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Deaerated Feedwater Pump

Publication Date:

2025-09-05

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In a thermal system or power plant, the deaerator feedwater pump is one of the key pieces of equipment, primarily responsible for supplying deionized water to the deaerator. Since the deaerator is a mixed-type heating device, it must be followed by a pump that boosts the pressure before the water enters the boiler—this pump is known as the feedwater pump. The feedwater pump takes the deoxygenated feedwater, which already has a specific temperature and has been treated to remove dissolved oxygen, raises its pressure, and then delivers it to the boiler. This ensures that the metal components of the boiler, steam turbine unit, and the entire system remain protected from excessive oxidation and corrosion even under high-temperature conditions. Additionally, the feedwater pump helps maintain the proper water level in the deaerator, thereby guaranteeing adequate water supply for the waste heat boiler and meeting the overall demand for boiler feedwater.

Oxygen-removal feedwater pump model

The DG-type multistage boiler feedwater deaerator pump is a horizontal, single-suction, multistage sectional centrifugal pump designed for conveying clean water and liquids with physical and chemical properties similar to water. It is ideally suited for supplying feedwater to medium- and low-pressure boilers, as well as for high-pressure water supply and drainage systems in industrial plants or urban areas. The pump can handle media temperatures ranging from -20°C to 160°C (with the maximum temperature not exceeding 105°C for medium-pressure applications), and its inlet is permitted to operate under pressures below 0.6 MPa. Thanks to its safe and stable operation, low noise levels, long service life, and ease of installation and maintenance, this pump is widely adopted across various industries, including power plants, metallurgy, and heating systems. Notably, both the inlet and outlet of the DG deaerator pump are positioned vertically upward. Tension bolts securely connect the pump’s suction section, middle section, and discharge section into a single unit. The pump rotor consists of components such as impellers and balance discs mounted directly onto the pump shaft. The entire rotor is supported by sliding bearings located at both ends of the pump shaft, while axial forces generated during operation are effectively balanced by the balance disc. Lubrication of the bearings is achieved through circulating lubricating oil, which is simultaneously cooled by a continuous flow of chilled water. As for sealing mechanisms, the pump typically features a soft packing seal. During operation, a small amount of the conveyed medium can be directed to the stuffing box area, or external cooling and lubrication water can be introduced to serve both as a water seal and for effective cooling and lubrication. Additionally, depending on user requirements, the soft packing seal can be easily replaced with a mechanical seal for enhanced performance and reliability.

↑Click the image to learn about the DG-type multi-stage boiler deaerator feedwater pump Product details and Price Information ↑

The DG(P)-type self-balancing multistage boiler high-pressure deaerator feedwater pump is primarily designed for conveying clean water or liquids with physical and chemical properties similar to water—specifically, those free of solid particles and operating at temperatures ranging from -20°C to 210°C. It is suitable for medium-, low-, and high-pressure feedwater applications. Innovatively reformed and redesigned from the traditional structural model, the energy-efficient DG(P)-type self-balancing deaerator feedwater pump eliminates the axial force balancing mechanism typically found in multistage centrifugal pumps, as well as the conventional balance disc assembly. As a result, it represents an upgraded, next-generation product compared to the D and DG series of multistage centrifugal pumps.

The DG(P)-type boiler feedwater deaerator pump, designed without a balancing device—specifically, it eliminates both the disc friction loss from the balance disc and the return flow loss from balancing water—achieves a pump efficiency that is 5 to 14% higher than comparable multistage pumps. By eliminating disc friction in the balance mechanism, the pump also reduces its shaft power consumption, resulting in significant energy savings. As a result, the pump consumes approximately 3% less electricity during operation compared to similar multistage pumps in the same category. Moreover, this design effectively addresses various common failures—such as wear on the balance disc and balance ring or rotor seizure—that typically arise when the balancing device fails, thereby extending the pump's service life. With trouble-free operation lasting more than three times longer than conventional pumps, users experience significantly reduced maintenance costs, ultimately lowering the overall lifecycle cost of the pump. Years of operational experience have demonstrated that this product delivers performance levels on par with advanced international counterparts. Additionally, the pump can be customized by modifying materials (and structural design), sealing configurations, and incorporating enhanced cooling systems, making it suitable for conveying hot water at temperatures ≥20°C, oils, corrosive fluids, or even abrasive media. Available material options include HT200, QT600, ZG, 304, 304L, 316L, 317L, 904L, CD4, and other specialized alloys tailored to meet diverse application needs.

↑Click the image to learn about the DG(P)-type self-balancing multi-stage boiler high-pressure deaerator feedwater pump Product details and Price Information ↑

The IH-type single-stage, single-suction stainless steel water pump is a cantilevered centrifugal pump featuring single-stage, single-suction (axial intake) design. It is designed to handle media with temperatures ranging from -20°C to 105°C, and when required, can be equipped with a double-end face seal cooling system, enabling it to transport media at temperatures between 20°C and 280°C. This pump is ideally suited for industries such as chemical processing, petroleum, metallurgy, power generation, papermaking, food production, pharmaceuticals, environmental protection, wastewater treatment, and synthetic fiber manufacturing—enabling the efficient transfer of various corrosive or non-contaminating liquids that resemble water. Its marking, rated performance, and dimensions are fully aligned with international standards, ensuring compatibility and reliability. The pump boasts a wide performance range, high efficiency, advanced "three standardization" levels, and convenient maintenance features. Notably, its efficiency is, on average, 5% higher than that of F-type pumps, making it a nationally promoted energy-saving product.