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Product Center
Horizontal multistage pump type D
Flow: 3.7-1350m³/h
Lifting height: 49-1800m
Power: 3-1120kw
Efficiency: 32%-84%
Pump weight: 78-3750kg
Cavitation margin: 2.0-7.0m
Price: 0.58-9.78 ten thousand
To supply and transport clean water or other liquids with physical-chemical properties similar to water, the liquid temperature must not exceed 80℃. It features high efficiency, a wide performance range, safe and stable operation, low noise, long service life, and easy installation and maintenance.
Product description
The horizontal multistage centrifugal pump type D is a segmented multistage centrifugal pump with a single suction, designed to transport clean water or other liquids with similar physical-chemical properties to water, with a maximum liquid temperature that should not exceed 80°C. It features high efficiency, a wide performance range, safe and stable operation, low noise level, long service life, and easy installation and maintenance. It can also be used to transport hot water, oils, corrosive media, or abrasive particles by changing the materials of the fluid passage parts, the type of sealing, and adding a cooling system. The product complies with the JB/T1051-93 standard "Type and basic parameters of multistage centrifugal pumps for clean water."
The horizontal multistage pump type D is mainly used in the supply and drainage of industrial and urban water, pressure boosting in high-rise buildings, garden irrigation, pressure boosting for fire protection systems, long-distance water transport, heating, and circulation of cold and hot water in bathrooms and auxiliary equipment, being especially suitable for water supply in small boilers.
The multistage pump manufacturer Changsha Zhonglian Pump Industry designs and optimizes all its multistage pumps using computers. The company has a strong technical capability, extensive production experience, and complete inspection methods to ensure the stability and reliability of product quality.
Features of the horizontal multistage centrifugal pump type D
1. Advanced hydraulic model, high efficiency, and wide performance range.
2. Stable operation of the pump and low noise level.
3. The shaft seal uses soft packing or mechanical seal, with safe and reliable sealing, simple structure, and easy and quick maintenance.
4. The shaft has a completely sealed structure that ensures it does not come into contact with the medium, preventing corrosion and prolonging service life.
Structural diagram of the horizontal multistage centrifugal pump type D
Description of the structure of the horizontal multistage centrifugal pump type D
The horizontal multistage pump type D is segmented into multiple stages, with the water inlet located in the horizontal direction at the inlet section, and the outlet in the vertical direction upwards at the water section. The lift height can be adjusted by increasing or decreasing the number of stages as needed. The correct assembly of the pump significantly affects its performance, especially the alignment between the outlet of each impeller and the center of the inlet and outlet of the guide vanes; any deviation can reduce the flow rate, decrease the lift height, and efficiency, so special attention should be paid during maintenance and assembly.
The main parts of the horizontal multistage pump type D are: inlet section, middle section, outlet section, impeller, guide vanes, outlet guide vanes, shaft, sealing ring, balance ring, shaft sleeve, rear cover, and bearing body.
The inlet section, middle section, guide vanes, outlet guide vanes, outlet section, and rear cover are made of cast iron, collectively forming the working chamber of the pump.
The impeller of the horizontal centrifugal pump type D is made of high-quality cast iron, with internal blades. The liquid enters axially from one side of the shaft. Due to the pressure difference between the front and rear of the impeller, there is an axial force that is supported by the balance disc. The impeller undergoes a static balance test during its manufacturing.
The shaft is made of high-quality carbon steel, with the impeller mounted in the middle, fixed to the shaft by keys, sleeves, and nut sleeves. One end of the shaft is equipped with a coupling for direct connection to the motor.
The sealing ring of the horizontal centrifugal pump type D is made of cast iron to prevent high-pressure water from returning to the inlet part. It is fixed in the inlet section and the middle section. It is a wear part that can be replaced with spare parts when worn.
The balance ring is made of cast iron and is fixed in the outlet section, forming a balance device together with the balance.
The balance disc of the horizontal centrifugal pump type D is made of wear-resistant cast iron, mounted on the shaft between the outlet section and the rear cover to balance the axial force.
