Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    Multistage boiler feed pump type DG
    Multistage boiler feed pump type DG
    Multistage boiler feed pump type DG
    Multistage boiler feed pump type DG
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    • Multistage boiler feed pump type DG
    • Multistage boiler feed pump type DG
    • Multistage boiler feed pump type DG
    • Multistage boiler feed pump type DG

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    Multistage pump

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    Pump

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    Multistage boiler feed pump type DG

    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: 0.79-16.8 thousand

     

    Suitable for transporting clean water at temperatures below 250°C, or non-corrosive liquids with physical-chemical properties similar to water, widely used in power plants, metallurgy, heating, and other sectors for supplying water to boilers, with a maximum lifting height of up to 1800 meters.

    +86 0731-88192288

    Customer service hotline

    info@cipump.com

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    Product Description Product Specifications Why Choose Us? FAQ

    Product description

    　　The multi-stage boiler feed pump type DG is a segmented multi-stage horizontal centrifugal pump with single suction, suitable for transporting clean water at temperatures below 250°C or non-corrosive liquids with physical-chemical properties similar to water. It is widely used in power plants, metallurgy, heating, and other sectors for boiler feed, with a maximum lift height of up to 1800 meters. The casing of the boiler feed pump can be disassembled axially along the axis line. The pump model DG85-80×8 has the suction inlet oriented vertically upwards and the outlet also vertically upwards, perpendicular to the axis. From the drive side, the direction of rotation of the boiler water pump is clockwise. The manufacturer Zhonglian Pump Industry can produce pumps with counterclockwise rotation according to user needs, which must be specified when placing the order.

    ↑Series of multi-stage boiler feed pumps DG150-50×5↑

    Parameter range of the multi-stage boiler feed pump type DG

    ● Flow: 3.7-1350m³/h● Lift height: 49-1800m● Efficiency: 36-84%
    ● Power: 3-2800kw● Required NPSH: 2.2-8.3m● Weight of the pump: 151-7384kg

     

    Explanation of the model of the multi-stage boiler feed pump type DG

    Model: DG12-50×3

    DG — Multi-stage boiler feed pump

    12 — Design flow of 12.5m3/h

    50 — Design lift height per stage of 50m

    3 — Number of stages: 3

     

    Type of structure of the multi-stage boiler feed pump type DG

    The multi-stage boiler feed pump type DG is a segmented multi-stage horizontal centrifugal pump with a single casing and single suction, with vertical inlet and vertical outlet upwards. The specific structure is as follows:

    1. Stator part: mainly composed of the front section, middle section, guide vanes, rear section, bearing support, and balance chamber cover, connected by rods and nuts. The wings of the front and rear sides are fixed to the pump seat with bolts and nuts.

    2. Rotor components: mainly composed of the impeller, impeller stop sleeve, balance sleeve, balance disc, and shaft sleeve, secured with small round nuts and fixed to the shaft with keys to prevent rotation. The rotor is supported by bearings at both ends. The rotor is directly connected to the motor via a pin coupling. To compensate for expansion, a toothed washer is installed between the last stage and the balance sleeve, which must be replaced during pump maintenance.

    3. Balance mechanism: this pump uses a fully automatic axial balance hydraulic device composed of four pieces: balance plate, balance disc, balance sleeve, and balance stop sleeve.

    4. Direction of rotation: viewed from the motor end, the pump rotates clockwise.

    5. Material of the parts: the parts that pass the fluid of the pump, except for models DG85-80 and 200DG43 which are made of cast steel, are made of cast iron.

    6. Scope of supply: complete supply of pump, motor, check valve, gate valve, common base or own base.

     

    Main materials of the parts of the multi-stage boiler feed pump type DG

    ● Inlet and outlet section: ZG230-450● Middle section: ZG230-450● Guide vanes: QT450
    ● Impeller: QT450● Main shaft: 40Cr● Sealing ring: QT450
    ● Shaft sleeve: HT250● Balance disc: ZG2Cr13● Balance ring: tin bronze

    Kind reminder: users can contact the technical staff of Zhonglian Pump Industry for reasonable configuration according to site conditions and needs.

     

    Steps for installing the multi-stage boiler feed pump type DG

    1. Preparation

    Before assembly, all pump parts, especially the machined surfaces that fit together, must be thoroughly cleaned.

    Count all parts and classify and number them according to the assembly order.

    2. Assembly of the pump parts

    Pay attention to correctly install the sealing ring of the middle section to prevent it from falling.

    Ensure to correctly align the anti-rotation pin of the guide vanes.

