Product Description
Model Code Explanation
Product Introduction
The D series horizontal single-suction multistage clean water pump features high efficiency, wide performance range, safe and stable operation, low noise, long service life, and convenient installation and maintenance.
It is designed for conveying clean water or other liquids with physical and chemical properties similar to water. By changing the material of the pump’s flow-passing components, adjusting seal type, and adding a cooling system, the pump can also be used for hot water, oils, corrosive liquids, or liquids containing abrasive particles.
This product complies with JB/T1051-93 “Multistage Clean Water Centrifugal Pump Types and Basic Parameters.”
All D-series pumps are designed and optimized by computer technology. With strong technical capability, extensive manufacturing experience, and comprehensive testing equipment, product quality is stable and reliable.
Product Features
The D series horizontal single-suction multistage centrifugal pump adopts a sectional structure and uses the national recommended high-efficiency hydraulic model. It provides high efficiency, wide performance range, smooth and quiet operation, long service life, and easy maintenance.
It is suitable for conveying clean water free of solid particles (abrasives) or suspended matter, and other similar liquids. By changing the pump material (or flow-passage material), seal type, and adding a cooling system, it can handle hot water, oils, corrosive liquids, or liquids containing abrasive particles.
The allowable inlet pressure of the pump is less than 0.6 MPa.
1. Advanced hydraulic model ensuring high efficiency and wide performance range.
2. Stable pump operation with low noise.
3. Optional soft packing seal or mechanical seal, offering reliable sealing, simple structure, and easy maintenance.
4. Fully enclosed shaft structure ensures no contact with the medium, no corrosion, and long service life.
Product Applications
The D series horizontal single-suction multistage centrifugal pump is mainly used for industrial and municipal water supply and drainage, high-rise building pressure boosting, garden irrigation, fire-fighting boosting, long-distance water transportation, heating systems, bathhouse hot-cold water circulation, and equipment water supply. It is especially suitable for small boiler feed water systems.
Structure Description
The D series pump is multistage and sectional. The suction inlet is positioned horizontally at the suction casing, while the discharge outlet is located vertically upward at the discharge casing. The total pump head can be adjusted by increasing or decreasing the number of stages.
Pump assembly quality strongly affects performance, particularly the alignment between each impeller outlet and the diffuser inlet. Even slight misalignment will reduce flow rate, decrease head, and lower efficiency. Therefore, strict attention is required during maintenance and re-assembly.
Major components of the D series pump include: suction casing, middle casing, discharge casing, impeller, diffuser, diffuser baffle, outlet diffuser, shaft, wear ring, balance ring, shaft sleeve, tail cover, and bearing housing.
• The suction casing, middle casing, diffuser baffle, outlet diffuser, discharge casing, and tail cover are made of cast iron, forming the pump chamber.
• The impeller is high-quality cast iron with internal blades. Liquid enters axially from one side. Due to pressure differences at the front and rear of the impeller, axial thrust is generated and absorbed by the balance disc. Each impeller undergoes static balance testing.
• The shaft is made of high-quality carbon steel, with impellers mounted by keys, shaft sleeves, and shaft sleeve nuts. One end is fitted with a coupling to connect directly to the motor.
• The wear ring (cast iron) prevents high-pressure water from leaking back to the suction chamber. It is installed at the suction casing and middle casing as a wear part and should be replaced when worn.
• The balance ring, installed on the discharge casing, works together with the balance disc as the balancing assembly.
• The balance disc (wear-resistant cast iron) is mounted on the shaft between the discharge casing and the tail cover to balance axial thrust.
• The shaft sleeve (cast iron) is located at the stuffing box to fix the impeller and protect the shaft. It is a wear part and should be replaced when worn.
• Bearings are single-row deep-groove ball bearings, lubricated with calcium-based grease.
• The packing seal prevents air ingress and excessive leakage. It consists of stuffing boxes on the suction casing and tail cover, packing gland, lantern ring, and packing. A small amount of high-pressure water enters the stuffing box for sealing. Packing must be adjusted properly—neither too tight nor too loose. Proper adjustment allows water to drip slightly. Too tight: shaft sleeve overheats and power increases; too loose: efficiency decreases due to leakage.
