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Acid pump selection program
The following is a detailed guide on selecting acid pumps, covering various types of acids and the most suitable pump materials for each.
1. **Hydrochloric Acid Pumps**: Hydrochloric acid typically has a maximum concentration of 38%. For this, the pump's wetted parts can be made of plastic. However, considering long-term service life, cost-effectiveness, and performance, it's advisable to choose either an FSB fluorine alloy centrifugal pump or a CQB magnetic pump. These options offer excellent corrosion resistance and reliable operation at a reasonable price.
2. **Sulfuric Acid Pumps**: Sulfuric acid pumps are divided into two categories: dilute and concentrated. For dilute sulfuric acid, you can use engineering plastic pumps, ceramic pumps, or F46/F26 pumps. However, for concentrated sulfuric acid, only fluoroplastic (F46) pumps are recommended, as common engineering plastics will corrode quickly. Additionally, due to the high density of concentrated sulfuric acid, the pump motor should be sized appropriately. A simple rule of thumb is to multiply the shaft power by 1.84 to determine the required power for conveying concentrated sulfuric acid.
3. **Hydrofluoric Acid Pumps**: Hydrofluoric acid is extremely corrosive and requires special handling. It is strongly recommended to use a fluoroplastic magnetic pump. Also, any ceramic components in contact with hydrofluoric acid must be replaced with compatible materials to prevent damage.
4. **Nitric Acid Pumps**: For nitric acid, fluoroplastic magnetic pumps are also the best choice. To ensure good sealing performance, rubber seals should be replaced with PTFE materials, which offer better chemical resistance.
5. **Acetic Acid Pumps**: Acetic acid is one of the most corrosive organic acids. Ordinary steel will corrode severely at all concentrations and temperatures. Stainless steel, especially 316 stainless steel with molybdenum, is highly resistant to acetic acid and suitable for high-temperature and dilute acetic acid environments. For high-temperature, high-concentration acetic acid or other harsh conditions, consider using high-alloy stainless steel or CQB series fluoroplastic magnetic pumps, such as the CQ316L stainless steel magnetic pump.
6. **Salt Water (Seawater) Pumps**: In sodium chloride solutions or seawater, ordinary steel has a relatively low corrosion rate, so painting or coating is often sufficient for protection. While various stainless steels have low uniform corrosion rates, they may suffer from localized corrosion caused by chloride ions. 316 stainless steel is a good option, but it's more expensive. Alternatively, fluoroplastic centrifugal pumps like the IHF chemical centrifugal pump are a cost-effective and durable solution.
7. **Sealing Options**: Magnetic pumps feature a static seal, eliminating the need for dynamic sealing. Centrifugal pumps, on the other hand, typically use external bellows mechanical seals, which offer better corrosion and wear resistance. If the pumped medium contains particles, hard-to-hard mechanical seals are recommended for improved durability.
At Yixing Zeus Pump Co., Ltd., we specialize in providing high-quality acid-resistant pumps tailored to your specific application needs. We welcome the opportunity to collaborate with you and deliver reliable, long-lasting solutions. Let us help you make the best pump selection for your process!