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Lubrication: During the operation of a slurry pump, the possible intrusion of the conveyed medium, water, and other substances into the oil tank may affect the pump's normal operation. Therefore, it is necessary to check the quality and oil level of the lubricant frequently. The quality of the lubricant can be observed with the naked eye and analyzed by regular sampling. The amount of lubricating oil can be seen from the oil level mark. For a new pump, the oil should be changed once after one week of operation. For a pump with replaced bearings during overhaul, the oil should also be changed. Because foreign substances enter the oil during the running-in of the new bearings and shafts, the oil must be changed. Thereafter, the oil should be changed once every quarter. The lubricating grease and lubricating oil used for chemical pumps should meet quality requirements. Tables 2-8 and 2-9 show the commonly used lubricating grease and lubricating oil for slurry pumps. Vibration: During the operation of the pump, due to reasons such as poor quality of spare parts and maintenance, improper operation, or pipeline vibration, vibration often occurs. If the vibration exceeds the allowable value, the pump should be shut down for maintenance to prevent damage to the machine. Table 2-10 shows the allowable range of vibration values for slurry pumps. Bearing temperature rise: During the operation of the pump, if the bearing temperature rises rapidly and after the temperature rise stabilizes, the bearing temperature is too high, which indicates that there are problems in the manufacturing or installation quality of the bearing; or the quality, quantity, or lubrication method of the bearing lubricating oil (grease) does not meet the requirements. If not dealt with in time, the bearing is in danger of being burned out. The allowable temperature for slurry pump bearings is <65°C for sliding bearings; and <70°C for rolling bearings. This allowable value refers to the allowable range of bearing temperature after running for a period of time. For a newly replaced bearing, at the initial stage of operation, the bearing temperature will rise relatively high. After running for a period of time, the temperature will drop somewhat and stabilize at a certain value. The operating performance of slurry pump: During the operation of the pump, if there is no change in the liquid source and the opening degree of the valves on the inlet and outlet pipelines remains unchanged, but the flow rate or inlet and outlet pressure changes, it indicates that there is a fault in the pump or pipeline. The cause should be quickly identified and eliminated in time, otherwise, adverse consequences will be caused. The size of the system resistance can be achieved by adjusting the opening degree of the inlet and outlet valves of the pump. For a determined pump system, when the outlet valve is fully opened, the system resistance is the smallest, and the corresponding flow rate is the largest, the head is the smallest, and the power is the largest. When the outlet valve is completely closed, the system resistance reaches a maximum value. At this time, the flow rate is zero, the head is the largest (a finite value), and the power is the smallest. From this, the following points can be summarized: When starting a slurry pump, in order to avoid overloading the prime mover, the outlet valve should be closed first and then opened slowly after the pump is started. In this way, it can avoid the superposition of the large starting load of the prime mover and the high power required by the pump when the outlet valve is fully opened, which may cause overloading of the prime mover. As long as the pump chamber is filled with liquid (to avoid dry friction of the sealing ring, shaft seal, etc.), the slurry pump is allowed to operate for a short time when the outlet valve is closed. Except for the rapid temperature rise of the limited liquid in the pump chamber under the action of the rotating impeller, which has some adverse effects on the pump, there is no adverse effect on the prime mover. At this time, the load on the prime mover is the lightest. During operation, any set of flow rates and heads within the performance range of the slurry pump can be obtained by adjusting the opening degree of the outlet valve. However, when the pump operates at the design operating point, its efficiency is the highest; the farther away from the design operating point, the lower the efficiency. Unit sound: The sounds emitted by the pump during operation are some normal and some abnormal. For abnormal sounds, find out the cause and eliminate it in time. The following are roughly the reasons for the abnormal sounds of the pump. Reasons on the fluid side: For example, insufficient inlet flow of the slurry pump causes cavitation and emits noise; air accumulation in the pump outlet pipeline causes water hammer and emits an impact sound. Reasons on the mechanical side: The bearing quality does not meet the requirements or is damaged; the clearance between the moving and stationary parts of the pump is inappropriate, causing friction; shaft bending causes internal friction; parts are damaged and fall off; foreign objects fall into the pump, etc.   For details of the first part, please refer to the previous blog post.

