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China Suppliers Factory: D-Type Single-Suction Multistage Centrifugal Pump & DG-Type Boiler Feed Pump
D-type Single-Suction Multistage Centrifugal Pump
⚡ High Efficiency & Energy Saving
Utilising advanced hydraulic model design, the flow channels of the impeller and guide vanes have been optimised to effectively reduce hydraulic losses and improve pump operating efficiency. Compared to traditional centrifugal pumps, energy consumption can be reduced under the same operating conditions, resulting in significant long-term savings in electricity costs for users.
📐 Compact Structure
Featuring a single-suction, multi-stage, segmented design, the pump's impellers are arranged in series, with a rational overall layout that minimises floor space requirements, making it ideal for installation in facilities or equipment rooms with limited space.
🔩 Stable Operation
The shaft system has excellent rigidity, and the rotor components undergo precise dynamic balancing calibration, ensuring low vibration and noise levels during operation. This guarantees stable performance during long-term continuous operation and reduces the risk of failures caused by equipment vibration.
🌐 Wide Application Range
Suitable for pumping clean water and liquids with physical and chemical properties similar to clean water, with a temperature not exceeding 80°C. Applicable to mine drainage, urban water supply and drainage, industrial circulating water systems, and agricultural irrigation.
DG Type Single Suction Multistage Boiler Feed Pump
🌡️ Excellent High-Temperature Performance
The pump's flow components are made of high-temperature resistant materials, such as alloy steel for the impeller and pump shaft, which can withstand the erosion and corrosion of high-temperature liquids. It can transport clean water or mildly corrosive liquids with temperatures not exceeding 160°C – 210°C.
🛡️ Safe & Reliable Operation
Equipped with a complete shaft sealing device, typically using mechanical seals, which offer excellent sealing performance and effectively prevent high-temperature liquid leakage. The pump's bearings use forced lubrication or cooling methods to ensure they do not overheat and fail under high-temperature conditions.
💧 Efficient & Stable Water Supply
Designed specifically for boiler feedwater systems, it provides stable head and flow output, ensuring continuous and uniform water supply to the boiler. This prevents fluctuations in water volume from affecting boiler operation, thereby ensuring safe and efficient boiler operation.
🔧 Rational Structural Design
The pump adopts a single-suction, multi-stage, segmented structure with symmetrically arranged impellers in each stage, balancing axial forces, reducing bearing loads, and extending the pump's service life. Inlet and outlet are both vertically oriented, facilitating connection with boiler feedwater pipelines.
D-type Single-Suction Multistage Centrifugal Pump — Performance Parameters
| Parameter | Range / Value |
|---|---|
| Flow Rate Range | 5 m³/h – 300 m³/h, covering continuous low-flow delivery to medium-flow batch delivery |
| Head Range | 50 m – 600 m, accommodating fluid delivery needs at different heights and distances |
| Motor Power | 5.5 kW – 250 kW, matched according to flow and head parameters to ensure efficient operation |
DG Type Single Suction Multistage Boiler Feed Pump — Performance Parameters
| Parameter | Range / Value |
|---|---|
| Flow Rate Range | 10 m³/h – 400 m³/h, meeting the feedwater requirements of boilers of various tonnages |
| Head Range | 100 m – 1000 m, precisely matching the required head based on boiler operating pressure and feedwater height |
| Motor Power | 15 kW – 400 kW, providing powerful support for stable operation under high-temperature and high-pressure conditions |
D-type Single-Suction Multistage Centrifugal Pump — Working Principle
The D-type single-suction multistage centrifugal pump consists of multiple impellers connected in series. The liquid enters the first-stage impeller from the suction chamber. Under the centrifugal force generated by the high-speed rotation of the impeller, the liquid is flung toward the outer edge of the impeller and enters the guide vanes. The guide vanes convert the kinetic energy of the liquid into pressure energy and guide the liquid into the next stage impeller. Through this sequential pressure-increasing process across multiple stages of impellers, the liquid is ultimately discharged from the pump outlet at a high pressure, enabling high-head fluid transportation.
DG Type Single Suction Multistage Boiler Feed Pump — Working Principle
The operating principle of the DG-type single-suction multi-stage boiler feedwater pump is similar to that of the D-type, both achieving liquid transportation through the serial connection of multiple impellers for pressure enhancement. The key difference lies in its design, which is specifically optimised for handling high-temperature media. Liquid enters the first stage impeller through the pump's suction inlet, is pressurised by the impeller, and then flows into the diffuser. The diffuser converts part of the kinetic energy into pressure energy and guides the liquid into the next stage impeller. Through continuous pressurisation by multiple stages of impellers, the liquid achieves sufficient pressure and is ultimately delivered to the boiler, meeting the boiler's requirements for feedwater pressure and flow rate.
Application Scenarios — D-type Single-Suction Multistage Centrifugal Pump
- Mining Industry: Used for underground drainage, slurry transportation in ore dressing plants (requires replacement of flow component materials), etc.
- Municipal Sector: Pressurised water supply in urban waterworks, sewage lifting in sewage treatment plants, etc.
- Industrial Production: Factory circulating cooling water systems, process water transportation, etc.
