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

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    Analysis of the Structural Positioning of the Balance Pipe and Axial Force Balancing Technology in Horizontal Multistage Centrifugal Pumps

    Over many years of development, the axial-force-balancing system in horizontal multistage centrifugal pumps has become a critical factor affecting operational stability. In horizontal multistage centrifugal pumps employing balance discs and bell-type structures, the balance pipe—acting as a key component in single-stage centrifugal pumps—achieves axial-force cancellation through pressure-guided balancing. In the following discussion, a technical engineer from Changsha Zhonglian Pump Industry, a leading centrifugal-pump manufacturer, will provide a technical analysis of the structural positioning of the balance pipe in horizontal multistage centrifugal pumps and the associated axial-force-balancing technology.

    03-22

    2026

    Analysis of the Structural Positioning of the Balance Pipe and Axial Force Balancing Technology in Horizontal Multistage Centrifugal Pumps
    Analysis of the Structural Positioning of the Balance Pipe and Axial Force Balancing Technology in Horizontal Multistage Centrifugal Pumps

    Structural Design, Operating Principle, and Engineering Applications of the GS-Type Energy-Saving Split-Casing Pump by Zoomlion Pump Industry in Changsha

    Changsha Zhonglian Pump Industry, a leading manufacturer of split-case pumps, will systematically dissect the structure, operating principles, and engineering applications of our GS-series energy-efficient split-case pumps from two core technical perspectives—structural characteristics and operating principles—and draw on real-world project case studies. This comprehensive analysis will provide you with a thorough understanding of the pump’s technical advantages and intrinsic value, serving as a professional reference for equipment selection and application within the industry.

    03-21

    2026

    Structural Design, Operating Principle, and Engineering Applications of the GS-Type Energy-Saving Split-Casing Pump by Zoomlion Pump Industry in Changsha
    Structural Design, Operating Principle, and Engineering Applications of the GS-Type Energy-Saving Split-Casing Pump by Zoomlion Pump Industry in Changsha

    Technical Specifications and Application Guide for Rust Prevention in Multistage Centrifugal Pumps

    Multistage centrifugal pumps manufactured by Changsha Zoomlion Pump Industry are widely used in industrial applications. However, their complex design and demanding operating environments often lead to corrosion, which can adversely affect pump performance and service life. To address the need for corrosion protection in multistage pumps, and drawing on years of technical expertise accumulated by Changsha Zoomlion Pump Industry, a set of technical specifications and application guidelines for corrosion prevention in multistage centrifugal pumps has been developed for reference by user organizations.

    03-20

    2026

    Technical Specifications and Application Guide for Rust Prevention in Multistage Centrifugal Pumps
    Technical Specifications and Application Guide for Rust Prevention in Multistage Centrifugal Pumps

    Solution for Addressing Negative Pressure Issues in High-Flow, High-Head Multistage Centrifugal Pumps

    During operation, large-flow, high-head multistage centrifugal pumps are susceptible to cavitation, which not only significantly degrades pump performance stability—resulting in flow fluctuations and head reduction—but also accelerates wear of the mechanical seal and triggers cavitation damage, ultimately shortening the equipment’s service life. Drawing on its technical expertise, Changsha Zoomlion Pump Industry has developed the following solutions to address the issue of negative pressure in large-flow, high-head multistage centrifugal pumps:

    03-19

    2026

    Solution for Addressing Negative Pressure Issues in High-Flow, High-Head Multistage Centrifugal Pumps
    Solution for Addressing Negative Pressure Issues in High-Flow, High-Head Multistage Centrifugal Pumps

    Operating Guide for Priming and Air Bleeding of Light-Duty Stainless Steel Multistage Centrifugal Pumps

    Operating Procedures for Water-Filling and Air-Exhaustion of Multistage Centrifugal Pumps at Changsha Zoomlion Pump Industry I. Applicable Scenarios: When a multistage centrifugal pump is commissioned for the first time, restarted after a prolonged shutdown, or when excessive air has accumulated inside the pump (resulting in inability to draw water), it is essential to ensure that the pump casing is completely filled with liquid and that all air is thoroughly purged. This prevents equipment damage caused by cavitation and dry running, thereby ensuring the efficient and stable operation of the multistage centrifugal pump unit.

    03-18

    2026

    Operating Guide for Priming and Air Bleeding of Light-Duty Stainless Steel Multistage Centrifugal Pumps
    Operating Guide for Priming and Air Bleeding of Light-Duty Stainless Steel Multistage Centrifugal Pumps

    Replacement Cycle and Selection & Maintenance Guide for High-Temperature Boiler Circulating Water Pumps

    In industrial production, high-temperature boiler circulating water pumps serve as the core power equipment for boilers, and their reliable operation directly affects process continuity and product quality. As a benchmark enterprise in domestic industrial pump manufacturing, Changsha Zoomlion Pump Industry has developed scientifically sound replacement-cycle plans tailored to different operating conditions, in accordance with GB/T 3216-2016 “Efficiency Grades and Test Methods for Centrifugal Pumps” and the ISO 9906 international standard.

