| Parameter | Specification |
| Product Name | D/DF/MD Horizontal Multistage Centrifugal Pump |
| Pump Type | Horizontal multistage centrifugal pump |
| Flow Rate | 25–850 m³/h |
| Head Range | 33–1056 m |
| Outlet Diameter | φ40–φ300 mm |
| Liquid Temperature | 0–80°C |
| Seal Options | Packing seal or mechanical seal |
| Installation Type | Horizontal installation |
| Pumped Media | Clean water, industrial water and compatible corrosive liquids |
| Main Applications | Municipal water supply and drainage, high-rise water supply, industrial drainage and irrigation |
Specific motor power, number of stages, rotational speed, pump material and seal configuration depend on the selected model and actual operating conditions.
The multistage hydraulic structure enables the pump to generate heads from 33 to 1056 meters.
Each impeller stage adds pressure to the liquid, making the pump suitable for:
The required number of stages is selected according to the design flow and total system head.
With flow capacities from 25 to 850 m³/h, the series can serve medium-sized building systems as well as large municipal and industrial water-transfer projects.
Corrosion-resistant configurations can be supplied for compatible chemically active liquids.
The material of the pump casing, impeller, shaft, shaft sleeve, guide vane and seal components should be selected according to:
Material compatibility must be confirmed before using the pump with corrosive liquids.
A packing seal provides a practical and economical sealing solution for many general water-transfer applications.
Its advantages include:
A small amount of leakage may be required to lubricate and cool the packing during operation.
A mechanical seal is available where lower visible leakage and improved sealing performance are required.
It is suitable for:
The seal-face and elastomer materials should be selected according to the liquid properties and operating temperature.
The horizontal configuration provides stable installation and convenient access to the motor, coupling, bearings, seals and pump body.
The multistage structure generates high pressure without requiring one oversized impeller.
Convenient Installation
The pump and motor can be installed on a common base and connected through a coupling.
The horizontal arrangement simplifies foundation construction, equipment alignment and pipeline connection.
Once correctly installed, filled and commissioned, the pump provides stable water delivery with straightforward operating procedures.
Valves, pressure gauges, flow instruments and automatic controls can be integrated according to the system requirements.
The sectional pump construction allows internal components to be dismantled for inspection and replacement.
Maintenance personnel can service:
This service-friendly design helps reduce maintenance difficulty and equipment downtime.
The D/DF/MD Multistage Centrifugal Pump can be used in municipal pumping stations and water-distribution systems.
Typical applications include:
The pumped liquid should be compatible with the selected pump material and hydraulic passage.
The pump’s high-head performance makes it suitable for transporting water to upper floors in high-rise residential, commercial and public buildings.
It can be used in:
The pump can be configured as a single unit or integrated into a multi-pump variable-frequency booster system.
The pump can be used for drainage and water transfer in factories, industrial parks, mines and production facilities.
Typical applications include:
For liquids containing corrosive components, a compatible material configuration should be selected.
The pump can supply pressurized water for parks, gardens, green spaces and large landscape-irrigation systems.
It is suitable for:
The high-head capability makes the pump suitable for moving water through long pipelines.
The total head calculation should include:
The pump can provide pressurized water for industrial processes and utility systems.
Applications may include equipment washing, cooling-water supply, process-water delivery and centralized factory water systems.
Depending on the selected pump model and material configuration, the D/DF/MD series can transport:
The pump should generally not be used without technical confirmation for:
The pump contains multiple impellers installed in series along one shaft.
Liquid enters the first-stage impeller and gains velocity and pressure. It then passes through a guide vane or return channel into the next impeller stage.
Each stage increases the pressure until the liquid reaches the final discharge outlet.
This hydraulic arrangement provides:
The actual number of stages depends on the required head and selected pump model.
The D/DF/MD series can be configured for different media and operating environments.
A standard configuration is suitable for clean water and other non-corrosive liquids with similar physical and chemical properties.