The shaft sleeve is made of cast iron, located in the packing chamber, serves to fix the impeller and protect the pump shaft. It is a wear part that can be replaced with spare parts when worn.
The bearing is a single-row radial ball bearing, lubricated with calcium-based grease.
The packing has a sealing function to prevent air entry and liquid leakage. The packing seal consists of the packing chamber in the inlet section and the rear cover, the packing gland, the packing ring, and the packing itself. A small flow of high-pressure water enters the packing chamber to form a water seal. The tension of the packing must be appropriate, neither too tight nor too loose, allowing the liquid to leak drop by drop. If it is too tight, the shaft sleeve will heat up and consume more power. If it is too loose, the liquid loss will reduce the efficiency of the pump.
Assembly, start-up, operation, and stopping of the horizontal multistage centrifugal pump type D
(1) Assembly sequence:
1) Firmly place the sealing rings in the inlet section and in the guide vanes.
2) Mount the guide vanes in the middle section, then place the guide vanes in all the middle sections.
3) Pass the shafts with sleeves A and B through the inlet section and push the impeller, place a layer of paper between the middle sections, mount the middle section, then push the second impeller and repeat the previous steps until all the impellers and middle sections are mounted.
4) Mount the balance ring, balance sleeve, and outlet guide vanes in the outlet section.
5) Mount the outlet section to the middle section and tighten the bolts to fix the inlet section, middle section, and outlet section together.
6) Mount the balance disc and sleeve B (the 50DB pump does not have this part).
7) Place the paper layer on the rear cover, mount the rear cover on the outlet section, and then mount the packing, the packing ring, and the stuffing box in the packing chamber of the inlet section and the rear cover in order.
8) Mount the bearing body in the inlet section and the rear cover, and tighten with bolts.
9) Insert the bearing positioning sleeve, the ball bearing, and secure with the nut.
10) Apply an appropriate amount of grease to the bearing body, place the paper layer on the bearing cover, mount the bearing cover on the bearing body, and tighten with screws.
11) Mount the coupling, the air vent, and all square plugs.
Disassembly is performed in the reverse order of assembly.
(2) Installation:
1. Preparations before installation.
1) Check the water pump and the motor.
2) Prepare tools and lifting machinery.
3) Inspect the machine base.
2. Installation sequence:
1) Transport the complete pump assembly to the site; if it comes with a base and installed motor, it is not necessary to disassemble the pump and motor to level the base.
2) Place the base on the foundation, place wedges near the anchor bolts to raise the base approximately 20 to 40 millimeters, preparing to level and fill with cement grout.
3) Use a level to check the horizontal position of the base, level and tighten the nuts of the anchor bolts, fill the base with cement grout.
4) After 3 to 4 days of cement drying, check the horizontal position again.
5) Clean the dirt from the support surface of the base, the legs of the pump, and the motor; then place the pump and motor on the base.
6) Adjust the horizontal position of the pump shaft, level and properly tighten the nuts to prevent movement; after adjustment, install the motor; place iron plates where it is not level; leave a gap between the pump and the coupling.
7) Place a level rule over the coupling to check if the pump shaft and the motor shaft are aligned; if they are not aligned, place thin sheets under the legs of the motor or the pump to level the outer circle of both couplings with the rule, then replace the sheets with a machined iron plate and check the installation again.
To verify the accuracy of the installation, use gauges in various opposite positions to measure the gap between the surfaces of the couplings; the maximum and minimum difference around the coupling should not exceed 0.3 mm, and the difference in the center in vertical or horizontal direction should not exceed 0.1 mm.
(3) Start and stop:
1) Clean the old oil from the shafts and other lubricated parts.
2) Clean the bearings and the oil chamber with gasoline, and dry with cotton.
3) Add calcium-based oil to the bearing body.
4) After a successful test, check that the motor's rotation direction is correct; avoid the pump rotating in the opposite direction and loosen the nuts; then start the motor.
5) Fill the pump with water or prime the pump in empty.
6) Close the valve and the pressure gauge plug in the discharge pipe.
