Prior to selecting a chemical pump, we must comprehend and become experts in the fundamentals of chemical pump selection. The device flow, head, pressure, temperature, cavitation flow, suction range, and other process characteristics must be met by the chosen chemical pump type and performance. Meanwhile, the chemical pumps that are chosen must fulfill the criteria of the media characteristics. ①For conveying flammable, explosive toxic or rare media, chemical pumps are required to be equipped with reliable shaft seals or leak-free pumps, such as magnetic pumps and diaphragm pumps. ②It is necessary for convective components of pumps transporting corrosive media to be made of materials resistant to corrosion, such as stainless steel centrifugal pumps. ③The needs of convective components employing wear-resistant materials, and if necessary, the shaft seal with the use of clean liquid flushing, for pumps conveying fluid containing solid particles. When you are not sure how to choose the chemical pump according to the medium, you can consult our staff. We can recommend the right chemical pump for you according to the characteristics of the medium you provide. The following we introduce six common special media for reference when selecting chemical pumps.
1. Sulfuric Acid: The way that different temperatures and quantities of sulfuric acid cause materials to corrode varies significantly. Cast iron and carbon steel chemical pumps are the finest options for concentrated sulfuric acid with a concentration of more than 80% and a temperature of less than 80°C. While cast iron and carbon steel chemical pumps are more resistant to corrosion, they are not appropriate for moving sulfuric acid at a high rate of speed.
2. Hydrochloric Acid: Rubber lined pumps and plastic chemical pumps (such as polypropylene, fluorine plastic, etc.) are the best options for transporting hydrochloric acid since most non-metallic materials have strong corrosion resistance to hydrochloric acid.
3. Nitric Acid: It is one of the most corrosive organic acids. The stainless steel is an excellent acetic acid-resistant material for high concentrations and temperatures of acetic acid or other corrosive media. For extreme conditions, you can choose fluoroplastic chemical pumps or high-alloy stainless steel.
4. Alkali (sodium hydroxide): Regular stainless steel's resistance to lye corrosion offers no discernible benefits over cast iron, provided that the medium permits a tiny quantity of iron to be mixed in with the chemical. Otherwise, stainless steel is not advised.
5. Salt water: Common steel corrodes less quickly in sodium chloride solution and seawater, usually requiring coatings for protection. The uniform corrosion rate of all varieties of stainless steel is likewise extremely low. However, localized corrosion and chloride ions may be the reason, which is why the factory often utilizes 316 stainless steel chemical pumps.
6. Alcohols, ketones, esters, and ether: methanol, ethanol, ethylene glycol, propanol, and so on are examples of common alcohol media; acetone, butanone, and so on are examples of ketone media; methyl ester, ethyl ester, and so on are examples of ester media; and methyl ether, ethyl ether, butyl ether, and so on are examples of ether media. They are essentially non-corrosive, may be used to regularly used materials, and the specific chemical pump selection should also take into account the medium's qualities and associated needs in order to make an informed decision. In order to prevent errors in the selection of sealing materials, it is also important to keep in mind that ketone, ester, and ether on a variety of rubber solubility.