Typical applications include municipal water supply, building boosting and irrigation.
Corrosion-resistant wetted components can be selected for compatible acidic, alkaline or chemically active liquids.
The correct alloy and seal material should be selected after evaluating the medium composition and concentration.
For industrial drainage or demanding water-transfer duties, the pump can be configured according to the water quality, operating hours, pressure and installation environment.
The final model designation and component materials should be confirmed during technical selection.
The correct shaft-seal option depends on the pumped medium, system pressure, leakage requirements and maintenance conditions.
Choose a Packing Seal When:
For corrosive media, all seal-face materials, elastomers and metal components must be chemically compatible with the liquid.
Selecting the correct wetted-part material is essential when handling corrosive liquids.
The following information should be provided:
Possible materials depend on the pump model and may include suitable cast materials, stainless steels or corrosion-resistant alloys.
The statement that a pump can handle corrosive media does not mean that one material is suitable for every chemical liquid.
High-head pumping systems operate under significant internal and pipeline pressure.
The following components must be selected for the maximum expected pressure:
For multistage systems, water hammer and rapid pressure changes should also be considered.
The discharge valve should be opened and closed gradually according to the operating procedure.
The pump should be installed horizontally on a strong and level foundation.
The pump and motor shafts must be accurately aligned before startup. Poor alignment may cause vibration, bearing damage, seal leakage and coupling wear.
The suction pipeline should be short, direct and airtight.
Unnecessary bends, restrictions and sudden diameter changes should be avoided to reduce inlet losses.
The suction and discharge pipelines must be supported independently so that their weight is not transferred to the pump casing.
The pump should be protected from excessive pipeline stress and thermal expansion.
Pressure gauges should be installed on the suction and discharge sides where required.
Before startup, the pump casing and suction pipeline must be filled with liquid and properly vented.
Dry running must be avoided.
Before starting the pump:
1.Check the pump and motor alignment;
2.Confirm that all fasteners are secure;
3.Inspect bearing lubrication;
4.Fill the pump and suction pipeline with liquid;
5.Remove trapped air from the pump casing;
6.Open the suction valve;
7.Set the discharge valve according to the startup procedure;
8.Check the motor rotation direction;
9.Start the motor;
10.Gradually adjust the discharge valve;
11.Confirm stable flow and pressure;
12.Inspect the seal, bearings and coupling.
The motor current should remain within the rated operating range.
Regular inspection helps maintain stable pressure and efficient operation.
Recommended checks include:
Packing should not be tightened excessively because a small amount of leakage may be required for cooling and lubrication.
Mechanical seals should be inspected if leakage increases or abnormal heat develops around the seal chamber.
The D/DF/MD Horizontal Multistage Centrifugal Pump combines high-head performance, flexible material configurations and convenient maintenance.
Its multistage hydraulic design provides heads of up to 1056 meters, making it suitable for high-rise building water supply, municipal pumping stations, long-distance water transfer and industrial drainage.
Corrosion-resistant configurations can be selected for compatible chemically active liquids, while packing and mechanical-seal options allow the pump to meet different leakage-control and maintenance requirements.
The horizontal sectional structure is convenient to install, operate, dismantle and repair, helping reduce maintenance difficulty and equipment downtime.
With flow capacities from 25 to 850 m³/h and outlet sizes from φ40 to φ300 mm, the series provides a flexible high-pressure pumping solution for municipal, industrial and irrigation systems.
Please send us your required flow rate, head, pipeline information, liquid composition, temperature, material requirements, seal preference and power-supply details.
Our technical team will recommend a suitable D/DF/MD Horizontal Multistage Centrifugal Pump and provide detailed performance data, motor configuration, material options, dimensions and quotation.
D/DF/MD Horizontal Multistage Centrifugal Pump — A high-head and service-friendly solution for water supply, drainage, irrigation and corrosive-liquid transfer.
