loose, excessive leakage reduces pump efficiency.
Structural Diagram
|
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 and Installation Dimensions
|
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
|
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
|
Suction and discharge flange
|
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
|
Explanation of simple calculation
P1: Inlet pressure of the pump (MPa)
P2: Outlet pressure of the pump (MPa)
Z1: Vertical distance from the inlet pressure gauge to the pump shaft center (m)
Z2: Vertical distance from the outlet pressure gauge to the 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: Density of the liquid (kg/m³)
g: Acceleration due to gravity (9.8 m/s²)
Calculation of pump installation height Hg: (Installation height refers to the vertical distance from the pump shaft centerline to the inlet liquid level)
Hg≤P0-[NPSH]-P’-△h-0.5(m)
In the formula:
P0: Atmospheric pressure (or absolute pressure at the inlet liquid surface) (m of water column)
[NPSH]: Net Positive Suction Head of the pump (m)
P’: Vapor pressure of the pumped liquid (m of water column)
Δh: Hydraulic loss in the inlet pipeline (m)
Note: When the calculated value of Hg is positive, it indicates that the pump shaft center is above the inlet liquid level; when it is negative, the pump is in a flooded suction condition.
The values of pump flow rate (Q), head (H), and shaft power (N) depend on the actual pump speed.
Calculate according to the following formulas:
OEM & Custom Solutions
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 for Oversea Buyers
1. What applications is the GC pump best suited for?
Mainly for boiler feed, hot water circulation, and industrial water systems.
2. What is the maximum working temperature?
Up to 110°C under standard design, higher temperature available upon request.
3. Can the pump handle corrosive liquids?
Yes, by customizing materials for impellers and seals.
4. Does Chaodun Pump support OEM or branding service?
Yes, OEM labeling, color customization, and export packaging are supported.
5. How is the pump shipped internationally?
Standard export wooden cases by sea, air, or express.
6. What certifications are available?
ISO9001 certified with full performance testing before delivery.
7. What warranty do you offer?
12-month warranty after shipment, with optional long-term service plan.