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

language
    language

    Reasons for Bearing Failure in Wear-Resistant Multistage Centrifugal Pumps Used in Mining and Tips to Extend Their Lifespan

    Publication Date:

    2025-10-28

    Author:

    Source:

    Facebook Linkedin Twitter Tumblr Pinterest

    Mining wear-resistant multistage centrifugal pump It is a critical piece of equipment for industrial fluid transportation, and as the core transmission component, the bearing's operational status directly affects the pump's energy efficiency and overall lifespan. However, during prolonged use, bearings inevitably experience performance degradation or even failure—issues that not only reduce equipment efficiency but can also lead to sudden malfunctions. In this article, a manufacturer of multistage centrifugal pumps Changsha Zhonglian Pump Industry We will analyze for you: the causes of bearing failure in wear-resistant, multi-stage centrifugal pumps used in mining applications, as well as tips to extend their lifespan—helping your company reduce equipment wear and lower operational maintenance costs.

     

    Mining multi-stage centrifugal pump

     

    I. The Core Causes of Bearing Failure

     

    1. Material Fatigue and Mechanical Loss

    When bearings operate at high speeds, the inner and outer races as well as the rolling elements are constantly subjected to cyclic loads. Over time, these repeated stress cycles can lead to the formation of microscopic fatigue cracks within the material. As operation continues, these cracks gradually propagate, potentially resulting in surface spalling, dimensional deformation, and other critical issues. Additionally, if the fit between the bearing and the shaft is not precise enough—such as excessive looseness causing wobbling or excessive tightness leading to binding—the contact surfaces will experience intensified mechanical wear, further accelerating performance degradation.

     

    2. Lubrication System Abnormality

    Lubrication is key to ensuring the stable operation of bearings. If the amount of grease added is insufficient, it can lead to direct metal-to-metal contact and friction, generating excessive heat. Additionally, if the grease is left unreplaced for an extended period or if the wrong type is selected—for instance, using high-temperature grease in low-temperature environments—oxidation and hardening will occur, causing the grease to lose its lubricating properties. Both scenarios significantly accelerate bearing wear and ultimately shorten the component's effective service life.

     

    3. Environmental factor erosion

    The working environment significantly affects the performance of bearings:

    High-humidity environments easily lead to rusting of bearing metal surfaces, compromising their original precision.

    High-temperature environments accelerate the aging and failure of grease, while simultaneously reducing the mechanical strength of bearing materials.

    Operating conditions involving dust and corrosive gases (such as in chemical plants or mining environments) can allow impurities to penetrate inside the bearings, leading to abrasive wear and chemical corrosion, which directly result in performance degradation.

     

    4. Long-term Overloading Operation

    Mining wear-resistant multistage centrifugal pump There are clearly defined rated parameters (such as flow rate and head), but if the actual operating load exceeds the bearing's design capacity—particularly under conditions like frequent starts and stops or abnormally high viscosity of the conveyed medium—it can lead to excessive radial or axial forces on the bearing, accelerating material fatigue and potentially causing premature failure.

     

    5. Improper installation and maintenance

    If installation is not performed according to technical standards—such as bearing housing misalignment or uneven tightening torque of bolts—it can lead to uneven loading on the bearing during operation, resulting in additional stress. Additionally, inadequate daily maintenance—like failing to regularly clean the bearing housing or promptly replacing damaged seals—will allow contaminants to enter and lubrication to fail, causing these issues to worsen over time and accelerating the degradation of bearing performance.

     

     

    II. Practical Solutions to Extend Bearing Life

     

    1. Optimize Lubrication Management

    Select the appropriate grease according to the equipment manual (e.g., choose complex lithium-based grease for high-temperature conditions), and regularly inspect the oil's condition—typically after each operation. 20003000 Change it once every hour;

    Strictly control the amount of grease added (typically to about the bearing cavity's volume) 1/22/3 ), avoiding excessive amounts that could lead to poor heat dissipation, or insufficient amounts that might cause dry friction.

     

    2. Improve the work environment

    In humid and dusty environments, install a protective cover for the pump body and, if necessary, equip it with dehumidification and dust removal devices.

    Under high-temperature conditions, adding a cooling system (such as a water-cooling jacket) helps keep the bearing's operating temperature within… 70℃ The following;

    In corrosive environments, select stainless steel bearings or apply anti-corrosion coatings to minimize chemical erosion.

     

    3. Avoid operating under overload conditions

    Install flow and pressure sensors to monitor the pump's operating parameters in real time, ensuring operation within the rated range.

    When conveying high-viscosity media, pre-treat it in advance (e.g., by heating or dilution) to reduce operational load.

    Reduce unnecessary frequent starts and stops, check whether the impeller is stuck before starting, and minimize instantaneous impact loads.

     

    4. Proper Installation and Maintenance

    When installing, use specialized tools (such as a bearing heater) to ensure proper fit accuracy and avoid forceful hammering.

    Regularly (recommended monthly) inspect the bearing's operating condition by listening for unusual noises, measuring temperature (to check for overheating), and monitoring vibration (to determine if the frequency is abnormal).

    Promptly replace aged seals to prevent medium leakage from contaminating the bearings, while also cleaning out impurities and old grease from within the bearing housing.

     

    By addressing the above issues in a targeted manner, it is possible to effectively slow down Mining wear-resistant multistage centrifugal pump The degradation of bearing performance enhances equipment operational stability while reducing enterprise maintenance costs and downtime losses. In daily operations, it is recommended to develop a personalized maintenance plan based on equipment operating records, ensuring that bearings consistently maintain optimal working conditions.

    Previous:

    How to choose a high-flow, low-head pump?

    Next:

    Core Requirements and Replacement Steps for Multi-Stage Centrifugal Pump Packing Seals

    Related Products