7) After completing the above, start the motor and open the pressure gauge plug.
8) When the pump operates at normal speed, the pressure gauge will show the appropriate pressure; then open the vacuum gauge and gradually open the gate valve in the drainage pipe until the required pressure is reached.
9) When stopping the pump, slowly close the gate valve in the drainage pipe, close the vacuum gauge plug, stop the motor, and then close the pressure gauge plug.
10) When the pump is out of service for a long time, disassemble it, clean the water from the parts, and apply anti-corrosive oil to the sliding surfaces for proper storage.
(4) Operation:
1) Pay attention to the temperature of the pump bearing; it should not exceed the ambient temperature by 35 degrees or exceed 75 degrees.
2) The normal water leakage in the packing chamber should not exceed 15 milliliters per minute; adjust the packing pressure as necessary.
3) Periodically inspect the coupling and pay attention to the increase in temperature of the motor bearing.
4) During operation, if noise or abnormal sounds are detected, stop immediately and check the cause.
Product parameters
Technical parameters of the horizontal multistage centrifugal pump type D
| Flow: 3.7-1350m³/h | Manometric height: 49-1800m | Power: 3-1120KW |
| Speed: 1450-2950r/min | Nominal diameter: φ50-φ200 | Temperature range: ≤105℃ |
Performance curve of the horizontal multistage centrifugal pump type D
Meaning of the model of the horizontal multistage centrifugal pump type D
Performance parameters of the horizontal multistage centrifugal pump type D
| Model Series |
Flow range (m³/h) |
Manometric height range (m) |
Efficiency range (%) |
Compatible power range (kw) |
| D6-25 | 3.75~7.5 | 70.35~320.3 | 36~49.5 | 5.5~18.5 |
| D6-50 | 3.75~7.5 | 144~624 | 28~30 | 15~55 |
| D6-80 | 3.75~7.5 | 225~982 | 32~36 | 15~75 |
| D12-25 | 7.5~15 | 68.3~325.3 | 43.3~52.1 | 7.5~30 |
| D12-50 | 7.5~15 | 142.7~635 | 30.6~44.6 | 18.5~75 |
| D12-80 | 7.5~15 | 225~982 | 37~40 | 30~132 |
| D25-30 | 15~30 | 77.7~418.8 | 55.2~56.9 | 15~55 |
| D25-50 | 15~30 | 144~618 | 44~54 | 22~110 |
| D25-80 | 15~30 | 228~1013 | 47~56 | 37~160 |
| D46-30 | 30~55 | 76.2~429 | 60~66.8 | 22~90 |
| D46-50 | 30~55 | 138.3~658.8 | 53.6~64.5 | 37~160 |
| D46-80 | 30~55 | 228~1056 | 59~65 | 55~250 |
| 80D12 | 21.6~39.6 | 19~129.6 | 69~75 | 4~18.5 |
| D65-80 | 50~75 | 228~1056 | 60~67 | 75~315 |
| 100D16 | 37.6~72 | 20.4~178.2 | 66~73 | 7.5~37 |
| D85-45 | 55~100 | 121.8~612 | 64.2~70.4 | 55~200 |
| D85-67 | 55~100 | 186.9~888 | 56.1~68.4 | 90~315 |
| D85-80 | 55~100 | 228~1056 | 59~71 | 110~450 |
| D85-150 | 55~100 | 429~1872 | 53~60 | 220~900 |
| D100-25 | 72~119 | 46~270 | 63.4~69 | 30~132 |
| D100-55 | 85~120 | 147~708 | 64.4~68 | 90~315 |
| D120-50 | 96~140 | 126.9~654 | 72~78 | 90~280 |
| D120-67 | 96~140 | 183~840 | 62~71 | 110~450 |
| D120-80 | 96~140 | 216~1056 | 61.6~70.4 | 132~560 |
| D120-100 | 96~140 | 261.6~1320 | 69.5~73 | 220~900 |
| 125D25 | 72~119 | 35~230.4 | 70.5~77.5 | 22~90 |