Structural Diagram
|
1
|
Bearing Cover
|
2
|
Nut
|
3
|
Bearing
|
4
|
Water Deflector Sleeve
|
5
|
Bearing Bracket
|
6
|
Shaft Sleeve (A)
|
7
|
Packing Gland
|
8
|
Lantern Ring
|
|
9
|
Suction Casing
|
10
|
Intermediate Sleeve
|
11
|
Wear Ring
|
12
|
Impeller
|
13
|
Middle Casing
|
14
|
Diffuser Baffle
|
15
|
Diffuser Sleeve
|
16
|
Tension Bolt
|
|
17
|
Outlet Diffuser
|
18
|
Balance Ring
|
19
|
Balance Ring
|
20
|
Balance Disc
|
21
|
Discharge Casing
|
22
|
Tail Cover
|
23
|
Shaft
|
24
|
Shaft Sleeve (B)
|
Performance Parameters
|
Model
|
Stages
|
Flow Rate (Q)
|
Head (m)
|
Speed (r/min)
|
Power (kW)
|
NPSH (m)
|
Efficiency η (%)
|
||
|
m³/h
|
L/s
|
Shaft Power
|
Motor Power
|
||||||
|
50D8×2
|
2
|
18
|
5
|
19
|
2950
|
1.5
|
2.2
|
2.3
|
62
|
|
50D8×3
|
3
|
18
|
5
|
28.5
|
2950
|
2.25
|
3
|
2.3
|
62
|
|
50D8×4
|
4
|
18
|
5
|
38
|
2950
|
3
|
4
|
2.3
|
62
|
|
50D8×5
|
5
|
18
|
5
|
47.5
|
2950
|
3.75
|
5.5
|
2.3
|
62
|
|
50D8×6
|
6
|
18
|
5
|
57
|
2950
|
4.5
|
5.5
|
2.3
|
62
|
|
50D8×7
|
7
|
18
|
5
|
66.5
|
2950
|
5.25
|
7.5
|
2.3
|
62
|
|
50D8×8
|
8
|
18
|
5
|
76
|
2950
|
6
|
7.5
|
2.3
|
62
|
|
50D8×9
|
9
|
18
|
5
|
85.5
|
2950
|
6.75
|
7.5
|
2.3
|
62
|
|
50D8×10
|
10
|
18
|
5
|
95
|
2950
|
7.5
|
11
|
2.3
|
62
|
|
50D8×11
|
11
|
18
|
5
|
104.5
|
2950
|
8.25
|
11
|
2.3
|
62
|
|
50D8×12
|
12
|
18
|
5
|
114
|
2950
|
9
|
11
|
2.3
|
62
|
|
Model
|
Stages
|
Flow Rate (Q)
|
Head (m)
|
Speed (r/min)
|
Power (kW)
|
NPSH (m)
|
Efficiency η (%)
|
||
|
m³/h
|
L/s
|
Shaft Power
|
Motor Power
|
||||||
|
80D12×2
|
2
|
32.4
|
9
|
22.7
|
2950
|
2.68
|
3
|
2.8
|
75
|
|
80D12×3
|
3
|
32.4
|
9
|
34.05
|
2950
|
4.02
|
5.5
|
2.8
|
75
|
|
80D12×4
|
4
|
32.4
|
9
|
45.4
|
2950
|
5.36
|
7.5
|
2.8
|
75
|
|
80D12×5
|
5
|
32.4
|
9
|
56.75
|
2950
|
6.7
|
7.5
|
2.8
|
75
|
|
80D12×6
|
6
|
32.4
|
9
|
68.1
|
2950
|
8.04
|
11
|
2.8
|
75
|
|
80D12×7
|
7
|
32.4
|
9
|
79.45
|
2950
|
9.38
|
11
|
2.8
|
75
|
|
80D12×8
|
8
|
32.4
|
9
|
90.8
|
2950
|
10.72
|
15
|
2.8
|
75
|
|
80D12×9
|
9
|
32.4
|
9
|
102.15
|
2950
|
11.06
|
15
|
2.8
|
75
|
|
80D12×10
|
10
|
32.4
|
9
|
113.5
|
2950
|
13.4
|
15
|
2.8
|
75
|
|
80D12×11
|
11
|
32.4
|
9
|
124.85
|
2950
|
14.74
|
18.5
|
2.8
|
75
|
|
80D12×12
|
12
|
32.4
|
9
|
136.2
|
2950
|
16.08
|
18.5
|
2.8
|
75
|
|
Model
|
Stages
|
Flow Rate (Q)
|
Head (m)
|
Speed (r/min)
|
Power (kW)
|
NPSH (m)
|
