Product Description
Model Description
Product Overview & Applications
The D/DG horizontal boiler feed multistage pump is a horizontal, single-suction, multistage sectional centrifugal pump. It adopts advanced hydraulic models and features high efficiency, wide performance range, safe and stable operation, low noise, long service life, and convenient installation and maintenance.
This product is suitable for conveying clean water or other liquids with physical and chemical properties similar to clean water, free of solid particles (abrasives) and suspended substances. By changing the pump material (or materials of the wetted parts), sealing structure, and adding a cooling system, the pump can also convey hot water, oils, corrosive liquids, or media containing abrasives. The allowable inlet pressure is less than 0.6 MPa.
1. Advanced hydraulic model, high efficiency, wide performance range.
2. Smooth operation with low noise.
3. Shaft seal adopts soft packing or mechanical seal; safe, reliable, simple structure, and easy maintenance.
4. Fully enclosed shaft design ensures no contact with the medium, preventing corrosion and extending service life.
For standard applications, the D/DG horizontal boiler feed pump has a horizontal suction inlet and a vertically upward discharge outlet. For oilfield water injection applications, both inlet and outlet are vertically upward. For DG-type pumps, both suction and discharge ports are vertically upward.
The sealing water for the D/DG horizontal boiler feed pump comes from internal pressure water. For D/DG pumps using external water sealing, the sealing water is supplied from an external water source.
The D/DG horizontal multistage pump is a horizontal, single-suction, multistage sectional centrifugal pump. It is suitable for conveying clean water (impurity content less than 1%, particle size less than 0.1 mm) or other liquids with similar properties.
The D/DG horizontal multistage pump is designed for medium temperatures below 80°C and is suitable for mine drainage, oilfield water injection, factory water supply, and municipal water supply and drainage.
For oilfield water injection, different materials are selected according to the corrosiveness of the medium.
The D/DG horizontal multistage centrifugal pump for boiler feed water is suitable for medium temperatures below 105°C and is widely used for various boiler feed applications.
Structure Description
The D/DG horizontal boiler feed multistage pump is mainly composed of four major parts: the stator, rotor, bearings, and shaft seal.
1. The stator assembly consists of the suction section, middle sections, discharge section, and diffusers. The sections are clamped together with tie bolts to form the working chamber.
2. The rotor assembly consists of the shaft, impellers, balance disc, and shaft sleeves. Axial thrust is balanced by the balance disc.
3. The bearing assembly consists of the bearing housing, bearings, and bearing covers. Bearings are lubricated with grease or thin oil.
