The oil and chemical industry occupies a very important position in the national economy, and the chemical process pump, as a key supporting equipment, has attracted more and more attention. Due to the complex characteristics of chemical mediators and the continuous improvement of environmental protection requirements, as chemical manufacturers, how should we choose the chemical pumps and focus on what aspects should be paid attention to is particularly important. Combined with the characteristics of most chemical companies, we briefly review the selection of commonly used chemical pumps, hoping to benefit our customers in this field.
Corrosion resistance
All the time, corrosion is one of the most headache of chemical equipment, a little inadvertent, light damage equipment, heavy cause accident even cause disaster. According to the relevant statistics, about 60% of the damage of chemical equipment are caused by corrosion. Therefore, the scientific nature of material selection should be paid attention to in selecting chemical pumps. There is usually a misconception that stainless steel is a universal material. It is dangerous to hold stainless steel in any medium and environment. The following points for some commonly used chemical media to talk about the selection of materials:
As one of the strong corrosion medium, 1. sulfuric acid is an important industrial raw material which is very widely used. Corrosion difference of different concentration and temperature of sulfuric acid material is large, the sulfuric acid concentration is above 80%, the temperature less than 80 DEG C, carbon steel and cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid, not suitable for ordinary stainless steel valve materials; such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) the sulfuric acid also of limited use. Therefore, the valve for transporting sulphuric acid is usually made of high silicon cast iron (hard casting and processing) and high alloy stainless steel (No. 20 alloy), but its processing is difficult and expensive, so it is not valued by people. Fluorine plastic alloy with good resistance to sulfuric acid good performance, it is Chinese Academy of Sciences, Shanghai Institute of organic chemistry, the patent materials, my company in 1985 the introduction of patented technology, first with the development and production of corrosion-resistant chemical pumps, proved by the Chinese Academy of Sciences, yet which can react with the chemical medium, so using fluorine pump (F46) is a more economical choice. The products are: IHF fluorine pump, FSB strong corrosion resistant centrifugal pump, IMD fluoroplastic magnetic pump, and so on.
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