Efficiency η (%)
|
||
|
m³/h
|
L/s
|
Shaft Power
|
Motor Power
|
||||||
|
100D16×2
|
2
|
54
|
15
|
35.2
|
2950
|
7.2
|
11
|
3.3
|
71.5
|
|
100D16×3
|
3
|
54
|
15
|
52.8
|
2950
|
10.8
|
15
|
3.3
|
71.5
|
|
100D16×4
|
4
|
54
|
15
|
70.4
|
2950
|
14.4
|
18.5
|
3.3
|
71.5
|
|
100D16×5
|
5
|
54
|
15
|
88
|
2950
|
18
|
22
|
3.3
|
71.5
|
|
100D16×6
|
6
|
54
|
15
|
105.6
|
2950
|
21.6
|
30
|
3.3
|
71.5
|
|
100D16×7
|
7
|
54
|
15
|
123.2
|
2950
|
25.2
|
30
|
3.3
|
71.5
|
|
100D16×8
|
8
|
54
|
15
|
140.8
|
2950
|
28.8
|
37
|
3.3
|
71.5
|
|
100D16×9
|
9
|
54
|
15
|
158.4
|
2950
|
32.4
|
37
|
3.3
|
71.5
|
|
100D16×10
|
10
|
54
|
15
|
176
|
2950
|
36
|
45
|
3.3
|
71.5
|
|
100D16×11
|
11
|
54
|
15
|
198.6
|
2950
|
39.6
|
55
|
3.3
|
71.5
|
|
100D16×12
|
12
|
54
|
15
|
211.2
|
2950
|
43.2
|
55
|
3.3
|
71.5
|
|
Model
|
Stages
|
Flow Rate (Q)
|
Head (m)
|
Speed (r/min)
|
Power (kW)
|
NPSH (m)
|
Efficiency η (%)
|
||
|
m³/h
|
L/s
|
Shaft Power
|
Motor Power
|
||||||
|
125D25×2
|
2
|
108
|
30
|
40
|
2950
|
15.6
|
18.5
|
4
|
76
|
|
125D25×3
|
3
|
108
|
30
|
60
|
2950
|
23.4
|
30
|
4
|
76
|
|
125D25×4
|
4
|
108
|
30
|
80
|
2950
|
31.2
|
37
|
4
|
76
|
|
125D25×5
|
5
|
108
|
30
|
100
|
2950
|
39
|
45
|
4
|
76
|
|
125D25×6
|
6
|
108
|
30
|
120
|
2950
|
46.8
|
55
|
4
|
76
|
|
125D25×7
|
7
|
108
|
30
|
140
|
2950
|
54.6
|
75
|
4
|
76
|
|
125D25×8
|
8
|
108
|
30
|
160
|
2950
|
62.4
|
75
|
4
|
76
|
|
125D25×9
|
9
|
108
|
30
|
180
|
2950
|
70.3
|
90
|
4
|
76
|
|
125D25×10
|
10
|
108
|
30
|
200
|
2950
|
78
|
90
|
4
|
76
|
|
Model
|
Stages
|
Flow Rate (Q)
|
Head (m)
|
Speed (r/min)
|
Power (kW)
|
NPSH (m)
|
Efficiency η (%)
|
||
|
m³/h
|
L/s
|
Shaft Power
|
Motor Power
|
||||||
|
150D30×2
|
2
|
162
|
45
|
54.6
|
2950
|
31.46
|
37
|
4.1
|
76.6
|
|
150D30×3
|
3
|
162
|
45
|
81.9
|
2950
|
47.19
|
55
|
4.1
|
76.6
|
|
150D30×4
|
4
|
162
|
45
|
109.2
|
2950
|
62.92
|
75
|
4.1
|
76.6
|
|
150D30×5
|
5
|
162
|
45
|
136.5
|
2950
|
78.65
|
90
|
4.1
|
76.6
|
|
150D30×6
|
6
|
162
|
45
|
163.8
|
2950
|
94.38
|
110
|
4.1
|
76.6
|
|
150D30×7
|
7
|
162
|
45
|
191.1
|
2950
|
110.11
|
132
|
4.1
|
76.6
|
|
150D30×8
|
8
|
162
|
45
|
218.4
|
2950
|
125.84
|
160
|
4.1
|
76.6
|
|
150D30×9
|
9
|
162
|
45
|
245.7
|
2950
|
141.57
|
160
|
4.1
|
76.6
|
Installation Dimensions
|
Model
|
Number of Stages
|
L
|
L1
|
L2
|
L3
|
L4
|
L5
|
B
|
B1
|
H
|
H1