4. The shaft seal adopts soft packing and consists of the stuffing box on the suction section and tail cover, packing, and water baffle rings.
5. The pump is directly driven by the prime mover through an elastic coupling.
Structural Diagram
|
1
|
Suction Section
|
2
|
Discharge Section
|
3
|
Middle Section
|
4
|
Diffuser
|
5
|
Impeller
|
6
|
Tail Cover
|
7
|
Seal Ring
|
|
8
|
Diffuser Sleeve
|
9
|
Balance Ring
|
10
|
Balance Disc
|
11
|
Packing Ring
|
12
|
Shaft
|
13
|
Shaft Sleeve A
|
14
|
Shaft Sleeve B
|
|
15
|
Left Bearing Assembly
|
16
|
Right Bearing Assembly
|
17
|
Bearing Collar
|
18
|
Tie Bolt
|
19
|
Packing Gland
|
Performance Parameters and Installation Dimensions
|
Model
|
Rotational Speed
|
Flow Rate
|
Head
|
Efficiency
|
Power (kW) |
NPSHr
|
||
|
(r/min)
|
(m3/h)
|
(L/s)
|
(m)
|
(%)
|
Shaft Power
|
Motor Power
|
(m)
|
|
|
DG6-25×3
|
2950
|
6.3
|
1.75
|
75
|
45
|
2.86
|
5.5
|
2
|
|
DG6-25×4
|
2950
|
6.3
|
1.75
|
100
|
45
|
3.81
|
7.5
|
2
|
|
DG6-25×5
|
2950
|
6.3
|
1.75
|
125
|
45
|
4.77
|
7.5
|
2
|
|
DG6-25×6
|
2950
|
6.3
|
1.75
|
150
|
45
|
5.72
|
11
|
2
|
|
DG6-25×7
|
2950
|
6.3
|
1.75
|
175
|
45
|
6.67
|
11
|
2
|
|
DG6-25×8
|
2950
|
6.3
|
1.75
|
200
|
45
|
7.63
|
15
|
2
|
|
DG6-25×9
|
2950
|
6.3
|
1.75
|
225
|
45
|
8.52
|
15
|
2
|
|
DG6-25×10
|
2950
|
6.3
|
1.75
|
250
|
45
|
9.53
|
18.5
|
2
|
|
DG6-25×11
|
2950
|
6.3
|
1.75
|
275
|
45
|
10.5
|
18.5
|
2
|
|
DG6-25×12
|
2950
|
6.3
|
1.75
|
300
|
45
|
11.44
|
18.5
|
2
|
|
Model
|
Rotational Speed
|
Flow Rate
|
Head
|
Efficiency
|
Power (kW)
|
NPSHr
|
||
|
(r/min)
|
(m3/h)
|
(L/s)
|
(m)
|
(%)
|
Shaft Power
|
Motor Power
|
(m)
|
|
|
DG12-25×3
|
2950
|
12.5
|
3.47
|
75
|
54
|
4.73
|
7.5
|
2
|
|
DG12-25×4
|
2950
|
12.5
|
3.47
|
100
|
54
|
6.3
|
11
|
2
|
|
DG12-25×5
|
2950
|
12.5
|
3.47
|
125
|
54
|
7.88
|
11
|
2
|
|
DG12-25×6
|
2950
|
12.5
|
3.47
|
150
|
54
|
9.46
|
15
|
2
|
|
DG12-25×7
|
2950
|
12.5
|
3.47
|
175
|
54
|
11
|
15
|
2
|
|
DG12-25×8
|
2950
|
12.5
|
3.47
|
200
|
54
|
12.51
|
18.5
|
2
|
|
DG12-25×9
|
2950
|
12.5
|
3.47
|
225
|
54
|
14.18
|
18.5
|
2
|
|
DG12-25×10
|
2950
|
12.5
|
3.47
|
250
|
54
|
15.76
|
22
|
2
|
|
DG12-25×11
|
2950
|
12.5
|
3.47
|
275
|
54
|
17.34
|
22
|
2
|
|
DG12-25×12
|
2950
|
12.5
|
3.47
|
300
|
54
|
18.9
|
30
|
2
|
|
Model
|
Rotational Speed
|
Flow Rate
|
Head
|
Efficiency
|
Power (kW)
|
NPSHr
|
||
|
(r/min)
|
(m3/h)
|
(L/s)
|
(m)
|
(%)
|
Shaft Power
|
Motor Power
|
(m)
|
|
|
DG25-30×3
|
2950
|
25
|
6.94
|
90
|
62
|
9.88
|
15
|
2
|
|
DG25-30×4
|
2950
|
25
|
6.94
|
120
|
62
|
13.1
|
18.5
|
2
|
|
DG25-30×5
|
2950
|
25
|
6.94
|
150
|
62
|
16.47
|
22
|
2
|
|
DG25-30×6
|
2950
|
25
|
6.94
|
180
|
62
|
19.77
|
30
|
2
|
|
DG25-30×7
|
2950
|
25
|
6.94
|
210
|
62
|
23.1
|
30
|
2
|
|
DG25-30×8
|
2950
|
25
|
6.94
|
240
|
62
|
26.4
|
37
|
2
|
|
DG25-30×9
|
2950
|
25
|
6.94
|
270
|
62
|
29.65
|
37
|
2
|
|
DG25-30×10
|
2950
|
25
|
6.94
|
300
|
62
|
32.9
|
4.5
|
2
|
|
Model
|
Rotational Speed
|
Flow Rate
|
Head
|
Efficiency
|
Power (kW)
|
