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

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    煤矿井下专用水泵

    Publication Date:

    2025-09-05

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    In the coal mining and selection process, an indispensable piece of equipment is the general mechanical equipment — water pump. Due to the complex environment in coal mining, more than one type of water pump is used. In this article, the mine pump manufacturer Changsha Zhonglian Pump Industry , will focus on introducing the types and selection points of special water pumps for underground coal mines. It is believed that this will help you better understand coal mine water pumps.

     

    WeChat Image_20220301094047

    Please click the image to learn about various 【mine drainage pump】 model parameters and product details from Changsha Zhonglian Pump Industry.

     

    1. Core selection basis and specification requirements

    1. Drainage capacity calculation

    According to the "Coal Mine Safety Regulations" and related national standards, the water pump selection must meet the following capacity requirements:

    Total capacity of working water pumps: must discharge the normal 24-hour inflow of the mine within 20 hours.

    Backup pump capacity: not less than 70% of the working pump, and the total capacity of working + backup pumps should discharge the maximum 24-hour inflow within 20 hours.

    Maintenance pump capacity: not less than 25% of the working pump.

    Special cases: For mines with complex hydrogeology or risk of sudden water inrush, reserved positions for additional pumps or installation of disaster-resistant submersible pump systems are required.

     

    2. Water tank capacity matching

    Effective capacity formula for main water tank: $ V=2(Q+3000) $ (Q is the normal inflow, unit m³/h), and desilting must be completed before the rainy season.

     

    3. Head and resistance calculation

    Consider pipeline sedimentation resistance (resistance coefficient taken as 1.7), and verify motor capacity matching during initial operation. The head design should cover vertical height, pipeline loss, and safety margin.

     

    2. Water pump type selection and applicable scenarios

    1. Recommended pump types for main drainage system

    Horizontal multistage centrifugal pumps (such as MD, MDS types): suitable for conventional main drainage, high efficiency (above 77%), strong wear resistance, capable of handling water with particles.

     

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    Please click the image to learn about various 【mine multistage centrifugal pumps】 model parameters and product details from Changsha Zhonglian Pump Industry.

     

    Self-balancing multistage centrifugal pumps (such as MDP type): use axial force self-balancing technology to reduce seal wear, extend maintenance cycle by over 30%, with high head and large flow performance range, suitable for mine underground water drainage, can be paired with intelligent control system to achieve data monitoring and unattended operation functions.

     

    WeChat Image_20220301094036

    Please click the image to learn about various 【self-balancing mine multistage pumps】 model parameters and product details from Changsha Zhonglian Pump Industry.

     

    2. Special environment selection

    Explosion-proof submersible pumps (such as BQS type): used in high gas concentration or emergency drainage, with IPx8 protection level, low motor temperature rise, supporting full head overload-free operation.

     

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    Please click the image to learn about various 【BQS type mine explosion-proof submersible pumps】 model parameters and product details from Zhonglian Pump Industry.

     

    Pneumatic diaphragm pumps: used for sewage discharge or mixed water transport in high gas areas, no electric power needed, excellent explosion-proof performance.

    Acid-resistant pumps (such as DF type): for acidic water with pH<5, stainless steel impellers or epoxy resin coated pump bodies are required.

     

    IMG20241210110519

    Please click the image to learn about various 【DF type corrosion-resistant mine multistage pumps】 model parameters and details from Zhonglian Pump Industry.

     

    3. Auxiliary scenario pump types

    Bottom sump drainage: preferred mine submersible pumps, single unit capacity must discharge 24-hour accumulated water within 20 hours.

    Drilling drainage: use seamless steel pipe pipelines, paired with high head centrifugal pumps.

     

    3. Safety standards and explosion-proof certification

    1. Mandatory certification

    Must select drainage pumps that have obtained the " Coal Mine Safety Mark (MA certification)".

    Explosion-proof grade must comply with GB/T3836 series standards, explosion-proof enclosure with "d" protection, cable flame retardancy meets MT818.5-2009.

     

    2. Pump room safety design

    Dual circuit power supply, if one circuit fails, the other can bear the full load.

    Pump room must have two exits, leading respectively to the shaft and the bottom car station, with waterproof and fireproof sealed doors installed in the passage.

    Rotating parts must have protective covers, equipped with anti-vibration bases and water hammer elimination devices.

     

    4. Maintenance and system support

    1. Maintenance strategy

    Regular maintenance: Check seals and lubricate bearings quarterly, and replace wear parts during annual overhaul.

    Monitoring maintenance: Install temperature sensors (PT100) to monitor shaft temperature and pressure sensors to prevent dry running.

     

    2. Pipeline and power supply support

    The main drainage pipe must have both working and standby pipelines, and all pipelines must be capable of handling the maximum inflow.

    Power supply equipment capacity must support all pumps running simultaneously; when motor power exceeds 100kW, the pump room must be equipped with a lifting beam.

     

    3. Disaster resistance system design

    High-risk water inrush mines should be equipped with disaster-resistant submersible pump systems, with drainage capacity ≥ maximum inflow, preferably using a primary direct discharge to surface scheme.

    Pipeline layout should select wall thickness in sections, with intermediate straight pipe supports installed every 100-150m in the shaft.

    By following the above steps, pump selection can meet safety standards while achieving efficient and economical operation, providing reliable assurance for the underground mine drainage system.

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