    03-17

    2026

    Replacement Cycle and Selection & Maintenance Guide for High-Temperature Boiler Circulating Water Pumps
    Replacement Cycle and Selection & Maintenance Guide for High-Temperature Boiler Circulating Water Pumps

    Standardized Installation Technical Specification for Shafts and Impellers of Double-Suction Pumps (GB/T 3216-2016)

    Drawing on extensive engineering experience, the technical team at Changsha Zoomlion Pump Industry has developed the “Standardized Installation Technical Specification for the Shaft and Impeller of Centrifugal Double-Suction Pumps.” As a core piece of energy-efficient fluid-handling equipment, centrifugal double-suction pumps are widely used in water conservancy, chemical processing, power generation, and other sectors. The installation accuracy of the pump’s key components—the shaft and impeller—directly affects the pump’s operational efficiency, stability, and service life. The following procedure is formulated in accordance with the national standard GB/T 3216-2016 and based on many years of engineering practice at Changsha Zoomlion Pump Industry, with the aim of standardizing the installation process for the shaft and impeller.

    03-16

    2026

    Standardized Installation Technical Specification for Shafts and Impellers of Double-Suction Pumps (GB/T 3216-2016)
    Standardized Installation Technical Specification for Shafts and Impellers of Double-Suction Pumps (GB/T 3216-2016)

    Solutions to Prevent Failure of Multi-Stage Pump Mechanical Seals

    As the core component for shaft-end sealing in multistage pumps, mechanical seals not only lead to medium leakage and production interruptions when they fail frequently, but also increase the costs associated with spare part replacement and maintenance operations. Drawing on thousands of field failure analysis cases, Changsha Zoomlion Pump Industry has developed a comprehensive solution for multistage pump mechanical seals that emphasizes “precise selection, standardized installation, optimized operating conditions, and a closed-loop maintenance process.” This approach fundamentally extends the service life of mechanical seals and reduces the likelihood of failure.

    03-13

    2026

    Solutions to Prevent Failure of Multi-Stage Pump Mechanical Seals
    Solutions to Prevent Failure of Multi-Stage Pump Mechanical Seals

    What causes a multi-stage pump mechanical seal to fail within less than a month?

    During the operation of multistage pumps, mechanical seals often fail—exhibiting leakage and wear—within just one month, making this a frequent and troublesome issue for industrial enterprises. Not only does it lead to shutdowns for maintenance and production interruptions, but it also significantly increases the costs associated with component replacement and ongoing operations. Drawing on years of experience in the R&D, manufacturing, and field service of multistage pumps, Changsha Zoomlion Pump Industry has identified five core reasons behind the rapid failure of multistage pump mechanical seals. By taking into account actual operating conditions, they have developed targeted solutions to help users mitigate risks at their root.

    03-12

    2026

    What causes a multi-stage pump mechanical seal to fail within less than a month?
    What causes a multi-stage pump mechanical seal to fail within less than a month?

    Do multi-stage mining pumps have a short service life and aren’t very durable? Zhonglian Pump Industry will tell you where the root cause lies.

    03-10

    2026

    Do multi-stage mining pumps have a short service life and aren’t very durable? Zhonglian Pump Industry will tell you where the root cause lies.
    Do multi-stage mining pumps have a short service life and aren’t very durable? Zhonglian Pump Industry will tell you where the root cause lies.

    What causes backflow in wear-resistant multistage centrifugal drainage pumps used in coal mines?

    As a critical core piece of equipment for underground mine drainage and tailings transport, wear‑resistant multistage centrifugal drainage pumps used in coal mines are directly linked to safe mine production and the stable operation of the drainage system. Backflow—where the working medium leaks backward from the pump outlet to the inlet or circulates within the pump cavity—is a typical failure mode for this type of pump under the high-sand-content, high‑abrasion, and high‑pressure conditions prevalent in coal mines. Due to the high sand content and poor water quality in underground mine environments, backflow not only leads to a reduction in the pump’s actual discharge flow and an increase in energy consumption by 15%–30%, but also accelerates wear and cavitation in key flow components such as the impeller and sealing rings, shortening component service life by more than 50%. What’s more, backflow can trigger excessive pump vibration, pipeline surges, and even complete failure of the drainage system, posing significant risks to mine safety. In this article, Changsha Zoomlion Pump Industry, a manufacturer of mining multistage pumps, will draw on its practical experience in the operation and maintenance of underground mine drainage pumps to analyze the root causes of backflow in wear‑resistant multistage centrifugal drainage pumps used in coal mines, helping mining enterprises address issues at their source and ensuring the continuous, stable operation of their drainage systems.

    03-09

    2026

    What causes backflow in wear-resistant multistage centrifugal drainage pumps used in coal mines?
    What causes backflow in wear-resistant multistage centrifugal drainage pumps used in coal mines?

    Causes of Misalignment (Excessive Deviation in Coaxiality) of Couplings in Horizontal Multistage Pumps and On-site Remedial Measures

    During the long-term operation of horizontal multistage pumps, improper coupling alignment and excessive coaxial deviation are frequent causes of excessive vibration, bearing overheating, seal leakage, and abnormal wear of coupling rubber blocks or tooth surfaces. These issues directly affect the safe and stable operation of the pump unit. Such problems are not caused by a single factor alone; rather, they span the entire lifecycle—from manufacturing and installation to operating conditions and maintenance. In this article, technical personnel from Changsha Zhonglian Pump Industry, a manufacturer of multistage pumps, draw on their practical experience in on-site installation and repair to share insights into the root causes of misalignment (excessive coaxial deviation) in horizontal multistage pump couplings, as well as on-site troubleshooting methods. They also provide actionable preventive and corrective measures for users' reference.

    03-04

    2026

    Causes of Misalignment (Excessive Deviation in Coaxiality) of Couplings in Horizontal Multistage Pumps and On-site Remedial Measures
    Causes of Misalignment (Excessive Deviation in Coaxiality) of Couplings in Horizontal Multistage Pumps and On-site Remedial Measures
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