Acid pump selection has always been one of the most troublesome chemical practitioners, a slight carelessness, ranging from damage to equipment, while causing accidents even lead to disaster. Xiaobian come and introduce the essentials of acid pump selection. Acid pump According to statistics, about 60% of the destruction of chemical equipment is caused due to corrosion, so in chemical pump selection, we must first pay attention to the scientific material selection. There is often a misunderstanding that stainless steel is a "universal material," no matter what the media and environmental conditions are held out of stainless steel, which is very dangerous. Horizontal acid pump, is the most widely used acid delivery pump. Followed by submerged pump is the use of more pumps, some manufacturers to solve the problem of not good horizontal pump seal, liquid habitual use of submerged pump. The following for some common chemical media talk about the selection of the main points. 1. Sulfuric acid as a strong corrosive medium, sulfuric acid is an important use of a wide range of industrial raw materials. Different concentrations and temperatures of sulfuric acid on the corrosion of materials vary greatly, for the concentration of more than 80%, the temperature is less than 80 ℃ of concentrated sulfuric acid, carbon steel and cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid, Not suitable for pump valve material; common stainless steel such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) sulfuric acid medium is also limited use. Therefore, the delivery of sulfuric acid pump valve is usually made of high silicon cast iron (casting and processing difficult), high alloy stainless steel (No. 20 alloy) manufacturing, but its processing is difficult and expensive, so people are not optimistic. Fluoroplastic alloy centrifugal pump has very good resistance to sulfuric acid. It is a patented material of Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences. It has been proved by the Chinese Academy of Sciences that there is no chemical medium to react with it. Therefore, fluorine plastic alloy (F46) ) Is a more economical option. Applicable products: IHF lining pump, FSB strong corrosion-resistant centrifugal pump, CQB fluorine plastic magnetic pump. 2. Hydrochloric acid solution Most of the metal materials are not resistant to hydrochloric acid corrosion (including a variety of stainless steel), molybdenum high ferrosilicon can only be used for 50 ℃, 30% hydrochloric acid. In contrast to metallic materials, the vast majority of non-metallic materials have good corrosion resistance to hydrochloric acid, so lined rubber pumps and plastic pumps (such as engineering plastics, fluoroplastics, etc.) are the best choice for the delivery of hydrochloric acid. Applicable products: CQB fluorine plastic leak-free acid pump, CQF engineering plastic magnetic pump (or fluorine plastic magnetic pump) and so on. 3. Nitric acid Most metals are mostly corrosive in nitric acid corrosion damage, stainless steel is the most widely used nitric acid-resistant materials, all concentrations of nitric acid at room temperature have good corrosion resistance, it is worth mentioning that the molybdenum-containing stainless steel (such as 316,316 L) corrosion resistance to nitric acid is not only not superior to ordinary stainless steel (such as 304,321), and sometimes even worse. For high temperature nitric acid, usually using fluorine plastic alloy material. Applicable products: IHF fluorine plastic alloy magnetic pump, FSB fluorine alloy centrifugal pumps. 4. Acetic acid It is one of the most corrosive substances in organic acids. Ordinary steel will be seriously corroded in all concentrations and temperatures of acetic acid. Stainless steel is an excellent acetic acid-resistant material. Molybdenum-containing 316 stainless steel is also suitable for high temperature and Dilute acetic acid steam. For high temperature and high concentration of acetic acid or other corrosive media containing harsh requirements, the choice of high-alloy stainless steel or fluorine plastic pump. Production of CQB magnetic pump, FZB Fluoroplastic self-priming pump. 5. Alkali (sodium hydroxide) Generally corrosive is not very strong, but the general alkaline solution will have a crystal, so the optional configuration of graphite 169 material mechanical seal IHF type fluorine alloy alkaline pump. 6. Ammonia (ammonia hydroxide) Most metals and non-metals in liquid ammonia and ammonia (ammonia hydroxide) corrosion are minor, only copper and copper alloy should not be used. Most products are suitable for ammonia and ammonia transport, CQF engineering plastic magnetic pump, FSB fluorine alloy centrifugal pump is better. 7. Saline (seawater) Common steel corrosion rate in sodium chloride solution and seawater, salt water is not too high, the general shall be used paint protection; various types of stainless steel also have a low uniform corrosion rate, but may be due to chloride ions caused by the local Corrosion, usually 316 stainless steel is better. Various types of chemical pumps have 316 material configuration, such as IH chemical centrifugal pump. 8. alcohols, ketones, esters, ethers Common alcohol mediums are methanol, ethanol, ethylene glycol, propanol, ketones have acetone, butanone and so on, the ester medium has a variety of methyl esters, Ethyl ether, ethers medium ether, ether, butyl ether, their basic corrosive is not strong, so you can use ordinary stainless steel, the specific selection should also be based on the media properties and related requirements to make a reasonable choice. It is also noteworthy that ketones, esters, ethers are soluble in a variety of rubber, sealing materials in the choice of avoiding mistakes, it is recommended to choose inorganic seal fluorine plastic magnetic pump. Further Reading: pump valve pipe fittings Exhibition Water Expo Xiamen exhibition of marine equipment Internet + Forum Yiwu Fair 2016 exhibition mold top ten brands of the Internet information industry (Xiamen) Technology Co., Ltd. Author: Asian pumps Network Editor: Yao Xiaoxia (QQ / WeChat:) http://beng.liuti.cn/ (Service Hotline:)
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