|
H2
|
H3
|
H4
|
n-φd
|
|
50D8×2
|
2
|
960
|
65
|
490
|
730
|
135
|
345
|
355
|
290
|
230
|
160
|
90
|
100
|
25
|
4-φ20
|
|
50D8×3
|
3
|
1163
|
113
|
550
|
815
|
145
|
390
|
360
|
300
|
240
|
160
|
100
|
145
|
25
|
4-φ20
|
|
50D8×4
|
4
|
1141
|
136
|
580
|
890
|
180
|
410
|
360
|
340
|
242
|
160
|
112
|
153
|
25
|
4-φ20
|
|
50D8×5
|
5
|
1274
|
226
|
710
|
1120
|
270
|
485
|
370
|
370
|
242
|
160
|
132
|
183
|
25
|
4-φ20
|
|
50D8×6
|
6
|
1332
|
226
|
710
|
1120
|
270
|
485
|
370
|
370
|
242
|
160
|
132
|
183
|
25
|
4-φ20
|
|
50D8×7
|
7
|
1390
|
226
|
710
|
1120
|
270
|
485
|
370
|
370
|
242
|
160
|
132
|
183
|
25
|
4-φ20
|
|
50D8×8
|
8
|
1448
|
310
|
770
|
1230
|
300
|
485
|
370
|
370
|
242
|
160
|
132
|
183
|
25
|
4-φ20
|
|
50D8×9
|
9
|
1508
|
310
|
770
|
1230
|
300
|
485
|
370
|
370
|
242
|
160
|
132
|
183
|
25
|
4-φ20
|
|
50D8×10
|
10
|
1689
|
362
|
949
|
1515
|
420
|
610
|
370
|
405
|
255
|
160
|
160
|
225
|
25
|
4-φ20
|
|
50D8×11
|
11
|
1747
|
362
|
940
|
1515
|
420
|
610
|
370
|
405
|
255
|
160
|
160
|
225
|
25
|
4-φ20
|
|
50D8×12
|
12
|
1805
|
362
|
940
|
1515
|
420
|
610
|
370
|
405
|
255
|
160
|
160
|
225
|
25
|
4-φ20
|
|
Model
|
Number of Stages
|
L
|
L1
|
L2
|
L3
|
L4
|
L5
|
B
|
B1
|
H
|
H1
|
H2
|
H3
|
H4
|
n-φd
|
|
80D12×2
|
2
|
1139
|
121
|
610
|
860
|
130
|
390
|
410
|
300
|
245
|
210
|
100
|
145
|
25
|
4-φ20
|
|
80D12×3
|
3
|
1304
|
232
|
770
|
1130
|
235
|
485
|
410
|
365
|
247
|
210
|
132
|
183
|
25
|
4-φ20
|
|
80D12×4
|
4
|
1374
|
232
|
770
|
1130
|
235
|
485
|
410
|
365
|
247
|
210
|
132
|
183
|
25
|
4-φ20
|
|
80D12×5
|
5
|
1444
|
232
|
770
|
1130
|
235
|
485
|
410
|
365
|
247
|
210
|
132
|
183
|
25
|
4-φ20
|
|
80D12×6
|
6
|
1639
|
273
|
990
|
1385
|
230
|
610
|
410
|
410
|
260
|
210
|
160
|
225
|
25
|
4-φ20
|
|
80D12×7
|
7
|
1709
|
273
|
990
|
3185
|
230
|
610
|
410
|
410
|
260
|
210
|
160
|
225
|
25
|
4-φ20
|
|
80D12×8
|
8
|
1779
|
403
|
1020
|
1600
|
415
|
610
|
410
|
410
|
260
|
210
|
160
|
225
|
25
|
4-φ20
|
|
80D12×9
|
9
|
1849
|
403
|
1020
|
1600
|
415
|
610
|
410
|
410
|
260
|
210
|
160
|
225
|
25
|
4-φ20
|
|
80D12×10
|
10
|
1919
|
403
|
1020
|
1600
|
415
|
610
|
410
|
410
|
260
|
210
|
160
|
225
|
25
|
4-φ20
|
|
80D12×11
|
11
|
2034
|
471
|
1110
|
1775
|
480
|
655
|
410
|
410
|
260
|
210
|
160
|
225
|
25
|
4-φ20
|
|
80D12×12
|
2104
|
471
|
1110
|
1775
|
480