  The following is the first part of the daily operation and maintenance of slurry pumps： tart-up and shutdown： Preparations Before Start-up： Check whether the connecting bolts and foundation bolts of the pump are loose. Check whether the piping connection is proper and whether the centers of the pump and the driver are aligned. For pumps handling high-temperature or low-temperature liquids, the expansion and contraction of the piping may cause shaft misalignment, seizure, etc. Therefore, flexible pipe joints, etc., should be used. Direct coupling and alignment. For small-sized pumps handling normal-temperature liquids, there is no problem in aligning the pump and the motor when the pump is stopped. However, for large-sized pumps handling high-temperature liquids, there is a large difference in the shaft center during operation and stoppage. To achieve correct alignment, generally heat to the operating temperature or stop the pump after the operation and quickly re-align to ensure that the shaft centers of both rotating parts are the same and avoid vibration and pump seizure. Clean the piping. Before operation, the piping must be cleaned first to remove foreign objects, welding slag, etc. from the piping. Do not let foreign objects or welding slag fall into the pump body. Install pressure gauges before and after the strainer in the suction pipe to monitor the clogging of the strainer during operation. Barring. Remove the coupling before start-up, turn the rotor by hand to observe whether there are any abnormal phenomena, and conduct a separate test run of the motor to check whether its rotation direction is the same as that of the pump. By rotating the coupling by hand, it can be found whether there are foreign objects between the impeller and the casing inside the pump. The barring should be even in weight, and there should be no abnormal noise inside the pump. Start the oil pump and check whether the bearing lubrication is good. Priming the pump. Fill the pump chamber with liquid before start-up to discharge air, liquefied gas, and steam from the suction pipe and the pump body. Start-up： The idle operation must be avoided. At the same time, open the suction valve, and close the discharge valve and each discharge hole. Open the cooling water supply valve for the bearings. If the stuffing box has a water jacket, open the cooling water supply valve of the stuffing box. If the pump handling high-temperature liquid has not reached the working temperature, open the preheating valve, and close this valve after the pump is preheated. If the pump is equipped with a liquid-sealing device, open the valve of the liquid-sealing system. If equipped with an overheating device, open the bypass valve of the self-circulation system. Start the motor. When the pump flow increases and overheating is no longer possible, close the valve of the self-circulation system. If the pump must be started with the check valve closed and the outlet gate valve open, the start-up steps are basically the same as the above method, except that the outlet gate valve should be opened for a period of time before the motor is started. Gradually open the discharge valve. Shutdown： Open the valve on the self-circulation system. Close the discharge valve. Stop the motor. If it is necessary to maintain the working temperature of the pump, open the preheating valve. Close the cooling water supply valves of the bearings and the stuffing box. If liquid-sealing is not required during the shutdown, close the liquid-sealing valve. If it is a special pump device requirement or when the pump is opened for inspection, close the suction valve, and open the vent hole and various discharge holes. Usually, the start-up and shutdown steps specified for turbine-driven pumps are basically the same as those for motor-driven pumps. Turbines have discharge valves, various drain holes, and sealing devices, which must be opened or closed before and after operation. In addition, turbines generally require preheating before start-up. Some turbines in the system are required to be started at any time, so barring operation is required. Therefore, the operator should operate according to the relevant regulations on the start-up and shutdown steps of the turbine provided by the turbine manufacturer. Maintenance During Shutdown For standby pumps at the chemical plant site, when the in-use pump fails, they should be able to be switched over in time and put into normal operation to ensure that the chemical production process is not interrupted. This requires the maintenance of the standby pumps to keep them in good condition during the standby and shutdown period. Especially for standby pumps with interlock and automatic switching, their inlet and outlet valves are open, and the pumps are filled with the medium to be transported. As long as the driver rotates, they can start working immediately. For standby pumps during the shutdown period, the quality and quantity of the lubricant should be checked frequently. The pump body and the medium inside the pump that needs to be heated and insulated should be heated and insulated. To prevent the rotor from bending due to its own weight and to prevent the shaft from adhering to the bearings and causing start-up difficulties, the standby pumps should be barring regularly. For pumps that have been shut down for a long time, open the plugs on the pump body to drain the liquid inside the pump to avoid damage to the pump body due to cold weather. If necessary, open the pump body, clean the internal parts, and apply anti-rust oil. For pumps that have been shut down for a long time, whether they are on-site or in the warehouse, they should be barring regularly. For details of the first part, please refer to the next blog post.

