The selection of the acid pump model is the most critical issue in the chemical industry. If the wrong model is select, It will damage the machinery and equipment in light, and It will cause safety accidents or even disasters in severe cases.
According to relevant statistical analysis, about 60% of the damage to chemical machinery and equipment is caused by corrosion. Therefore, when choosing a chemical pump model, the first thing to pay attention to is the rationality of the corresponding liquid.
Many companies mistakenly use stainless steel pumps for almost all liquid transfer scenarios, and stainless steel is used regardless of material and environmental conditions. This is a huge mistake, and even severe safety accidents will occur. Next, for some of the more common chemical acid-base liquids, the essential elements of the following selections are explained:
1. Transmission of nitric acid: The use of metal materials will not corrode and damage in a short time. Stainless steel is the most widely nitric acid-resistant material and has good corrosion resistance to all nitric acid Normal temperature concentrations. One thing to note is that corrosion resistance molybdenum-containing stainless steels (AS316 and 316L) are sometimes better. For high-temperature nitric acid, fluoroplastic alloy materials are generally used. Our products are High Temperature and Cryogenic Horizontal Stainless Steel Centrifugal Pump, AS Stainless Steel Centrifugal Pump.
2. Acetic acid transmission: Acetic acid is one of the most corrosive substances in organic acids. It will severely erode general metal materials in acetic acid of any concentration value and temperature. Stainless steel is an excellent sour acid-resistant material. Molybdenum-containing 316 stainless steel also Can be applied to high temperature and dilute acetic acid steam. High-alloy stainless steel or fluoroplastic pumps can be used for harsh requirements such as high-temperature, high-concentration acetic acid, or other corrosive substances. For this acid, our targeted products are MD PVDF magnetic drive pump, MDH PVDF magnetic drive pump, BT PVDF vertical pump, PTH PVDF vertical pump, PD PVDF self-priming pump.
3. Transfer alkali: alkaline water (sodium hydroxide) is generally not very corrosive, but alkali solutions usually form crystals. You can use a long-shaft horizontal centrifugal pump equipped with a mechanical seal made of siliconized graphite 169.
4. Transporting ammonia water: Most ammonia (ammonium hydroxide) is slightly corroded in liquid ammonia and ammonia (ammonium hydroxide). In addition, you can not use copper materials. Most DUBAO products are ideal for the transportation of ammonia and ammonia water. Therefore: MD PP magnetic pump, MDH PP magnetic pump, PD PP Plastic self-priming pump are the most suitable.
5. Transfer salt water: Saltwater (Seawater) usually has a relatively low corrosion rate of sodium chloride solution, seawater, and saltwater and is generally protected by coatings; stainless steel corrosion rate is shallow, but chloride ions may cause local corrosion, typically 316 stainless steel. Various chemical pumps are available in 316 material configurations, such as SUS MD magnetic drive pumps.
6. Common alcohols, ketones, esters, esters, ethers, etc., in methanol, ethanol, ethylene glycol, propanol, ketone, acetone, methyl ethyl ketone, ester, methyl ether, ether, ether, etc., various rubbers, and errors are avoided in selecting sealing materials. It is recommended to choose MD non-shaft seal magnetic drive pump.
7. As one of the corrosive solid substances, sulfuric acid is an important industrial raw material widely used. The concentration of concentrated sulfuric acid is above 80 °C, and the temperature is below. One thing to note, esters and ethers are soluble at 80°C. High carbon steel and cast iron have better corrosion resistance, but they are not suitable for high-speed flowing sulfuric acid and are not ideal for pump valve materials. Generally, stainless steel such as 304 (Cr18Ni9) and 316 (0Cr18Ni12Mo2Ti) is also limited. Therefore, the sulfuric acid pump is usually made of high-silicon cast iron (difficult to process) and high-alloy stainless steel (20 alloys). Still, it isn't easy to operate and expensive, and people do not favor it. The fluoroplastic alloy centrifugal pump has good sulfuric acid resistance. The applicable products are MD sulfuric acid magnetic drive pump, MDH sulfuric acid magnetic drive pump, and PTH MD sulfuric acid vertical pump.
8. Most metal materials are resistant to hydrochloric acid corrosion (including stainless steel materials), and molybdenum-containing ferrosilicon can only be used at 50°C and below 30%. Unlike metal materials, most 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 choices for delivering hydrochloric acid. Applicable products are MDH hydrochloric acid magnetic drive pumps and MD HCL magnetic drive pumps.
I believe that the above eight points have already explained how to select the acid pump in the transmission of acid and alkaline liquids. Welcome to contact us; DUBAO is very happy to help.
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