|
655
|
410
|
410
|
260
|
210
|
160
|
225
|
25
|
4-φ20
|
|
|
Model
|
Number of Stages
|
L
|
L1
|
L2
|
L3
|
L4
|
L5
|
B
|
B1
|
H
|
H1
|
H2
|
H3
|
H4
|
n-φd
|
|
100D16×2
|
2
|
1395
|
131
|
785
|
1175
|
225
|
615
|
450
|
450
|
280
|
220
|
160
|
225
|
30
|
4-φ20
|
|
100D16×3
|
3
|
1475
|
131
|
785
|
1175
|
225
|
615
|
450
|
450
|
280
|
220
|
160
|
225
|
30
|
4-φ20
|
|
100D16×4
|
4
|
1600
|
191
|
865
|
1300
|
245
|
660
|
450
|
450
|
280
|
220
|
160
|
225
|
30
|
4-φ20
|
|
100D16×5
|
5
|
1705
|
231
|
910
|
1380
|
285
|
695
|
450
|
450
|
300
|
220
|
180
|
250
|
30
|
4-φ20
|
|
100D16×6
|
6
|
1890
|
292
|
1015
|
1620
|
385
|
790
|
485
|
485
|
310
|
220
|
200
|
275
|
35
|
4-φ20
|
|
100D16×7
|
7
|
1970
|
292
|
1015
|
1620
|
385
|
790
|
485
|
485
|
310
|
220
|
200
|
275
|
35
|
4-φ20
|
|
100D16×8
|
8
|
2050
|
372
|
1095
|
1780
|
465
|
790
|
485
|
485
|
310
|
220
|
200
|
275
|
35
|
4-φ20
|
|
100D16×9
|
9
|
2130
|
372
|
1095
|
1780
|
465
|
790
|
485
|
485
|
310
|
220
|
200
|
275
|
35
|
4-φ20
|
|
100D16×10
|
10
|
2250
|
433
|
1175
|
1885
|
485
|
830
|
450
|
515
|
335
|
220
|
225
|
305
|
35
|
4-φ20
|
|
100D16×11
|
11
|
2445
|
491
|
1325
|
2150
|
590
|
945
|
455
|
580
|
360
|
220
|
250
|
325
|
35
|
4-φ20
|
|
100D16×12
|
12
|
2525
|
491
|
1325
|
2150
|
590
|
945
|
455
|
580
|
360
|
220
|
250
|
325
|
35
|
4-φ20
|
|
Model
|
Number of Stages
|
L
|
L1
|
L2
|
L3
|
L4
|
L5
|
B
|
B1
|
H
|
H1
|
H2
|
H3
|
H4
|
n-φd
|
|
125D25×2
|
2
|
1619
|
151
|
855
|
1230
|
185
|
660
|
530
|
420
|
330
|
270
|
160
|
225
|
40
|
4-φ24
|
|
125D25×3
|
3
|
1849
|
225.5
|
980
|
1510
|
310
|
790
|
530
|
485
|
330
|
270
|
200
|
275
|
40
|
4-φ24
|
|
125D25×4
|
4
|
1949
|
225.5
|
980
|
1510
|
310
|
790
|
530
|
485
|
330
|
270
|
200
|
275
|
40
|
4-φ24
|
|
125D25×5
|
5
|
2089
|
300
|
1075
|
1635
|
335
|
830
|
540
|
540
|
345
|
270
|
225
|
305
|
40
|
4-φ24
|
|
125D25×6
|
6
|
2304
|
351.5
|
1190
|
1835
|
385
|
945
|
540
|
590
|
370
|
270
|
250
|
325
|
40
|
4-φ24
|
|
125D25×7
|
7
|
2486
|
627
|
1510
|
2115
|
310
|
1018
|
540
|
640
|
400
|
270
|
280
|
360
|
40
|
4-φ24
|
|
125D25×8
|
8
|
2586
|
627
|
1510
|
2115
|
310
|
1018
|
540
|
640
|
400
|
270
|
280
|
360
|
40
|
4-φ24
|
|
125D25×9
|
9
|
2736
|
779
|
1680
|
2370
|
360
|
1068
|
540
|
640
|
400
|
270
|
280
|
360
|
40
|
4-φ24
|
|
125D25×10
|
10
|
2836
|
779
|
1680
|
2370
|
360
|
1068
|
540
|
640
