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Corrosion-Resistant SH-Type Split-Casing Pump Selection Guide
Corrosion-Resistant SH-Type Split-Casing Pump Selection Guide
Absolutely! In fact, many power plants—especially those handling media with slight corrosive properties—often struggle when selecting pumps. That’s precisely where the corrosion-resistant SH-type split-case pump comes in as an exceptionally versatile choice. Below, we’ve put together a super practical selection guide to walk you through the process step by step, helping you make the right choice and avoid costly mistakes. The guide focuses on three key factors—operating conditions, materials, and parameters—making it easy for even beginners to get started:
The first step is to clearly identify the medium being conveyed—this is the core prerequisite (and the most critical factor) for pump selection. Before making your selection, you must first determine exactly what corrosive medium you’re dealing with: Is it a mild acid, alkali, or salt solution, or is it circulating water or wastewater containing trace amounts of corrosive components? The corrosivity of the medium directly determines the choice of materials for subsequent components. Additionally, pay attention to two key points: First, the temperature of the medium. Standard corrosion-resistant SH-type split-case pumps are suitable for media at temperatures up to 80°C under normal conditions. If the temperature exceeds this threshold, you’ll need to specify this in advance and select materials that are both high-temperature and corrosion-resistant. Second, consider the solid content and particle size of the medium. It’s easier to select a pump for a purely corrosive medium free of particles. However, if the medium contains particles such as silt or sand, you’ll need to choose a composite material that is both wear-resistant and corrosion-resistant to prevent rapid wear and corrosion of the impeller and pump casing.
Step 2: Choose the right corrosion-resistant material—avoid a one-size-fits-all approach and tailor your selection to the specific operating conditions. Different corrosion scenarios call for different materials; selecting the right one can significantly extend the pump’s service life, while choosing the wrong material may easily lead to leaks and damage. Here are some commonly recommended materials—select according to your needs: ① Mild corrosion (e.g., weakly corrosive circulating water in power plants): Choose 304 stainless steel. It offers high cost performance, meets basic corrosion resistance requirements, and is both economical and practical. ② Moderate corrosion (e.g., media containing weak acids or weak bases): Choose 316 stainless steel. It boasts stronger corrosion resistance and is suitable for most industrial corrosion environments. ③ Severe corrosion (e.g., chlorinated wastewater, strong acids or alkalis): Choose special materials such as duplex steel or Hastelloy alloys. These materials provide excellent resistance to chloride-ion corrosion and stress corrosion cracking, and also offer higher strength. ④ Slight corrosion plus particulate-containing media: Choose ductile iron (which has slightly better corrosion resistance than ordinary cast iron) or composite materials with tungsten carbide surface coatings. These materials strike a balance between wear resistance and corrosion resistance.
Step 3: Verify the flow rate and head parameters to ensure precise matching with the operating conditions—avoiding both over- and under-sizing. No matter what type of pump you’re using, selecting incorrect parameters will render the pump ineffective. The corrosion-resistant SH-type split-case pump boasts a wide range of flow rates and heads: its flow rate spans from 110 m³/h to 12,500 m³/h, and its head ranges from 10.6 meters to 140 meters, making it suitable for various applications such as power plants and chemical industries of different scales. When selecting a pump, pay attention to the following: The actual flow rate and head during operation should be slightly lower than the pump’s rated parameters (allowing a margin of 10%–15%) to prevent long-term operation at full load, which could accelerate corrosion and wear. Additionally, take into account the installation environment and confirm the flange standards for the pump’s inlet and outlet connections (such as ANSI or PN) to ensure proper installation compatibility.
[For more information on vertical double-suction split-case pump models, specifications, selection guidelines, and quotation options, please click the image above to learn more.]
Step 4: Pay close attention to the shaft seal and details to enhance corrosion resistance and stability. The shaft seal is critical for preventing medium leakage—especially in the case of corrosive media. Leakage not only contaminates the environment but can also damage the pump body. For corrosion-resistant SH-type split-case pumps, two types of shaft seals are available: ① Mechanical seal: This offers excellent sealing performance with minimal leakage, making it suitable for most corrosive environments. It is recommended as the preferred choice and can be paired with hard alloy sealing elements to further improve sealing effectiveness and corrosion resistance; ② Packing seal: This provides high cost-effectiveness and easy maintenance, making it ideal for mildly corrosive environments where leakage tolerance is relatively low. In addition, pay attention to the pump’s hydraulic design—prioritize impellers designed using advanced CFD technology. Such impellers offer high hydraulic efficiency while reducing medium erosion, slowing down the corrosion rate, and extending service life. As for the shaft sleeve, it is advisable to select a corrosion-resistant material that can be replaced at any time, thereby preventing corrosion and wear on the pump shaft.
Step 5: Consider all factors comprehensively—taking into account both the application scenario and cost—without making blind decisions. ① Prioritize scenarios with specific needs: For applications such as power plants, chemical industries, and water treatment facilities that involve the conveyance of corrosive media, if a power plant also has requirements for circulating water and water supply/drainage, prioritize selecting [the appropriate solution]. Corrosion-resistant SH-type split-case pump ① Highly versatile and easy to maintain; ② Cost control: In scenarios involving mild corrosion, there’s no need to blindly opt for expensive special materials—304 stainless steel can easily meet the requirements. In scenarios with severe corrosion, it’s recommended to go straight for high-quality materials such as duplex steel to avoid frequent pump replacements, which would otherwise increase long-term costs; ③ Manufacturer selection: Give priority to manufacturers that are qualified and have experience with similar application scenarios. They can customize materials and models according to your specific needs, ensuring better after-sales service and easier replacement of spare parts, thus avoiding selection errors caused by improper customization.
Finally, a quick reminder: When selecting a pump, be sure to provide the manufacturer with detailed parameters of the medium (corrosion intensity, temperature, solid content), actual operating conditions, and installation environment. This will prevent the manufacturer from configuring the pump based on standard clear-water pump specifications, which could result in inadequate corrosion resistance. By following the five steps outlined above, you can precisely select a suitable SH-type split-case corrosion-resistant pump that not only meets your operational requirements but also extends the pump’s service life and reduces maintenance costs—making it especially well-suited for applications such as power plants, where equipment stability is critical.
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