Seeking professional selection samples

For a long time, corrosion has been one of the most troublesome hazards for chemical processing equipment; even the slightest carelessness can lead to equipment damage, and in severe cases, it can cause accidents or even trigger disasters. According to relevant statistics, about 60% of damage to chemical processing equipment is caused by corrosion; therefore, when selecting chemical pumps, it is essential to pay attention to the scientific choice of materials. There is a common misconception that stainless steel is a \"universal material\" that can be used in any medium or under any environmental conditions; this is very dangerous. Below are the key points for material selection regarding some commonly used chemical media (some models are tailored for the products manufactured by our company): 1. Sulfuric acid: As one of the highly corrosive media, sulfuric acid is an important industrial raw material with a wide range of applications. Sulfuric acid at different concentrations and temperatures causes varying degrees of corrosion to materials. For concentrated sulfuric acid with a concentration of over 80% and a temperature below 80°C, carbon steel and cast iron exhibit good corrosion resistance; however, it is not suitable for sulfuric acid that flows at high speeds, and thus cannot be used as material for pumps and valves ； Common stainless steels such as 304 (0Cr18Ni9) and 316 (0Cr18Ni12Mo2Ti) also have limited utility in sulfuric acid media. Therefore, pump valves for transporting sulfuric acid are usually made of high-silicon cast iron (which is difficult to cast and process) or highly alloyed stainless steel (grade 20 alloy), but their difficulty in processing and high cost mean they are not favored. Fluoroplastic alloys exhibit excellent resistance to sulfuric acid. They are patented materials developed by the Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences; our company acquired this patented technology in 1985 and was the first to use it to develop and produce corrosion-resistant chemical pumps. Experiments conducted by the Chinese Academy of Sciences have shown that no chemical medium within the applicable temperature range is known to react with these materials. Therefore, using fluorinated pump materials (F46) represents a more economical choice. The company’s applicable products include: CQB fluoroplastic magnetic pumps, IMD fluorine-lined magnetic pumps, IHF fluorine-lined centrifugal pumps, FSB fluoropolymer alloy centrifugal pumps, etc. 2. Hydrochloric acid: The vast majority of metal materials are not resistant to corrosion by hydrochloric acid (including various stainless steel materials); high-molybdenum high-silicon iron can only be used in hydrochloric acid at temperatures below 50°C and with a concentration of less than 30%. Unlike metal materials, the vast majority of non-metallic materials exhibit good corrosion resistance to hydrochloric acid; therefore, rubber-lined pumps and plastic pumps (such as engineering plastics and fluoroplastics) are the best choices for transporting hydrochloric acid. The company’s applicable products include: CQB fluoroplastic magnetic pumps, IMD fluorine-lined magnetic pumps, IHF fluorine-lined centrifugal pumps, FSB fluoropolymer alloy centrifugal pumps, UHB polyethylene centrifugal pumps, and more. 3. Nitric acid: Most metals are rapidly corroded and damaged by nitric acid. Stainless steel is the most widely used material resistant to nitric acid, exhibiting good corrosion resistance against nitric acid of all concentrations at room temperature. It is worth noting that stainless steels containing molybdenum (such as 316 and 316L) do not have better corrosion resistance to nitric acid than ordinary stainless steels (such as 304 and 321); in some cases, their resistance is even lower. For high-temperature nitric acid, fluoroplastic alloy materials are typically used. The company’s applicable products include: CQB fluoroplastic magnetic pumps, IMD fluorine-lined magnetic pumps, IHF fluorine-lined centrifugal pumps, FSB fluoropolymer alloy centrifugal pumps, etc. 4. Acetic acid: It is one of the most corrosive organic acids; ordinary steel suffers severe corrosion in acetic acid at all concentrations and temperatures. Stainless steel is an excellent material resistant to acetic acid, and 316 stainless steel containing molybdenum can also be used in high-temperature environments as well as with dilute acetic acid vapor. For demanding applications such as high-temperature, high-concentration acetic acid or environments containing other corrosive substances, high-alloy stainless steel or fluoroplastic pumps can be used. Such as CQB fluoroplastic magnetic pumps, IMD fluorine-lined magnetic pumps, IHF fluorine-lined centrifugal pumps, FSB fluoropolymer alloy centrifugal pumps, etc. 5. Bases (sodium hydroxide): Their corrosive strength is generally not very high, but crystallization occurs in most alkaline solutions; therefore, IHF fluorocarbon-lined centrifugal pumps equipped with mechanical seals made of siliconized graphite material 169, or FSB fluoropolymer alloy centrifugal pumps, can be used. 6. Ammonia (ammonium hydroxide): Most metals and non-metals suffer only mild corrosion in liquid ammonia and ammonia water (ammonium hydroxide); only copper and its alloys are not suitable for use. Most of the company’s products are suitable for transporting ammonia and ammonia water. Fluoroplastic magnetic pumps and fluoroplastic centrifugal pumps can both be used stably for a long time. 7. Saltwater (seawater): Ordinary steel experiences a low rate of corrosion in sodium chloride solutions as well as in seawater and brackish water; coating protection is generally required ； Various types of stainless steel also have very low uniform corrosion rates, but local corrosion may occur due to chloride ions; therefore, 316 stainless steel is generally the better choice. All types of chemical pumps manufactured by the company are suitable for use. 8. Alcohols, alkanes, esters, ethers: Common alcohol-based media include methanol, ethanol, ethylene glycol, propanol, etc.; alkanes include propane, butane, etc.; ester-based media comprise various methyl esters, ethyl esters, etc.; ether-based media include dimethyl ether, diethyl ether, butyl ether, etc. These substances generally have low corrosivity, so ordinary stainless steel can be used for them. However, a proper choice should still be made based on the properties of the medium and relevant requirements. It is also worth noting that alcohols, esters, and ethers are soluble in various rubbers, which helps to avoid mistakes when selecting sealing materials. There are many other materials that cannot be listed here one by one. In short, when selecting materials, one should not act casually or blindly; it is advisable to consult relevant information, draw on proven experience, or contact our company for advice.

When selecting materials, one must not act casually or blindly; instead, it is necessary to consult relevant information and draw on proven experience

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It is important to first decide which centrifugal pump from that brand you need, and then purposefully seek out the sample models for selection. Pumps from different manufacturers are not the same and cannot be used interchangeably.

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