|
400
|
270
|
280
|
360
|
40
|
4-φ24
|
|
Model
|
Number of Stages
|
L
|
L1
|
L2
|
L3
|
L4
|
L5
|
B
|
B1
|
H
|
H1
|
H2
|
H3
|
H4
|
n-φd
|
|
150D30×2
|
2
|
1859
|
193
|
975
|
1410
|
205
|
793
|
600
|
500
|
380
|
320
|
200
|
275
|
45
|
4-φ24
|
|
150D30×3
|
3
|
2129
|
249
|
1120
|
1650
|
265
|
948
|
600
|
600
|
380
|
320
|
250
|
325
|
45
|
4-φ24
|
|
150D30×4
|
4
|
2314
|
306
|
1210
|
1835
|
325
|
1018
|
600
|
650
|
390
|
320
|
280
|
360
|
45
|
4-φ24
|
|
150D30×5
|
5
|
2479
|
365
|
1290
|
2000
|
380
|
1068
|
600
|
650
|
400
|
320
|
280
|
360
|
45
|
4-φ24
|
|
150D30×6
|
6
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
|
150D30×7
|
7
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
|
150D30×8
|
8
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
|
150D30×9
|
9
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
Inlet & Outlet Flanges
|
Dimensions
|
Suction Flange
|
Discharge Flange | ||||||
|
Model
|
Dg
|
Do
|
D
|
n-do
|
Dg
|
Do
|
D
|
n-do
|
|
50D8
|
75
|
150
|
185
|
4-φ18
|
50
|
125
|
160
|
4-φ18
|
|
80D12
|
80
|
150
|
185
|
4-φ18
|
80
|
160
|
195
|
4-φ18
|
|
100D16
|
100
|
170
|
205
|
4-φ18
|
100
|
180
|
215
|
8-φ18
|
|
125D25
|
125
|
200
|
235
|
8-φ18
|
125
|
210
|
245
|
8-φ18
|
|
150D30
|
150
|
225
|
260
|
8-φ18
|
150
|
240
|
280
|
8-φ18
|
Simple Calculation Description
Calculation of pump head H:
In the formula:
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 measuring point (m/s)
V2: flow velocity at the outlet pressure measuring point (m/s)
ρ: liquid density (kg/m3)
g: gravitational acceleration (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 level), (m water column)
[NPSH]: required NPSH of the pump (m)
P’: vapor pressure of the pumped liquid (m water column)
△h: hydraulic loss in the inlet pipeline (m)
Note: when the calculated value of Hg is positive, it means that the pump shaft center is above the inlet liquid level; when the calculated value is negative, it means the pump is in a flooded suction condition.
The values of pump flow rate (Q), head (H) and shaft power (N) are related to the actual pump speed.
Calculated according to the following formulas:
Installation, Start-up and Operation
(I) Installation:
1. Preparations before installation.
(1) Check the pump and motor.
(2) Prepare tools and lifting equipment.
(3) Check the foundation of the unit.