NPSHr
|
||
|
(r/min)
|
(m3/h)
|
(L/s)
|
(m)
|
(%)
|
Shaft Power
|
Motor Power
|
(m)
|
|
|
DG46-30×3
|
2950
|
46
|
12.8
|
90
|
70
|
16.11
|
22
|
3
|
|
DG46-30×4
|
2950
|
46
|
12.8
|
120
|
70
|
21.48
|
30
|
3
|
|
DG46-30×5
|
2950
|
46
|
12.8
|
150
|
70
|
26.85
|
37
|
3
|
|
DG46-30×6
|
2950
|
46
|
12.8
|
180
|
70
|
32.21
|
37
|
3
|
|
DG46-30×7
|
2950
|
46
|
12.8
|
210
|
70
|
37.58
|
45
|
3
|
|
DG46-30×8
|
2950
|
46
|
12.8
|
240
|
70
|
42.95
|
55
|
3
|
|
DG46-30×9
|
2950
|
46
|
12.8
|
270
|
70
|
48.32
|
55
|
3
|
|
DG46-30×10
|
2950
|
46
|
12.8
|
300
|
70
|
53.69
|
75
|
3
|
|
Model
|
Rotational Speed
|
Flow Rate
|
Head
|
Efficiency
|
Power (kW)
|
NPSHr | ||
|
(r/min)
|
(m3/h)
|
(L/s)
|
(m)
|
(%)
|
Shaft Power
|
Motor Power |
(m)
|
|
|
DG46-50×3
|
2950
|
46
|
12.8
|
150
|
63
|
29.83
|
37
|
3
|
|
DG46-50×4
|
2950
|
46
|
12.8
|
200
|
63
|
39.77
|
45
|
3
|
|
DG46-50×5
|
2950
|
46
|
12.8
|
250
|
63
|
49.71
|
55
|
2.8
|
|
DG46-50×6
|
2950
|
46
|
12.8
|
300
|
63
|
59.65
|
75
|
2.8
|
|
DG46-50×7
|
2950
|
46
|
12.8
|
350
|
63
|
69.6
|
90
|
2.8
|
|
DG46-50×8
|
2950
|
46
|
12.8
|
400
|
63
|
79.54
|
90
|
2.8
|
|
DG46-50×9
|
2950
|
46
|
12.8
|
450
|
63
|
89.48
|
110
|
2.8
|
|
DG46-50×10
|
2950
|
46
|
12.8
|
500
|
63
|
99.42
|
110
|
2.8
|
|
DG46-50×11
|
2950
|
46
|
12.8
|
550
|
63
|
109.36
|
132
|
2.8
|
|
DG46-50×12
|
2950
|
46
|
12.8
|
600
|
63
|
119.3
|
132
|
2.8
|
Installation Dimensions
| Model |
A
|
B
|
C
|
E
|
F
|
L
|
I
|
M
|
N
|
O
|
H
|
J
|
b
|
K
|
P
|
Q
|
n-φd
|
|
DG6-25×3
|
1175
|
885
|
600
|
145
|
192
|
250
|
180
|
265
|
135
|
210
|
230
|
440
|
170
|
413
|
390
|
390
|
4-φ24
|
|
DG6-25×4
|
1225
|
985
|
650
|
195
|
142
|
250
|
230
|
265
|
135
|
210
|
230
|
400
|
170
|
413
|
390
|
390
|
4-φ24
|
|
DG6-25×5
|
1275
|
985
|
650
|
195
|
192
|
250
|
280
|
265
|
135
|
210
|
230
|
400
|
170
|
413
|
390
|
390
|
4-φ24
|
|
DG6-25×6
|
1450
|
1205
|
785
|
245
|
141
|
250
|
330
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
435
|
435
|
4-φ24
|
|
DG6-25×7
|
1500
|
1205
|
785
|
245
|
191
|
250
|
380
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
435
|
435
|
4-φ24
|
|
DG6-25×8
|
1550
|
1305
|
835
|
295
|
141
|
250
|
430
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
435
|
435
|
4-φ24
|
|
DG6-25×9
|
1600
|
1305
|
835
|
295
|
191
|
250
|
480
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
435
|
435
|
4-φ24
|
|
DG6-25×10
|
1695
|
1500
|
935
|
370
|
91
|
250
|
530
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
435
|
435
|
4-φ24
|
|
DG6-25×11
|
1745
|
1500
|
935
|
370
|
141
|
250
|
580
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
435
|
435
|
4-φ24
|
|
DG6-25×12
|
1795
|
1500
|
935
|
370
|
191
|
250
|
630
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
435
|
435
|
4-φ24
|
|
Model
|
A
|
B
|
C
|
E
|
F
|
L
|
I
|
M
|
N
|
O
|
H
|
J
|
b
|
K
|
P
|
Q
|
n-φd
|
|
DG12-25×3
|
1175
|
874
|
600
|
140
|
180
|
250
|
180
|
265
|
135
|
210
|
230
|
400
|
170
|
413
|
395
|
295
|
4-φ25
|
|
DG12-25×4
|
1350
|
1040
|
710
|
165
|
183
|
250
|
230
