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Corrosion- and Wear-Resistant Centrifugal Pump

Publication Date:

2025-09-05

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In industries such as nonferrous metal smelting, building materials, environmental protection (including desulfurization and flue gas treatment), and coal chemical engineering, centrifugal pumps are frequently used to handle abrasive or corrosive solid-liquid two-phase flows. In addition to the general performance characteristics of pumps, corrosion- and wear-resistant centrifugal pumps must also meet the stringent requirements imposed by the unique properties of the media being conveyed—for instance, many of these media contain sulfuric acid, hydrochloric acid, hydrofluoric acid, metallic ions, or substances with a pH range of 5 to 6. Therefore, the pump must exhibit excellent corrosion resistance and reliable sealing performance. Meanwhile, certain media have high concentrations, and near the bottom wall, the random velocity distribution of particles tends to be lower on average compared to regions farther from the bottom—potentially leading to clogging. Thus, the impact of medium concentration on pump performance needs to be carefully considered. Additionally, some liquid media contain solid particles that can easily erode and wear down flow passages, necessitating careful attention to the pump’s design and material selection to minimize wear rates. Furthermore, for certain media operating at temperatures between 65°C and 85°C, the influence of temperature on pump performance must also be taken into account.

Metal-based impeller components in centrifugal pumps often fail to achieve ideal service life. By using composite wear- and corrosion-resistant materials, significantly improved durability can be attained. The most common composite materials for this purpose include duplex stainless steel and fluoroplastics. Centrifugal pumps manufactured with these advanced composites exhibit superior wear and corrosion resistance, making them highly effective in demanding applications.

Stainless Steel Corrosion-Resistant and Wear-Resistant Centrifugal Pump Models

The AFB-type horizontal single-stage centrifugal wear- and corrosion-resistant pump is a single-stage, single-suction, cantilevered corrosion-resistant centrifugal pump. It features an advanced hydraulic model, a novel structural design, and a high-strength, combined single or double mechanical seal. The pump’s wetted components—those in direct contact with the conveyed medium—are made of stainless steel 1Cr18Ni9Ti, offering advantages such as high efficiency, energy savings, compact structure, stable performance, and reliable operation. This pump is suitable for conveying non-solid particle-containing, corrosive liquids, with the medium temperature ranging from -40°C to 105°C. Additionally, when equipped with a dual-mechanical-seal cooling system, it can handle high-temperature media up to 300°C.

The DF-type stainless steel wear-resistant and corrosion-resistant chemical centrifugal pump is a horizontal, single-suction multistage, sectionalized corrosion-resistant chemical pump. It is designed for conveying non-corrosive liquids free of solid particles, with operating temperatures ranging from -20°C to 105°C and an allowable inlet pressure of up to 0.6 MPa. This pump boasts high efficiency, a wide performance range, safe and stable operation, low noise levels, extended service life, and convenient installation and maintenance. It is suitable for transferring clean water or other liquids with physical and chemical properties similar to water. Additionally, by modifying the material of the pump’s wetted components, altering the sealing configuration, or adding a cooling system, it can also be used to handle hot water, oils, corrosive fluids, or media containing abrasive particles.

The DFP-type self-balancing stainless steel corrosion- and wear-resistant pump is a single-suction, multistage, sectional-style corrosion-resistant centrifugal pump designed for conveying corrosive liquids free of solid particles, with temperatures below 80°C. The pump’s inlet can handle pressures up to less than 0.6 MPa. It features advanced sealing technologies: a labyrinth seal at the front end and a magnetic seal at the rear, ensuring a secure pump body design with highly reliable mechanical sealing performance. During pump startup and shutdown, the rotor components experience no axial movement, and there are no axial pulsations during operation—effectively addressing the longstanding challenges of poor mechanical seal reliability and frequent leakage issues plaguing nitric acid pumps. Equipped with a self-balancing mechanism and constructed from high-quality, corrosion-resistant stainless steel casting, this pump boasts exceptional sealing performance, superior efficiency, and remarkable energy savings. It also delivers outstanding practicality, economic benefits, seamless fault-free operation, and significantly reduced maintenance costs. As such, it represents an excellent next-generation upgrade over traditional multistage centrifugal pumps featuring balance disc designs.