- Agricultural Sector: Large-scale farm irrigation projects, water diversion and drainage at water conservancy hubs, etc.
Application Scenarios — DG Type Single Suction Multistage Boiler Feed Pump
- Power Industry: Boiler feedwater systems in thermal power plants, providing high-pressure, high-temperature feedwater to boilers.
- Industrial Boilers: Steam boiler feedwater for various industrial enterprises (such as chemical, textile, and paper industries), ensuring normal boiler operation.
- Heating Systems: Boiler feedwater for district heating boiler rooms, meeting the water demand of heating boilers.
When selecting a D-type single-suction multistage centrifugal pump or a DG-type single-suction multistage boiler feedwater pump, the following factors should be considered:
🧪 Properties of the Conveyed Medium
Including medium name, temperature, viscosity, corrosiveness, and solid content. If conveying high-temperature liquids for boiler feedwater, the DG-type is the preferred choice; if conveying room-temperature clean water or similar liquids, the D-type is the appropriate choice.
📊 Flow Rate & Head Requirements
Based on the actual flow rate of the liquid to be transported and the required head in production, refer to the pump's performance parameter table to select a model that meets the operational requirements.
🏗️ Installation Conditions
Consider the size of the installation space, pipeline layout, inlet/outlet pipe diameters, etc., to ensure that the pump's installation dimensions match the on-site conditions.
🌍 Operating Environment
Consider the size of the installation space, pipe layout, inlet and outlet pipe diameters, etc., to ensure that the pump installation dimensions match the site conditions.
It is recommended to consult with a professional pump equipment supplier before selecting a model, providing detailed operating conditions parameters to obtain more precise selection recommendations, ensuring the selected equipment can operate efficiently and stably.
🔍 Daily Inspection
Regularly check whether the inlet and outlet pressure and flow rate of the pump are normal, whether the motor current and temperature are within the specified range, whether there are any leaks in the pump body and pipes, and whether the temperature and vibration of the bearing parts are in good condition.
🛢️ Lubrication Maintenance
According to the requirements of the equipment manual, regularly add or replace lubricating oil (grease) for the bearings to ensure good bearing lubrication and reduce wear.
🔒 Seal Maintenance
Inspect the leakage rate of the mechanical seal. If the leakage rate exceeds the specified value, promptly replace the seal components to prevent medium leakage from causing damage or affecting pump operation.
⚙️ Impeller & Guide Vanes Inspection
Regularly disassemble the pump housing to inspect the wear and corrosion of flow components such as the impeller and guide vanes. If any damage is found, promptly repair or replace the components to avoid performance degradation.
▶️ Regular Test Runs
For standby pumps, regular test runs should be conducted to ensure they can be put into use at any time when needed. During test runs, check whether the pump's starting performance and operational sounds are normal.
✅ Through scientific and reasonable maintenance and care, the service life of the pump can be effectively extended, the operational reliability of the equipment improved, the incidence of faults reduced, and the smooth progress of production ensured.
Q
What is the difference between a D-type centrifugal pump and a DG-type boiler feed pump?
The D-type single-suction multistage centrifugal pump is designed for general water supply, drainage, and industrial applications, handling clean water or similar liquids at temperatures not exceeding 80°C. The DG-type boiler feed pump is specifically engineered for high-temperature feedwater applications, using alloy steel components to handle liquids up to 160°C–210°C, and is optimised for the precise pressure and flow requirements of boiler systems.
Q
How do I select the correct pump model for my application?
Selection should be based on four key factors: the properties of the conveyed medium (temperature, viscosity, corrosiveness), the required flow rate and head, the installation conditions (available space, pipe layout, inlet/outlet diameters), and the operating environment. It is recommended to consult a professional pump supplier with detailed operating condition parameters to obtain precise selection guidance.
Q
What is the maximum temperature that the DG-type boiler feed pump can handle?
The DG-type single-suction multistage boiler feed pump can transport clean water or mildly corrosive liquids with temperatures not exceeding 160°C–210°C, depending on the specific model and configuration. Its flow components are made of high-temperature resistant alloy steel materials to withstand the erosion and corrosion of high-temperature liquids.
Q
How often should the mechanical seal be inspected and replaced?
The mechanical seal should be inspected regularly as part of routine maintenance. If the leakage rate exceeds the specified value outlined in the equipment manual, the seal components should be replaced promptly. For high-temperature applications such as the DG-type pump, more frequent inspections are recommended due to the demanding operating conditions.
Q
What industries are D-type multistage centrifugal pumps most commonly used in?
D-type single-suction multistage centrifugal pumps are widely used across multiple industries, including the mining industry (underground drainage, ore dressing slurry transport), the municipal sector (urban waterworks, sewage treatment), industrial production (circulating cooling water, process water), and agriculture (large-scale irrigation, water conservancy drainage).
Q
What maintenance steps are essential to extend the service life of these pumps?
Key maintenance steps include: daily inspection of pressure, flow rate, motor current, and temperature; regular lubrication of bearings according to the equipment manual; timely inspection and replacement of mechanical seals; periodic disassembly and inspection of impellers and guide vanes for wear or corrosion; and conducting regular test runs for standby pumps to ensure readiness. Consistent and scientific maintenance significantly extends pump service life and reduces failure rates.