Nitrous acid pump corrosion resistant material what can choose?

When choosing the nitrous acid pump model, correctly determine nitrite pump material is to guarantee the safe operation of the centrifugal pump and prolong the service life of pump is one of the most important factor. Select material to comprehensively consider the effect of various factors from several aspects, to select the most suitable material.

1) nature of the nitrous acid water pump transmission medium and the operating conditions of the pump, such as temperature, pressure, corrosion resistance, viscosity, whether or not containing solid particles, etc. Also have to consider any other special circumstances, such as medicine and food industry requirement conveying medium especially clean, prevent the pollution of metal ions, the pump requirements of transmission medium containing solid particles material good abrasion resistance, etc.

2. The mechanical properties of material should be suitable for the requirements of the pump. A lot of indicators reflect the material mechanical properties, the materials used in the pump, mainly considering the material strength, stiffness, hardness, plasticity, impact toughness and fatigue resistance, etc.

3. The processing technology of material performance and the pump is directly related to the manufacture and installation maintenance. The centrifugal Gao impeller, casing, balance disc, etc. Most of the parts are made of metal material casting, and machining process, some parts need to heat treatment. The stand or fall of material processing technology performance directly affects the use of materials and the cost of the pump.

4. Corrosion resistance of the stand or fall of important problem is the material choice of the water pump can not be ignored. For petroleum and chemical industry, the corrosion resistance of the pump is especially important.

common nitrous acid pump corrosion resistant materials selection

often encountered in the acid, alkali and petrochemical production base his liquid materials of metal material is corrosive, used for transporting materials in this class of centrifugal pump are collectively referred to as anti-corrosive centrifugal pump, the pump model are expressed in F, its working principle, similar to that of the centrifugal pump is its corrosion resistance is mainly determined by the material properties of manufacturing this kind of pump. The following table is a manufacturer of nitrous acid pump commonly used materials.

most corrosion resistant nitrous acid pump can corrosion mainly depends on the materials of the pump flow components for corrosion resistant pump, based on the transmission medium is different, choose the material of pump flow components. Table 3 - 1 the material only applies to certain kinds of corrosive medium, such as Cr18Ni9Ti can be used in the normal temperature of the low concentration of nitric acid and other weak oxidizing acid, alkali and corrosive medium ‍ OCr18Ni12M02Ti is suitable for the high concentration of nitrate transport under normal temperature, also can transport of sulfuric acid, organic acid, such as reducing medium ‍ ‍ of sulfuric acid grey cast iron HT200 is suitable for the plastic has a wide range of application, such as ptfe and fep with reasonable formula, mold, processing a variety of materials, corrosion resistant plastic pump with the advantages of a variety of plastic, provide superior corrosion resistance, and has high mechanical strength, not aging, without toxin decomposition characteristics, is an ideal equipment to transport all kinds of strong, weak acid, including ptfe is one of the good corrosion resistant material, basically can be resistant to any corrosion of acid, alkali medium, is called the king of plastic. Plastic has a wide application range, ptfe and polyvinyl perfluorinated through reasonable formula, mold, processing a variety of materials, corrosion resistant plastic pump has strong corrosion resistance, and has high mechanical strength, not aging, and the advantages of no decomposition, chemical pump, is an ideal equipment to transport all kinds of strong, weak acid, one of ptfe yes corrosion resistant material, pipe chemical pump, basically can be resistant to any corrosion of acid, alkali medium, self-priming chemical pump, is called the king of plastic. Ceramic, enamel, glass and so on also in certain occasions to make corrosion of the pump flow components.

high pure aluminum at room temperature nitric acid corrosion resistant performance is good, but the equipment of the weld is easy to appear problem, this is a lot of nitrate users often encounter problems. Special high silicon stainless steel in this several materials nitric acid corrosion resistant performance is the best, its corrosion resistance is superior to the high purity aluminum, high silicon, and high mechanical strength and machining performance is high purity aluminum and silicon are incomparable. The material price is more expensive, an investment is higher, but its corrosion resistance performance is good, long service life. Its good mechanical performance, high safety coefficient in use, convenient maintenance, etc. , can be done in the production of a parking or not less, raise the production efficiency of the whole production line.

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