Determine the basic parameters: Flow requirement: Determine the required flow rate of the submersible pump according to the treatment scale and sewage transport volume of the sewage treatment plant. Calculate the amount of sewage to be discharged per hour, and select an appropriate - flow submersible wastewater pump based on this. If there is a need for drainage volume adjustment, the flow variation range under different working conditions also needs to be considered. Head requirement: Measure the vertical height difference from the installation position of the submersible pump to the discharge point, and add factors such as pipeline friction losses and local losses to determine the required head. Ensure that the pump's head can meet the requirement of smoothly transporting sewage to the designated position. Consider the characteristics of the medium: Sewage composition: Analyze whether the sewage contains solid particles, fibers, corrosive substances, etc. If there are more solid particles in the sewage, a submersible pump with good flow - passing ability and anti - clogging performance should be selected. Its impeller should be able to effectively pass a certain multiple of the fiber material of the pump diameter and a large proportion of solid particles. For sewage containing corrosive components, the material of the pump should have corresponding corrosion resistance, such as using stainless steel, engineering plastics and other materials. Temperature range: Understand the temperature of the sewage to ensure that the submersible pump can work normally at this temperature. Some special sewage treatment processes may generate high - temperature sewage. At this time, a chemical resistant submersible pump that can withstand high temperature and chemical corrosion needs to be selected.     Concentration and viscosity: The concentration and viscosity of sewage will also affect the selection of submersible pumps. High - concentration and high - viscosity sewage require pumps with strong transport capacity and motor - carrying capacity, and the price of such submersible pumps will be relatively high.   Evaluate the installation environment:   Submerged depth: Measure the installation depth of the submersible pump in the sewage tank or treatment facility to ensure that the submerged length of the selected pump can meet the requirements. Generally, the submerged depth of the submersible pump has a certain range limit, and an appropriate model needs to be selected according to the actual situation, such as a submersible water pump for well.For example submersible corrosion-resistant pumps.   Space limitation: The spatial layout of the sewage treatment plant may be relatively compact, so the installation space of the submersible pump needs to be considered. Selecting a compact - structured and small - volume submersible water pump can save installation space and facilitate maintenance and inspection.   Surrounding facilities: Check whether there are other equipment or obstacles around the installation position of the submersible pump to ensure that the installation and operation of the pump will not be affected. At the same time, consider the impact of the pump's vibration and noise on the surrounding environment.   Select reliable brands and suppliers:   Product quality: Select submersible pump manufacturers with good product quality and high reliability, which can provide good after - sales service. Information such as word - of - mouth in the industry and user reviews can be referred to.   Supplier's qualifications: The supplier should have good reputation and qualifications, and be able to provide formal product sales and after - sales service. Check the supplier's business license, production license and other relevant certificates to understand its production capacity and technical level.   After - sales service: The submersible pump may malfunction or require maintenance during use, so the supplier's after - sales service is crucial. Ensure that the supplier can provide timely technical support, repair service and spare parts supply.