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
430
|
430
|
4-φ25
|
|
DG12-25×5
|
1400
|
1090
|
730
|
190
|
183
|
250
|
280
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
430
|
430
|
4-φ25
|
|
DG12-25×6
|
1450
|
1140
|
740
|
232
|
183
|
250
|
330
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
430
|
430
|
4-φ25
|
|
DG12-25×7
|
1500
|
1190
|
780
|
242
|
183
|
250
|
380
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
430
|
430
|
4-φ25
|
|
DG12-25×8
|
1595
|
1284
|
830
|
266
|
183
|
250
|
430
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
430
|
430
|
4-φ25
|
|
DG12-25×9
|
1645
|
1334
|
850
|
294
|
183
|
250
|
840
|
265
|
165
|
255
|
240
|
410
|
170
|
465
|
430
|
430
|
4-φ25
|
|
DG12-25×10
|
1720
|
1397
|
870
|
327
|
172
|
250
|
530
|
265
|
180
|
285
|
260
|
430
|
170
|
510
|
400
|
460
|
4-φ25
|
|
DG12-25×11
|
1770
|
1447
|
900
|
347
|
172
|
250
|
580
|
265
|
180
|
285
|
260
|
430
|
170
|
510
|
400
|
460
|
4-φ25
|
|
DG12-25×12
|
1925
|
1571
|
980
|
371
|
176
|
250
|
633
|
265
|
200
|
310
|
260
|
450
|
170
|
555
|
400
|
500
|
4-φ25
|
|
Model
|
A
|
B
|
C
|
E
|
F
|
L
|
I
|
M
|
N
|
O
|
H
|
J
|
b
|
K
|
P
|
Q
|
n-φd
|
|
DG25-30×3
|
1450
|
1110
|
760
|
185
|
227
|
285
|
230
|
330
|
165
|
255
|
250
|
460
|
210
|
475
|
460
|
460
|
4-φ30
|
|
DG25-30×4
|
1560
|
1219
|
850
|
204
|
228
|
285
|
295
|
330
|
165
|
255
|
250
|
460
|
210
|
475
|
460
|
460
|
4-φ30
|
|
DG25-30×5
|
1650
|
1297
|
880
|
237
|
228
|
285
|
360
|
330
|
180
|
285
|
260
|
470
|
210
|
510
|
460
|
460
|
4-φ30
|
|
DG25-30×6
|
1825
|
1432
|
970
|
262
|
225
|
285
|
425
|
330
|
200
|
310
|
280
|
490
|
210
|
555
|
460
|
505
|
4-φ30
|
|
DG25-30×7
|
1885
|
1497
|
1000
|
297
|
225
|
285
|
490
|
330
|
200
|
310
|
280
|
490
|
210
|
555
|
460
|
505
|
4-φ30
|
|
DG25-30×8
|
1950
|
1562
|
1030
|
332
|
225
|
285
|
555
|
330
|
200
|
310
|
280
|
490
|
210
|
555
|
460
|
505
|
4-φ30
|
|
DG25-30×9
|
2015
|
1627
|
1080
|
347
|
225
|
285
|
620
|
330
|
200
|
310
|
280
|
490
|
210
|
555
|
460
|
505
|
4-φ30
|
|
DG25-30×10
|
2150
|
1728
|
1120
|
398
|
222
|
285
|
685
|
330
|
225
|
345
|
305
|
515
|
210
|
610
|
540
|
460
|
4-φ30
|
|
Model
|
A
|
B
|
C
|
E
|
F
|
L
|
I
|
M
|
N
|
O
|
H
|
J
|
b
|
K
|
P
|
Q
|
n-φd
|
|
DG46-30×3
|
1520
|
1167
|
845
|
130
|
228
|
285
|
230
|
330
|
180
|
285
|
260
|
470
|
210
|
510
|
460
|
460
|
4-φ30
|
|
DG46-30×4
|
1690
|
1302
|
850
|
242
|
225
|
285
|
295
|
330
|
200
|
310
|
280
|
490
|
210
|
555
|
460
|
505
|
4-φ30
|
|
DG46-30×5
|
1755
|
1367
|
910
|
247
|
225
|
285
|
360
|
330
|
200
|
310
|
280
|
490
|
210
|
555
|
460
|
505
|
4-φ30
|
|
DG46-30×6
|
1820
|
1432
|
935
|
287
|
225
|
285
|
425
|
330
|
200
|
310
|
280
|
490
|
210
|
555
|
460
|
505
|
4-φ30
|
|
DG46-30×7
|
1925
|
1532
|
1010
|
302
|
223
|
285
|
490
|
330
|
225
|
345
|
305
|
515
|
210
|
610
|
460
|
545
|
4-φ30
|
|
DG46-30×8
|
2105
|
1694
|
1110
|
349
|
221
|
285
|
555
|
330
|
250
|
385
|
330
|
540
|
210
|
655
|
460
|
594
|
4-φ30
|
|
DG46-30×9
|
2170
|
1759
|
1140
|
384
|
221
|
285
|
620
|
330
|
250
|
385
|
