| Parameter | Specification |
| Product Name | MDK Self-Balancing Multistage Split-Casing Pump |
| Pump Type | Horizontal multistage split-casing centrifugal pump |
| Flow Rate | 110–12,500 m³/h |
| Head Range | 10–220 m |
| Connection Diameter | 80–800 mm |
| Power Range | 7.5–2000 kW |
| Drive Options | Electric motor or diesel engine |
| Hydraulic Design | Three-dimensional flow theory with CFD optimization |
| Axial-Force Control | Self-balancing structure |
| Main Applications | Coal-mine drainage, municipal water supply and seawater desalination |
Specific speed, number of stages, motor power, materials and installation dimensions depend on the selected model and actual operating conditions.
The MDK pump uses a self-balancing hydraulic arrangement to control axial forces generated during multistage operation.
Unlike many conventional multistage pumps, the MDK series does not rely on a small-clearance balance disc.
Eliminating the traditional balance-disc structure provides several practical advantages:
The final suitability depends on the particle content, corrosiveness and other characteristics of the pumped liquid.
The pump contains multiple impellers arranged in stages.
Each stage increases the liquid pressure, allowing the pump to provide heads from 10 to 220 meters while maintaining large flow capacities.
This makes the MDK series suitable for deep-mine drainage, long-distance water transportation and large pressurized water-supply systems.
The split-casing design provides convenient access to internal pump components.
During inspection or maintenance, the pump casing can be opened without completely removing the suction and discharge pipelines in suitable installation arrangements.
This structure helps simplify:
The pump structure is designed to provide a practical arrangement of hydraulic, rotating and supporting components.
The accessible construction reduces maintenance difficulty and supports faster inspection and repair.
The hydraulic passage is designed using three-dimensional flow theory.
The geometry of the impellers, guide vanes and internal flow passages is optimized to improve energy conversion and reduce unnecessary hydraulic losses.
Computational fluid dynamics is used to analyze and optimize the internal flow field.
CFD simulation helps evaluate:
This optimization supports efficient and stable operation across a wide performance range.
The optimized multistage hydraulic design provides high operating efficiency when the pump is selected close to the required duty point.
Improved efficiency can reduce power consumption and lifecycle operating costs in continuously operated pumping stations.
The MDK pump is designed to maintain good efficiency across a relatively wide operating range.
This characteristic is useful in systems where flow demand or operating water levels change during service.
A broad efficient range can also help reduce excessive energy consumption when the pump does not operate continuously at one fixed duty point.
The inlet and impeller design are optimized to improve suction performance and reduce cavitation risk under suitable inlet conditions.
Good cavitation performance helps support:
The available NPSH and actual suction conditions must still be verified during pump selection.
The pump shaft uses a thickened and strengthened design.
The increased shaft rigidity helps reduce deflection during operation and supports stable alignment of the rotating components.
This provides:
The reinforced shaft, optimized hydraulic components and rational rotor arrangement help reduce vibration during operation.
Low vibration supports reliable bearing and seal performance and helps extend equipment service life.
The pump can be configured with an electric motor or diesel engine.
An electric-motor drive is suitable for permanent pumping stations with a stable electrical supply.
A diesel-engine drive is useful for:
The MDK Self-Balancing Multistage Split-Casing Pump is suitable for large-scale drainage in coal mines and underground mining projects.
Typical applications include:
The multistage structure provides the pressure required to lift water from underground levels to the surface or to a higher drainage stage.
The elimination of the conventional small-clearance balance disc makes the pump more suitable for demanding mine-water conditions than many traditional multistage designs.
The MDK pump can be used in municipal pumping stations and large water-distribution systems.
Typical applications include:
Its large flow range allows the pump to serve medium and large municipal systems.
The pump can be applied in seawater-desalination facilities for compatible intake, transfer, circulation and treated-water delivery duties.
Possible applications include:
For seawater and high-chloride media, wetted-part materials, seals and fasteners must be selected according to the actual chloride concentration, temperature and process conditions.
The MDK series is also suitable for large industrial facilities requiring continuous water transportation.
Applications may include:
The large flow and multistage head capability make the pump suitable for long-distance pipelines.
Pipeline diameter, elevation difference, friction loss and required terminal pressure should be included in the system-head calculation.