     First, it is necessary to have a detailed understanding of the chemical substances that need to be transported in the chemical plant. This includes information such as the name, chemical formula, concentration, and pH value of the chemical substances. At the same time, it is also necessary to consider whether the chemical substances are oxidizing, reducing, or containing solid particles.      Second, according to the properties of the chemical substances, select appropriate pump body, impeller, and sealing materials. Generally, a ptfe centrifugal pump can be chosen. Its pump body is lined with fluoroplastic (polytetrafluoroethylene). Or a PTFE centrifugal pump can be selected. Its pump body is lined with PTFE. For sealing materials, when transporting organic solvents, mechanical seals can be used. The sealing surface materials can be selected as silicon carbide-silicon carbide (SiC-SiC) pairing. This material combination has good wear resistance and chemical corrosion resistance and can effectively prevent organic solvent leakage.      Third, according to the flow and head requirements calculated according to the production process requirements of the chemical plant, select the appropriate model from the product catalog of the manufacturer of chemical corrosion-resistant centrifugal pumps. For example, the CYH Series Stainless Steel Chemical Centrifugal Pump produced by Anhui Changyu Pump Valve Manufacturing Co., Ltd. is a chemical corrosion-resistant centrifugal pump. Its flow and head range can meet the requirements of various chemical productions. Its rated performance points and overall dimensions are marked in accordance with the international standard IS02858-1975(E). It is an energy-saving product that replaces F-type corrosion-resistant pumps.      Finally, consider the transportation temperature and system pressure of chemical substances. Some materials may lose their corrosion resistance at high temperatures. At this time, it is necessary to select a centrifugal pump that is both high-temperature resistant and corrosion-resistant. For example, the CYF Series Fluoroplastic Centrifugal Pump produced by Anhui Changyu Pump Valve Manufacturing Co., Ltd. is a chemical corrosion-resistant centrifugal pump. Its flow and head range can meet the requirements of various chemical productions. It can continuously transport strong corrosive media such as sulfuric acid, hydrochloric acid, hydrofluoric acid, nitric acid, aqua regia, strong alkali, strong oxidant, organic solvent, and reducing agent of any concentration at a temperature range of -85°C to 200°C.          

The wearing parts are the most vulnerable parts of the slurry pump. During use, repair and maintenance, special care is required for the wearing parts. UHB slurry pump is a cantilever single-stage single-suction centrifugal pump, which is specially designed and developed for conveying corrosive media containing fine particles. The pump is made of steel-lined ultra-high molecular weight polyethylene, which is a new generation of corrosion-resistant and wear-resistant engineering plastics for pumps. Its outstanding advantage is that it has excellent wear resistance, impact resistance, creep resistance and excellent corrosion resistance among all plastics. So what are the vulnerable parts of a pump and what should be paid attention to? The pump casing of the slurry pump is generally a cast iron part, and the special pump has an inner lining material, which is prone to cracks under the action of mechanical force or thermal stress. When the slurry pump is impacted by cavitation during work or frozen in winter without draining the accumulated water in the pump casing, it is also prone to rupture. If the damage is serious and cannot be repaired, a new pump casing should be replaced The pump shaft of the slurry pump is generally a carbon steel part, but it is also easily damaged due to manufacturing quality, use or installation. The pump shaft may crack, fold, wear the journal, damage the thread, etc., and may also break. If the damage is serious and cannot be repaired, a new shaft should be replaced. The impeller is an important working part of the slurry pump and is made of cast iron. It is also easily damaged due to manufacturing quality and use. The impeller may crack, and the surface may form holes or perforations due to cavitation. The blades may become thinner or wear unevenly due to long-term grinding, or even be crushed by debris. Some defects can be repaired; some defects cannot be repaired, that is, a new impeller should be replaced. The bearing bush of the sliding bearing is generally cast from copper-tin alloy, which has poor wear resistance and is one of the vulnerable parts that are easy to wear and burn out. The bearing bush can generally be repaired (repair) or replaced with a new one. slurry pump manufacturer slurry pump is suitable for non-ferrous metal smelting industry: especially for various acid liquids, corrosive ore slurry, slurry (for filter press), electrolyte, sewage and other media transportation in wet smelting of lead, zinc, gold, silver, copper, manganese, cobalt, rare earth, etc. The chemical slurry pump is a pump that can adapt to various working conditions, such as conveying acid, alkaline clear liquid or slurry; various corrosive slurries in the smelting industry; various dilute acids in the sulfuric acid industry; various sewage in the environmental protection industry, etc. The pump is both corrosion-resistant and wear-resistant, and has a wide range of uses. The average service life of rolling bearings is generally 5,000 hours, but improper installation, long service time or poor maintenance can also cause wear or damage. Except for individual parts of rolling bearings that can be replaced with new ones, the entire part must generally be replaced.      The mouth ring is also called the leakage reduction or wear reduction ring. It is one of the parts that are easily worn in the slurry pump. It can be repaired or replaced with a new one after wear. When replacing a new leakage reduction ring, its inner diameter should be configured according to the outer diameter (outer edge diameter) of the impeller (referring to the wheel with moving blades). If the outer diameter of the impeller water inlet is worn, it can be turned to eliminate grooves and ovals, and then a leakage reduction ring with a reduced inner diameter can be configured. The outer diameter of the impeller water inlet can generally be turned three times.  

