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

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    Self-balancing multistage boiler feed pump type DGP
    Self-balancing multistage boiler feed pump type DGP
    Self-balancing multistage boiler feed pump type DGP
    Self-balancing multistage boiler feed pump type DGP
    Self-balancing multistage boiler feed pump type DGP
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    • Self-balancing multistage boiler feed pump type DGP
    • Self-balancing multistage boiler feed pump type DGP
    • Self-balancing multistage boiler feed pump type DGP
    • Self-balancing multistage boiler feed pump type DGP
    • Self-balancing multistage boiler feed pump type DGP

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    Boiler Feedwater Pump

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    Pump

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    Self-balancing multistage boiler feed pump type DGP

    Flow: 3.7-1350m³/h

    Lifting height: 73-1800m

    Efficiency: 32%-84%

    Pump weight: 158-6256kg

    Motor power: 5.5-4500kw

    NPSH (Net Positive Suction Head): 2.0-7.0m

    Price: 31200-288000

     

    Mainly used to transport clean water without solid particles, with a temperature from -20℃ to 210℃, or liquids with physical-chemical properties similar to clean water. Suitable for medium, low, and high pressure water supply.

    +86 0731-88192288

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    info@cipump.com

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    Product Description Product Specifications Why Choose Us? FAQ

    Product description

    As one of the recognized domestic manufacturers of multistage centrifugal pumps, to actively respond to the national call for energy saving and sustainable development, our company, after studying and adopting advanced technologies from similar foreign products and combining years of pump design experience, has developed a series of high-efficiency and energy-saving self-balancing multistage centrifugal pumps. This series uses hydraulic models recommended by the country, developed according to API610 standards, with advantages such as high energy efficiency, wide performance range, reasonable structure, good cavitation resistance, safe and stable operation, low noise, few wear parts, and easy installation and maintenance, positioning itself at the technological forefront of the industry.

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    The DGP type self-balancing multistage boiler feed pump is a high-pressure boiler circulation pump mainly used to feed water to the boiler and maintain water circulation. Its main function is that when the pipeline network pressure drops to a minimum level (pressure), the feed pump activates to replenish water to the set level (pressure). The DGP type self-balancing multistage centrifugal pump innovates on the traditional multistage pump structure by eliminating the axial force balance device of common multistage pumps and uses the mutual cancellation of forces from symmetrically arranged rotor components of the impeller to balance axial force, effectively solving axial displacement. During operation, there is no efficiency loss caused by friction of the balance disk or reflux, increasing efficiency by 3-12% compared to similar common multistage pumps. Additionally, it completely eliminates failures such as wear or blockage of the balance disk and seat due to balance device failures, significantly extending the pump's service life. After years of user operation, it has been proven that the series of self-balancing multistage centrifugal pumps produced by our company has much higher reliability and efficiency than traditional D-type multistage pumps, with a failure-free operation time more than three times longer, effectively extending service life, which not only directly saves production costs for users but also considerably reduces operation and maintenance costs. The DGP type self-balancing multistage centrifugal pump is the main model for hot water transport or circulation within the series, serving as a substitute product for traditional DG type multistage pumps with balance disks or drums, and is widely applied in water supply for pressure vessels, hot water circulation, water supply in high-rise buildings, agricultural irrigation, fire pressure boosting, hydraulic cleaning, municipal supply and drainage, urban heating, food, pharmaceutical, chemical industries, aquaculture, environmental protection, among others.

     

            Image 1   Scope of application of the DGP type self-balancing multistage boiler feed pump

    　　The self-balancing multistage boiler feed pump is mainly used to transport hot water, oils, and media without solid particles, with temperatures between -20℃ and 210℃, abrasive or with physical-chemical properties similar to clean water.

     

            Image 1   Structural diagram of the DGP type self-balancing multistage boiler feed pump

     

     

     

    Anatomical diagram of the self-balancing multistage pump structure
     
     
    Structural diagram of the self-balancing multistage pump
    Structure of the parts of the self-balancing multistage pump
     

     

     

            Image 1   Structural form of the DGP type self-balancing multistage boiler feed pump

         

    1. Stator part: mainly composed of the suction section (water inlet), middle section, discharge section (water outlet), guide vanes, secondary water inlet section, packing body (rear cover), and bearing body, all connected with tension bolts forming a unit. From the coupling end, the pump inlet is oriented horizontally to the right and the outlet vertically upwards.

    2. Rotor part: mainly composed of shaft, impeller, throttling shaft components, bearings, and sleeves.

    3. Pump sealing

    3.1 The static joint surfaces between the suction section (water inlet), middle section, discharge section (water outlet), and the secondary water inlet section are sealed with sealing adhesive or molybdenum disulfide.

    3.2 Throttling sealing is used between the pump stages.

    3.3 Axial seals on both sides of the pump use soft packing.

    3.4 A water retention ring is used to prevent water from entering the bearings.

    4. Bearing part

    The complete pump rotor is supported by a cylindrical roller bearing at the drive end according to standard 《GB/T283-94》 and an angular contact ball bearing at the opposite end according to standard 《GB/T292-94》. The bearings use mechanical oil CD30 or CD40 added to the bearing body up to the center of the oil sight glass for lubrication. Due to the use of the angular contact ball bearing according to 《GB/T292-94》, the assembled rotor shows no axial displacement.

    5. The self-balancing multistage boiler feed pump has support at both ends, the casing is segmented, and the pump transmission is connected to the motor by a cylindrical pin elastic coupling.

    Pump rotation direction: viewed from the drive end, the pump rotates clockwise.