    Tighten the casing rod nuts symmetrically to maintain proper tension; insufficient tightening may cause leaks at the middle section joint, while excessive tightening may deform the stator parts. The tightening torque with the wrench during assembly should be approximately 5550 Nm. Tighten the rods symmetrically.

    After basically tightening the rods, use an indicator to check that the non-parallelism between the front and rear sections is ≤0.1mm. Measure the total deviation of the rotor, which must meet the requirements of the assembly drawing.

    Install the front cover, low-pressure end cover, bearings, and lower bushings, and raise the shaft to the central position.

    Use a special lifting device and an indicator to check the oscillation of the balance sleeve face, which must meet the requirements of the general assembly drawing.

    Assemble the rotor components and tighten the locking nuts. The deviation after installing the balance disk must meet the requirements of the general assembly plan.

    Install the end caps, the bearing body, and the upper and side bushings, ensuring that the clearances meet the specified values for the quality of the bushings.

    Adjust the center of the bushings on both sides and, once adjusted, lock the adjustment nuts.

    3. Thrust bearing assembly

    The assembly of the thrust bearing components is done by scraping the copper sheets according to the requirements of the bearing component; when assembling, the thrust sheets must rotate flexibly. 1.9.2 After installing the thrust bearing, the axial play between the balance disk and the balance sleeve must be between 0.04 and 0.08 mm according to the requirements of the general assembly drawing, and the play adjustment is done with an adjustment ring.

    After adjusting the play, install the thrust bearing and the thrust disk, and tighten the locking nut.

    The pump body and the pump cover form the working chamber of the impeller; on the water inlet and outlet flanges, there are threaded holes to install vacuum and pressure gauges, and at the bottom of the pump body, there are threaded holes to drain the wastewater.

    The impeller is a simple and closed suction type, with a balance disk that balances most of the axial force, and a thrust bearing that supports the small residual part of the axial force; the arrangement of the bearing keeps the shaft in a stable state of tension bar. Before assembly, the impeller must undergo strict static balance verification to ensure smooth operation.

    The pump shaft is supported by two Babbitt alloy sliding bearings, which are mounted in the bearing body in the pump support and lubricated with light oil.

    In the pump body, there is a sealing ring that can improve the volumetric efficiency of the pump and, on the other hand, prevent high-pressure water from returning to the suction chamber, disturbing the inlet flow field, thus ensuring the suction performance of the pump.

    The shaft seal is generally a soft packing seal; during the operation of the pump, it may allow a small amount of medium to reach the packing box, and it can also be externally connected to cooling and lubrication water, acting as a water seal and for cooling and lubrication. According to user needs, the packing seal can be replaced with a mechanical seal.

    The play between the thrust bearing seat and the thrust disk is adjusted with wedges to ensure the thrust bearing play requirements according to the general assembly drawing.