330
|
540
|
210
|
655
|
460
|
594
|
4-φ30
|
|
DG46-30×10
|
2305
|
1897
|
1245
|
402
|
219
|
285
|
685
|
330
|
280
|
410
|
360
|
570
|
210
|
720
|
460
|
650
|
4-φ30
|
|
Model
|
A
|
B
|
C
|
E
|
F
|
L
|
I
|
M
|
N
|
O
|
H
|
J
|
b
|
K
|
P
|
Q
|
n-φd
|
|
DG46-50×3
|
1717
|
1317
|
875
|
215
|
246
|
339
|
245
|
353
|
200
|
310
|
360
|
630
|
300
|
635
|
500
|
500
|
4-φ24
|
|
DG46-50×4
|
1817
|
1415
|
925
|
293
|
246
|
339
|
305
|
353
|
225
|
345
|
420
|
690
|
300
|
725
|
500
|
500
|
4-φ24
|
|
DG46-50×5
|
1992
|
1571
|
1020
|
341
|
240
|
339
|
365
|
353
|
250
|
385
|
420
|
690
|
300
|
745
|
500
|
600
|
4-φ24
|
|
DG46-50×6
|
2122
|
1758
|
1130
|
321
|
180
|
339
|
425
|
353
|
280
|
410
|
420
|
690
|
300
|
780
|
500
|
650
|
6-φ24
|
|
DG46-50×7
|
2182
|
1758
|
1130
|
321
|
240
|
339
|
485
|
353
|
280
|
410
|
420
|
690
|
300
|
780
|
500
|
650
|
6-φ24
|
|
DG46-50×8
|
2292
|
1869
|
1180
|
331
|
240
|
339
|
545
|
353
|
280
|
410
|
420
|
690
|
300
|
780
|
500
|
650
|
6-φ24
|
|
DG46-50×9
|
2473
|
2046
|
1330
|
360
|
166
|
339
|
605
|
353
|
323
|
550
|
515
|
785
|
300
|
970
|
500
|
750
|
6-φ24
|
|
DG46-50×10
|
2533
|
2046
|
1330
|
360
|
226
|
339
|
665
|
353
|
323
|
550
|
515
|
785
|
300
|
970
|
500
|
750
|
6-φ24
|
|
DG46-50×11
|
2641
|
2222
|
1480
|
370
|
166
|
339
|
725
|
353
|
323
|
550
|
515
|
785
|
300
|
970
|
500
|
750
|
6-φ24
|
|
DG46-50×12
|
2701
|
2222
|
1480
|
370
|
226
|
339
|
785
|
353
|
323
|
550
|
515
|
785
|
300
|
970
|
500
|
750
|
6-φ24
|
Suction and Discharge Flanges
 |
Dimensions
|
Suction Flange
|
Discharge Flange
|
||||||
|
Model
|
Dg
|
Do
|
D
|
n-do
|
Dg
|
Do
|
D
|
n-do
|
|
|
D6-25
DG6-25 |
40
|
100
|
130
|
4-φ13.5
|
40
|
110
|
150
|
4-φ17.5
|
|
|
D12-25
DG12-25 |
50
|
110
|
140
|
4-φ13.5
|
40
|
110
|
150
|
4-φ17.5
|
|
|
D25-30
DG25-30 |
65
|
130
|
160
|
4-φ17.5
|
65
|
145
|
185
|
8-φ17.5
|
|
|
D46-30
DG46-30 |
80
|
150
|
190
|
4-φ17.5
|
65
|
145
|
185
|
8-φ17.5
|
|
|
D46-50
DG46-50 |
80
|
150
170 |
190
215 |
4-φ17.5
8-φ22 |
80
|
170
|
215
|
8-φ22
|
|
OEM & Custom Solutions
Customization includes pump materials, shaft seal types, flange standards, voltage/frequency options, OEM branding, color customization, and documentation for international engineering projects.
FAQs for Oversea Buyers
1. What is the delivery time?
Standard models ship in 10–20 days; customized orders require 20–30 days.
2. Can the pump be used for hot water?
Yes, DG models support hot water up to 105°C with appropriate materials.
3. Do you offer OEM customization?
Yes, including nameplate, color, manuals, packaging and performance adjustments.
4. What voltage options are available?
220V, 380V, 415V, 440V, 50/60Hz are fully supported.
5. Is spare parts supply available?
Yes, impellers, shafts, seals and other parts are supplied long-term.
6. What liquids can be pumped?
Clean water or similar liquids; corrosive or abrasive media with material upgrades.
7. Do you provide export documents?
CO, Form-E, Form-F, CIQ, embassy certification, packing list and invoice are available.