     

            Image 1   DGP type self-balancing multistage boiler feed pump Operating principle

    　　The pump shaft, driven by the motor, rotates the impeller, doing work on the liquid and increasing its kinetic energy, so that the required amount of liquid passes successively from the suction pool through the pump inlet section, direct impeller, direct guide vanes, middle section, horizontal outlet, transition tube, secondary inlet section, reverse impeller, reverse guide vanes, to the vertical outlet, and then discharges to the demand point.

     

     

            Image 1   Customer cases of the DGP type self-balancing multistage boiler feed pump

     

     

    Operation site of the Zhonglian Pump Industry DG type multistage pump acquired by the Shuangliao power plant in Jilin province

     

     

           Image 1   Top 10 advantages of the self-balancing multistage pump VS traditional multistage pump

    1. New structure: The self-balancing multistage centrifugal pump has a rotor with a symmetrically arranged impeller, which causes the axial forces generated by the impeller groups in positive and negative directions to cancel each other out, eliminating the balance disc device that has small clearances, high pressure drop, easy erosion, wear, and failures, overcoming the traditional structure of multistage pumps.

    2. New technology: The self-balancing multistage centrifugal pump has unique throttling, pressure reduction, and balancing devices on odd stages, which can also act as auxiliary support.

    3. High efficiency and energy saving: The self-balancing multistage centrifugal pump uses an advanced hydraulic model that solves the wear and axial pulsation caused by the balance disc, always maintaining excellent centering between the impeller and guide vanes. During prolonged use, it prevents significant efficiency reduction caused by balance disc wear and rotor displacement in common multistage pumps, in addition to eliminating balance water leakage, reducing volumetric loss, generally improving the pump's operational efficiency, and reducing shaft power, with an average efficiency 3%-12% higher than common multistage pumps.

    4. High reliability: The self-balancing multistage centrifugal pump uses a self-balancing system that basically cancels the axial force load during operation, minimizing rotor wear and system interference. The small residual axial force is supported by the thrust bearing, keeping the pump shaft always in tension, with a uniform load distribution and a significant reduction in peak stress compared to the original structure, improving rotor stiffness and critical speed, and notably increasing rotor operation stability and reliability.

    5. High stability: The self-balancing multistage centrifugal pump, thanks to the excellent symmetrical combination of the impeller and guide vanes, along with a reasonable coupling space and a wide axial throttling design, maintains high stability and operational efficiency even after prolonged operation.

    6. Good cavitation performance: The self-balancing multistage centrifugal pump uses an optimized hydraulic model and structural design, with a double-suction impeller in the first stage, as well as precise casting and wear-resistant materials, giving it good cavitation performance. The machine operates stably and quietly, without the user needing to install a preliminary pump or raise the inlet tank height.

    7. High mechanical seal reliability: Because the rotor of the self-balancing multistage centrifugal pump has no axial displacement or axial pulsation during start-up and shutdown, the problem of low mechanical seal reliability that has always affected multistage pumps has been overcome.

    8. Easy maintenance: The self-balancing multistage centrifugal pump is designed in 3D, with rotor components machined by numerical control, strictly ensuring the dimensions and precision of each part. This allows quick assembly and disassembly, and replacement of seals and bearings without dismantling the pump body or inlet and outlet pipes. General technical personnel can complete the process by following the assembly diagram's order and requirements, completely avoiding the need for specialized technicians to adjust and position axial clearance, providing great convenience to the user.

    9. Low maintenance rate: The self-balancing multistage centrifugal pump uses precise casting, reducing wear parts and the frequency of disassembly for maintenance, prolonging product life and largely avoiding problems caused by frequent disassemblies, which reduces maintenance costs.

    10. High adaptability: The self-balancing multistage centrifugal pump adopts an advanced combined modular design, with local components tested by intensive and prolonged use, which have high interchangeability. The balance disc device with small clearances is eliminated, adapting better than traditional multistage pumps to media with more adverse properties.

          

           Image 1   Comparative cost chart between self-balancing multistage centrifugal pump and traditional multistage pump

    Cost analysis of the self-balancing multistage pump and the traditional multistage pump

    Product Parameters

    Description of the self-balancing multistage boiler feed pump model type DGP

     

    Performance parameters of the self-balancing multistage boiler feed pump type DGP (These data are for reference only, please take the actual order as the standard!)

     

    DG6-25P

    DG6-50P

    DG6-80P

    DG12-25P

    DG12-50P

    DG12-80P

    DG25-30P

    DG25-50P

    DG25-80P

    DG46-30P

    DG46-50P

    DG46-80P

    DG65-80P

    DG85-45P

    DG85-67P

    DG85-80P

    DG85-150P

    DG100-55P

    DG120-50P

    DG120-67P

    DG120-80P

    DG120-100P

    DG150-30P

    DG150-50P

    DG150-80P

    DG150-100P

    DG150-130P

    DG155-30P

    DG155-67P

    DG200-50P

    DG200-80P

    DG200-100P

    DG200-150P

    DG280-43P

    DG280-65P

    DG280-95P

    DG280-100P

    DG300-45P

    DG300-65P

    DG360-40P

    DG360-60P

    DG360-95P

    DG420-95P

    DG450-40P

    DG450-60P

    DG450-95P

    DG500-57P

    DG550-40P

    DG550-50P

    DG550-95P

    DG580-60P

    DG580-100P

    DG600-60P

    DG600-85P

    DG650-80P

    DG650-100P

    DG720-60P

    DG720-80P

    DG720-100P

    DG800-80P

    DG850-100P

    DG900-60P

    DG1100-85P

    200DG43P

    		 

    For more performance parameters of the self-balancing multistage boiler feed pump type DGP, please visit Pump Selection Download the intelligent selection software on the page or call: 0731-88192288 for more information.

    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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