2. Installation procedure:
(1) When the complete pump set is delivered to the site with the baseplate and the motor already mounted and leveled on the baseplate, the pump and motor do not need to be removed.
(2) Place the baseplate on the foundation, insert wedge-shaped shims near the foundation bolts and raise the baseplate by about 20–40 mm to allow for grouting after leveling.
(3) Check the levelness of the baseplate with a level gauge; after leveling, tighten the foundation nuts and grout under the baseplate with cement mortar.
(4) After the cement has cured for 3–4 days, check the levelness again.
(5) Clean off any dirt from the supporting surfaces of the baseplate, the pump feet and the motor feet, then place the pump and motor on the baseplate.
(6) Adjust the pump shaft to be level. After leveling, tighten the nuts appropriately to prevent movement. After the adjustment is completed, install the motor. Where the level is not correct, insert steel shims, and leave an appropriate clearance between the pump and the coupling.
(7) Place a straightedge on the coupling to check whether the pump shaft centerline coincides with the motor shaft centerline. If not, insert thin shims under the motor or pump feet so that the two coupling faces are flush with the straightedge. Then remove the several thin shims and replace them with a machined solid steel plate, and recheck the installation condition.
To check installation accuracy, use a feeler gauge at several opposite positions around the coupling faces to measure the gap. The difference between the maximum and minimum gap around the coupling faces shall not exceed 0.3 mm, and the difference between the centerlines at the two ends (up/down or left/right) shall not exceed 0.1 mm.
(II) Start-up and shutdown:
(1) Wipe off the oil applied on the shaft and other lubricated parts.
(2) Clean the bearings and oil chamber with gasoline and wipe dry with cotton yarn.
(3) Fill the bearing housing with calcium-based grease.
(4) After the test run is successful, check whether the motor rotation direction is correct. Carefully prevent reverse rotation of the pump which may loosen the nuts, then start the motor.
(5) Fill the pump with water or prime the pump.
(6) Close the valve and pressure gauge cock on the discharge pipe.
(7) After the above steps are completed, start the motor and open the pressure gauge cock.
(8) When the pump is running at the normal speed and the pressure gauge shows the appropriate pressure, open the vacuum gauge cock and gradually open the gate valve on the discharge pipeline until the required pressure is reached.
(9) When stopping the pump, slowly close the gate valve on the discharge pipeline, close the vacuum gauge cock, then stop the motor, and finally close the pressure gauge cock.
(10) When the pump is out of service for a long period, it should be disassembled, the water on the pump parts wiped off, and an anti-rust oil applied to the sliding surfaces for proper storage.
(III) Operation:
(1) Pay attention to the pump bearing temperature. It shall not exceed the ambient temperature by more than 35 °C, and the maximum temperature shall not be greater than 75 °C.
(2) The normal leakage in the stuffing box should not exceed about 15 ml per minute. The tightness of the packing gland should be adjusted at any time.
(3) Periodically check the coupling and pay attention to the motor bearing temperature rise.
(4) During operation, if noise or abnormal sounds occur, stop the pump immediately and check the cause.
OEM & Custom Solutions
We offer OEM/ODM customization for materials (cast iron, stainless steel, duplex steel), motor voltage (220V/415V/460V), and installation configuration. Explosion-proof motors, control panels, and base-mounted assemblies are available. All products are tested to ISO9001 and CE standards, ensuring high performance and reliability for export projects.
FAQs for Oversea Buyers
Q: What is the main application of the D series pump?
A: It is widely used for industrial and municipal water supply, boiler feed, and pressure boosting for clean water systems.
Q: What’s the maximum temperature of the liquid?
A: The D pump can handle liquids up to 80°C; special versions can operate up to 120°C.
Q: Can it be used for slightly corrosive liquids?
A: Yes, with stainless steel wetted parts or optional mechanical seals for specific fluids.
Q: What is the maximum head?
A: Depending on the model and stage number, the pump head can reach up to 232 meters.
Q: What are the maintenance requirements?
A: Regular lubrication and seal inspection; no complex maintenance procedures are required.
Q: Do you support OEM voltage customization?
A: Yes, we provide custom voltages and control systems for export markets.
Q: Which countries import this pump?
A: The D series is exported to Southeast Asia, Africa, and South America for industrial and municipal water projects.