A diesel-engine-driven MDK pump can be used as an emergency or backup unit.
It can continue operating during electrical outages or in locations where a permanent power supply is unavailable.
Depending on the selected material configuration, the MDK pump may be used for transporting:
The pumped liquid should be evaluated for:
Material and seal selection should be confirmed before the pump is used with seawater, corrosive water or liquids containing suspended particles.
Traditional multistage pumps often use a balance disc to offset the axial thrust generated by the impellers.
The balance disc operates with a relatively small internal clearance. When the pumped medium contains particles, scale or contaminants, this narrow clearance may be affected by wear, blockage or increased leakage.
The MDK self-balancing design removes the need for the conventional small-clearance balance disc.
This provides several advantages:
This design is particularly beneficial in mine drainage and other applications where water quality may be more complex than standard clean-water service.
The split pump casing allows maintenance personnel to access major internal components more conveniently.
Depending on the model and installation arrangement, inspections can often be performed without dismantling the complete pipeline system.
Benefits include:
Adequate lifting and maintenance space should be reserved around the pump during station design.
Energy consumption is an important consideration for large pumps operating continuously.
The MDK hydraulic components are developed using three-dimensional flow design and CFD simulation to improve internal flow conditions.
The optimized design helps:
The greatest energy-saving benefit is achieved when the selected pump duty point is close to the recommended operating region.
Cavitation can occur when the pressure at the pump inlet falls below the vapor pressure of the liquid.
It may cause noise, vibration, reduced performance and damage to the impeller.
The MDK pump is designed with good cavitation characteristics, but the installation must still provide adequate inlet conditions.
The following factors should be considered:
The suction pipeline should be correctly sized and arranged to provide stable flow into the pump.
An electric-motor-driven pump is recommended for permanent installations with a reliable power supply.
The electric drive can be configured with:
The motor voltage, frequency, protection class and insulation requirements should be selected according to the project location and operating environment.
A diesel-engine-driven pump is suitable for emergency, standby or off-grid applications.
The configuration may include:
For emergency drainage, the diesel engine can be configured to start automatically when the water level rises or when the main electrical pumping system fails.
The pump should be installed on a strong, level foundation designed for the total weight and operating loads of the pump and drive unit.
The pump and motor or diesel engine must be correctly aligned before operation.
The suction pipeline should be short, direct and airtight. Unnecessary elbows and restrictions should be avoided.
The suction and discharge pipelines must be independently supported so that their weight is not transferred to the pump casing.
Adequate maintenance and lifting space should be provided around the split casing.
Before startup, the pump casing and suction system should be correctly filled and vented according to the installation arrangement.
The pump should not be operated dry.
For large-power units, foundation vibration, coupling alignment, pipeline forces and thermal expansion should be evaluated during system design.
Large MDK pump units may be equipped with:
The final monitoring configuration should match the pump power, operating importance and project requirements.
Regular inspection helps maintain efficient and reliable operation.
Recommended checks include:
The split-casing structure provides convenient access during planned overhauls.
Operating the pump within its recommended high-efficiency range can reduce vibration, energy consumption and mechanical wear.
The MDK pump combines large flow capacity, multistage high-head performance and a reliable self-balancing structure.
Its design eliminates the traditional small-clearance balance disc, making the pump more suitable for demanding media and operating environments than many conventional multistage pumps.
Three-dimensional flow design and CFD optimization provide high efficiency, a wide high-efficiency operating region and good cavitation performance.
The reinforced shaft supports smooth and reliable operation, while the split-casing construction simplifies inspection and maintenance.
With flow capacities up to 12,500 m³/h, heads up to 220 meters and power options up to 2000 kW, the MDK series is suitable for large coal-mine drainage systems, municipal water-supply projects and seawater-desalination facilities.
Electric-motor and diesel-engine drive options provide flexible solutions for permanent, emergency and remote pumping stations.
Please send us your required flow rate, head, pipeline information, suction conditions, medium composition, material requirements, drive type and control requirements.
Our technical team will recommend a suitable MDK Self-Balancing Multistage Split-Casing Pump and provide detailed performance data, drive configuration, dimensions, material options and quotation.
MDK Self-Balancing Multistage Split-Casing Pump — A high-efficiency and reliable solution for large-flow, high-head water-transfer systems.
