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

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    Technical Specifications and Practical Selection Guide for Packing Seal Technology in Multi-stage Pumps Used in Mine Drainage

    Publication Date:

    2025-12-09

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    As the core equipment of mine drainage systems, the multi-stage pump for mining applications is a horizontal multi-section type. Centrifugal pump , also known as Multistage centrifugal pump Its core application scenario is the drainage of underground mine water (mine water containing fine particulate matter, but not slurry transport). According to coal industry standards. MT/T 114-2005 This pump is suitable for conveying fluids containing solid particles ≤ 1.5% , temperature ≤ 80 For mine water at ℃, the choice of sealing method directly determines the reliability of the equipment. The sand content in groundwater is typically... 500-5000mg/L Particle size 0.1-1.0mm ), under such operating conditions, mechanical seals (mechanical seals) are prone to failure due to particle jamming. Industry-verified failure rates exceed... 40% ; and the packing seal uses graphite packing rings. + The pressurized water circulation system can effectively adapt to particulate media and achieve... 8000 Stable operation for more than one hour. In this article, the manufacturer of multi-stage pumps for mining applications... Changsha Zhonglian Pump Industry Let’s share the technical specifications and practical selection guidelines for packing seal technology used in multi-stage pumps for mine drainage, for reference by user organizations.

     

    Mine multistage pump

     

    I. Operating Condition Characteristics and Mandatory Requirements for Sealing Technology

    1.  Particle characteristics influence

    Sediment content of groundwater >1000 mg/L At this time, particles easily become embedded in the mechanical seal surface, leading to seal failure and pump body leakage.

    The packing seal uses flexible graphite packing rings, in combination with... 0.1-0.3MPa Pressure water circulation cools the system, forming a dynamic sealing layer that prevents particle intrusion.

    2.  Sealed structural design

    The stuffing box shall be equipped with an independent water-seal system (not a self-circulating system within the pump body). Pressurized water is injected into the sealing chamber to continuously flush the particles.

    Adjust the packing tightness to a “slightly permeable state.” 1-2 Drop / seconds), excessive tightness leads to accelerated wear, while excessive looseness results in leakage.

     

    II. The selection must strictly match the actual operating conditions of the mine to avoid indiscriminate application.

     

    Parameter Category Selection Criteria Typical value example
    Traffic Mine water inflow (m³/h) 85 m³/h (corresponding to MD85-67×4)
    Head height Mine depth + Pipeline resistance (m) 320 m (300 m well depth + over 20 m margin)
    Sediment concentration Measured Water Quality Report (mg/L) >1000mg/L requires high-chromium cast iron material.
    Sealing method Forced packing seal (Disable mechanical seal) Stuffing box + pressurized water circulation system
    Power supply conditions On-site grid matching (380V/50Hz preferred) Diesel engines are considered only for areas without electricity.

    III. Maintenance Essentials and Industry Practices

    1.  Gland Maintenance

    Clean the packing fouling quarterly (flush the packing chamber with high-pressure water);

    Check whether the pressurized water circulation pipeline is blocked (a blockage will lead to sealing failure).

    2.  Material matching

    Sediment concentration >1500mg/L : The flow passage components adopt Cr27 High-chromium cast iron (enhanced wear resistance) 30% );

    Acidic groundwater ( pH < 6 ): The pump body is made of duplex stainless steel (to prevent corrosion and perforation).

    3.  Pitfall Guide

    The use of “submersible pumps” is prohibited in mine drainage applications (all multistage pumps are vertical). / Horizontal structure);

    Reject “machine seal” + The “double-seal with filler” solution (particles can easily cause both seals to fail simultaneously).

     

    IV. Technical Value and Economic Benefits

    The scientifically selected packed seal multistage pump can achieve:

    Reduced failure rate: from mechanical seals 30%+ Drop to 5% The following;

    Operational and maintenance cost savings: Average annual reduction in downtime losses 25 Ten thousand yuan (according to 10 Tai Pump Calculation);

    Security and Compliance Assurance: Meets the continuous operation requirements for drainage systems stipulated in the "Regulations on Safe Production in Coal Mines."

    Case: A gold mine in Yunnan 2023 Replace the packing seal annually. MD After the series of pumps, the drainage system has been running continuously for over... 2000 Hours of operation without any downtime incidents caused by seal failure have been certified as a provincial-level safety benchmark case.

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    Application and Technical Advantages of Multistage Centrifugal Pumps in Coal Mine Drainage

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