| D150-50 | 120~180 | 127.5~660 | 72~75 | 110~400 |
| D150-80 | 120~180 | 228~1056 | 65~75 | 185~710 |
| D150-100 | 120~180 | 261.6~1320 | 69.5~73 | 220~900 |
| D150-130 | 120~180 | 354~1644 | 62.5~64 | 315~1250 |
| D155-30 (150D30) |
100~185 | 81.6~400.8 | 65.5~73.2 | 75~250 |
| D155-67 | 100~185 | 179.4~895.2 | 63~74 | 132~560 |
| D200-50 | 132~240 | 135~696 | 78~81 | 132~500 |
| D200-80 | 132~240 | 216~1044 | 70.9~75 | 220~900 |
| D200-100 | 132~240 | 252~1356 | 70~76 | 250~1000 |
| D280-43 (200D43) |
185~335 | 116.1~564 | 70.5~76.7 | 160~630 |
| D280-65 (200D65) |
185~335 | 184.5~816 | 63.3~74 | 250~1000 |
| D280-95 | 185~335 | 273~1200 | 68~72.5 | 400~1600 |
| D280-100 | 185~335 | 279~1248 | 58.6~72.6 | 400~1600 |
| D300-65 | 240~350 | 180~828 | 69.2~69.5 | 315~1120 |
| D360-40 | 300~440 | 106.5~504 | 77~80 | 185~710 |
| D360-60 | 300~440 | 157.5~768 | 71~74.5 | 355~1250 |
| D360-95 | 300~440 | 267~1224 | 70~73 | 500~2000 |
| D420-95 | 350~500 | 263~1192 | 67.9~71 | 560~2240 |
| D450-40 | 330~500 | 112.5~528 | 73.9~76.9 | 220~1000 |
| D450-60 (250D60) |
335~500 | 162.9~765.6 | 74.1~78.9 | 355~1400 |
| D450-95 | 335~500 | 267~1200 | 72~75 | 560~2240 |
| D500-57 | 375~555 | 109.6~717.6 | 69.7~82.6 | 220~1400 |
| D550-40 | 400~600 | 76~528 | 75.1~78.4 | 185~1120 |
| D550-50 | 400~600 | 95~660 | 75.1~77.8 | 220~1400 |
| D550-95 | 400~600 | 182~1230 | 70.9~72.4 | 450~2800 |
| D580-60 | 450~640 | 113~780 | 75.5~76.8 | 280~1800 |
| D580-100 | 450~640 | 190~1284 | 70~74 | 500~2800 |
| D600-60 | 450~710 | 104~780 | 79~82 | 280~1800 |
| D600-85 | 450~710 | 162~1092 | 72.4~73.6 | 450~2800 |
| D650-80 | 540~715 | 154~1005 | 73.5~75.5 | 450~2800 |
| D650-100 | 540~715 | 193~1256 | 79.2~83 | 500~2800 |
| D720-60 | 550~850 | 106.8~738.1 | 79.2~82.4 | 355~2240 |
| D720-80 | 550~850 | 149~931.8 | 72.9~76 | 630~2800 |
| D720-100 | 550~850 | 186~1059 | 76.5~84 | 560~2800 |
| D800-80 | 620~900 | 150~951.5 | 73~81 | 500~2800 |
Kind advice: click on the specific model series above to see more detailed parameters and corresponding performance curve graphs.
Why Choose Us?
Changsha Zhonglian Pump Industry Co., Ltd. was established in 1989, following the reform of the Changsha Water Pump Factory. It is a national high-tech comprehensive enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Stock Exchange on December 31, 2019, with the abbreviated name "Zhonglian Pump Industry" and stock code: 600275HN. It is currently a key enterprise in China's centrifugal pump industry and one of the leading domestic manufacturers of multi-stage pumps, headquartered in Changsha, Hunan, a historical and cultural city in China.
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Models in stock can be shipped by the next day at the latest. Others are custom-made, and depending on the product size and specific project conditions, the delivery time is generally between 7-90 days. Please consult our sales manager for details: 0731-88632200 。
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