DFP-Type Self-Balancing Stainless Steel Corrosion-Resistant and Wear-Resistant Pump

The S, SH, and SA models are single-stage, stainless steel, split-case, corrosion- and wear-resistant centrifugal pumps designed for horizontal installation. The flow passage components are made entirely of cast iron; however, if required by the user, the impellers can also be manufactured from cast steel or brass. By adjusting materials, seals, and structural designs, these pumps can be tailored to handle media such as highly abrasive, muddy water, or fluids requiring exceptional corrosion resistance—or even oil-based substances. These pumps are ideal for conveying clean water as well as liquids with physical and chemical properties similar to water, including mildly corrosive liquids (with maximum liquid temperatures not exceeding 80°C). They are perfectly suited for applications in industrial plants, mines, urban areas, power stations, agricultural drainage and irrigation systems, and various hydraulic engineering projects.

S, SH, and SA Type Single-Stage Stainless Steel Split-Casing Corrosion-Resistant and Wear-Resistant Centrifugal Pump

Fluoroplastic Wear-Resistant and Corrosion-Resistant Centrifugal Pump Models

The FSB series horizontal explosion-proof fluoroplastic alloy pump is designed for wear and corrosion resistance, enabling long-term operation under temperatures ranging from -80°C to 150°C while reliably handling corrosive media of various concentrations—such as acids, bases, salts, and strong oxidizing agents. The pump’s casing and all flow components are entirely constructed from F46 fluoroplastic alloy, combining the superior properties of multiple fluoropolymers. This material delivers exceptional corrosion resistance, coupled with high mechanical strength, excellent aging resistance, and the added benefit of being free from toxic decomposition. Featuring robust mechanical integrity, the FSB pump boasts a well-optimized design, compact structure, and dependable performance, making it both easy to use and simple to maintain. Its smooth internal flow passages ensure high efficiency. Equipped with a state-of-the-art external-mounted PTFE bellows mechanical seal, the FSB pump offers multi-layered protection, significantly extending the seal’s service life. For applications involving media containing abrasive particles or solid impurities, users can opt for a single-end hard-to-hard (silicon carbide against silicon carbide) mechanical seal without cooling water. However, when selecting this type of seal, users should carefully consider the solid content present in the medium.

FSB Series Horizontal Explosion-Proof Fluoroplastic Alloy Wear-Resistant and Corrosion-Resistant Pump

The IH-type fluoroplastic corrosion- and wear-resistant centrifugal pump is a single-stage, single-suction, cantilevered fluoroplastic centrifugal pump. The pump body features a metal casing lined with perfluoroalkoxy alkane (F46), while the pump cover, impeller, and shaft sleeve are all integrally sintered and molded from fluoroplastic materials encased around metallic inserts. The shaft seal employs an advanced externally mounted bellows mechanical seal, with the stationary ring made of 99.9% alumina ceramic (or silicon nitride) and the rotating ring crafted from PTFE-filled material, ensuring exceptional corrosion and wear resistance. Both the pump’s inlet and outlet are reinforced with cast steel components, significantly enhancing the pump’s pressure resistance. Practical applications demonstrate that this pump boasts outstanding features such as superior corrosion and wear resistance, high-temperature tolerance, excellent anti-aging performance, exceptional mechanical strength, smooth operation, an advanced and highly rational design, reliable sealing capabilities, convenient disassembly for maintenance, and an exceptionally long service life. The IH-type wear- and corrosion-resistant pump is ideally suited for conveying corrosive liquids with viscosity similar to water in chemical processes. Typically, the temperature range of the conveyed medium falls between -20°C and 120°C; however, with appropriate cooling measures, the medium’s temperature can even exceed 200°C under certain conditions. Developed on the foundation of traditional fluoroplastic centrifugal pumps, the IH-type model represents a cutting-edge, highly corrosion-resistant centrifugal pump. What sets this pump apart from other acid-resistant pumps is its unparalleled ability to withstand not only strong acids—such as hydrofluoric acid, fuming sulfuric acid, nitric acid, and fluosilicic acid—but also strong bases, chloride ions, organic solvents, and potent oxidizing agents, properties that no other material-based pump can match.