    Product Parameters

    Performance parameters of the multistage boiler feed pump type DG

    Model
    Series     		Flow range
    (m³/h)     		Lifting height range
    (m)     		Efficiency range
    (%)    		 Compatible power range
    (kw)
    DG6-25 3.75~7.5 70.35~320.3 36~49.5 5.5~18.5
    DG6-50 3.75~7.5 144~624 28~30 15~55
    DG6-80 3.75~7.5 225~982 32~36 15~75
    DG12-25 7.5~15 68.3~325.3 43.3~52.1 7.5~30
    DG12-50 7.5~15 142.7~635 30.6~44.6 18.5~75
    DG12-80 7.5~15 225~982 37~40 30~132
    DG25-30 15~30 77.7~418.8 55.2~56.9 15~55
    DG25-50 15~30 144~618 44~54 22~110
    DG25-80 15~30 228~1013 47~56 37~160
    DG46-30 30~55 76.2~429 60~66.8 22~90
    DG46-50 30~55 138.3~658.8 53.6~64.5 37~160
    DG46-80 30~55 228~1056 59~65 55~250
    80D12 21.6~39.6 19~129.6 69~75 4~18.5
    DG65-80 50~75 228~1056 60~67 75~315
    100D16 37.6~72 20.4~178.2 66~73 7.5~37
    DG85-45 55~100 121.8~612 64.2~70.4 55~200
    DG85-67 55~100 186.9~888 56.1~68.4 90~315
    DG85-80 55~100 228~1056 59~71 110~450
    DG85-150 55~100 429~1872 53~60 220~900
    DG100-25 72~119 46~270 63.4~69 30~132
    DG100-55 85~120 147~708 64.4~68 90~315
    DG120-50 96~140 126.9~654 72~78 90~280
    DG120-67 96~140 183~840 62~71 110~450
    DG120-80 96~140 216~1056 61.6~70.4 132~560
    DG120-100 96~140 261.6~1320 69.5~73 220~900
    125D25 72~119 35~230.4 70.5~77.5 22~90
    DG150-50 120~180 127.5~660 72~75 110~400
    DG150-80 120~180 228~1056 65~75 185~710
    DG150-100 120~180 261.6~1320 69.5~73 220~900
    DG150-130 120~180 354~1644 62.5~64 315~1250
    DG155-30
    (150D30)     		100~185 81.6~400.8 65.5~73.2 75~250
    DG155-67 100~185 179.4~895.2 63~74 132~560
    DG200-50 132~240 135~696 78~81 132~500
    DG200-80 132~240 216~1044 70.9~75 220~900
    DG200-100 132~240 252~1356 70~76 250~1000
    DG280-43
    (200D43)     		185~335 116.1~564 70.5~76.7 160~630
    DG280-65
    (200D65)     		185~335 184.5~816 63.3~74 250~1000
    DG280-95 185~335 273~1200 68~72.5 400~1600
    DG280-100 185~335 279~1248 58.6~72.6 400~1600
    DG300-65 240~350 180~828 69.2~69.5 315~1120
    DG360-40 300~440 106.5~504 77~80 185~710
    DG360-60 300~440 157.5~768 71~74.5 355~1250
    DG360-95 300~440 267~1224 70~73 500~2000
    DG420-95 350~500 263~1192 67.9~71 560~2240
    DG450-40 330~500 112.5~528 73.9~76.9 220~1000
    DG450-60
    (250D60)     		335~500 162.9~765.6 74.1~78.9 355~1400
    DG450-95 335~500 267~1200 72~75 560~2240
    DG500-57 375~555 109.6~717.6 69.7~82.6 220~1400
    DG550-40 400~600 76~528 75.1~78.4 185~1120
    DG550-50 400~600 95~660 75.1~77.8 220~1400
    DG550-95 400~600 182~1230 70.9~72.4 450~2800
    DG580-60 450~640 113~780 75.5~76.8 280~1800
    DG580-100 450~640 190~1284 70~74 500~2800
    DG600-60 450~710 104~780 79~82 280~1800
    DG600-85 450~710 162~1092 72.4~73.6 450~2800
    DG650-80 540~715 154~1005 73.5~75.5 450~2800
    DG650-100 540~715 193~1256 79.2~83 500~2800
    DG720-60 550~850 106.8~738.1 79.2~82.4 355~2240
    DG720-80 550~850 149~931.8 72.9~76 630~2800
    DG720-100 550~850 186~1059 76.5~84 560~2800
    DG800-80 620~900 150~951.5 73~81 500~2800

    Kind advice: click on the specific model series above to see more detailed parameters and corresponding performance curve graphs.

    Changsha Zhonglian Pump Industry Co., Ltd.

    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.

    Changsha Zhonglian Pump Industry Co., Ltd.
    Changsha Zhonglian Pump Industry Co., Ltd.

    FAQ

    Q

    What products do you mainly produce?

    A

    Zoomlion Pump Industry manufactures various large industrial centrifugal pumps. The main products include: self-balancing multistage pumps, multistage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condenser pumps, and more.

    Q

    Can you help me choose a model?

    A

    Of course! If the water pump model is not selected accurately, it can cause significant problems. After you take it back, it might be either too small to meet the usage requirements or too large, resulting in higher electricity and fuel costs, increasing the operating expenses.

    Q

    Why is the price quotation so slow?

    A

    Because centrifugal pumps are non-standard custom products with many models and a wide price range. Even for the same model, the price varies greatly depending on the materials and configurations used. Taking the most common pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clearly confirm the relevant information to provide you with an accurate price. Normally, if you provide comprehensive information, we can quote within 5 minutes.

    Q

    What information should I provide when I need a quote?

    A

    Usually, if you want to get an accurate quote, it is recommended that you provide us with the following information: pump flow rate, head, on-site operating voltage, frequency, temperature of the conveyed liquid, pH value, solid particle content, on-site installation conditions (horizontal or vertical installation), and other related details. If you are not very familiar with these, it’s okay; our sales manager will assist you in determining them.

    Q

    Do you have centrifugal pumps in stock?

    A

    There are many models and configurations of centrifugal pumps. Except for a small number of commonly used standard models that are in stock, the vast majority of models and configurations are not stocked and are customized products. We need to first select the pump based on your site conditions such as flow rate, head, medium temperature, pH value, and installation conditions. After determining the pump model and configuration, we can then place an order with the workshop for production.

    Q

    What is your usual delivery time?

    A

    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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