Do you need a reliable and efficient solution to handle high-temperature applications involving phosphate slurry? Look no further! In this article, we will delve into the world of high-temperature mortar pumps and explore how chemical mortar pumps effectively address the challenges brought by phosphate slurry. Whether you are a professional in the chemical industry or simply curious about this specialized pump, please continue reading to gain the insights you need! What makes high-temperature mortar pumps stand out in harsh application environments? Imagine that in an environment with high temperature and strong corrosiveness like phosphate slurry, ordinary pumps would be overwhelmed. The chemical mortar pumps designed by Anhui Changyu Pump Valve Manufacturing Co., Ltd. specifically for such challenges are the heroes of today. With their corrosion-resistant and high-temperature-resistant FPA materials, they ensure smooth and reliable operation even under the harshest conditions. Phosphoric acid slurry pumps are a special kind of high-temperature pump specifically designed to handle various chemical substances, including phosphoric acid slurry. Through the use of special materials and innovative technologies, these pumps can effectively withstand high temperatures, resist corrosion, and have excellent durability. Their design ensures precise control of flow and transportation, making them an indispensable tool in various industries such as chemical manufacturing, refineries, and sewage treatment plants. One of the key advantages of phosphoric acid slurry pumps is their compatibility with phosphoric acid slurry. This highly corrosive and viscous liquid requires a pump that can handle its unique properties without affecting performance. Chemical mortar pumps are specifically designed to provide effective sealing, prevent leakage and minimize downtime. Their sturdy materials and structure ensure long-term operation even under challenging conditions such as transporting phosphoric acid slurry. In addition to reliability in handling phosphoric acid slurry, chemical mortar pumps also offer other advantages that meet user needs. These pumps are designed for easy maintenance, allowing quick access to components for inspection, cleaning and repair. Their efficient operation helps reduce operating costs, and the compact design saves valuable space. Whether you need continuous pumping or intermittent operation, chemical mortar pumps can be customized according to your specific needs. When it comes to handling high-temperature applications and dealing with corrosive substances such as phosphoric acid slurry, high-temperature mortar pumps, especially chemical mortar pumps, stand out as a reliable and efficient solution. They can withstand extreme temperatures, resist corrosion and handle challenging substances, making them an indispensable asset in various industries. Therefore, if you are looking for a pump that can easily handle phosphoric acid slurry and maintain optimal performance, consider exploring the capabilities of chemical mortar pumps. Experience the power of cutting-edge technology and ensure smooth operation in high-temperature environments.

What is a Filter Press Pump? A filter press pump is a specialized pump used in filter press systems to transfer slurry containing solid particles and provide the necessary flow and pressure during the filtration process. It is widely used in industries such as wastewater treatment, mining, chemicals, and pharmaceuticals for solid-liquid separation processes. The performance of the filter press pump directly impacts filtration efficiency, making it crucial to select the right pump for optimal operation. Working Principles of a Filter Press Pump The filter press pump operates based on centrifugal or diaphragm pump technology. Its main function is to transfer slurry to the filter plates of the press, where solid particles are trapped in the filter cloth to form a cake, while the filtered liquid passes through the cloth and is separated. The pump requirements vary depending on the characteristics of the slurry, including particle concentration and process requirements. A filter press pump must meet two primary criteria: High wear resistance: The slurry typically contains solid particles, and the pump must resist wear during long-term operation. Stable pressure output: The filtration process requires consistent high pressure, and the pump must maintain this pressure throughout the filtration cycle. Types of Filter Press Pumps Depending on the application and process requirements, filter press pumps can be categorized into several common types: Centrifugal Pumps: Ideal for handling low-concentration slurry with high flow rates and low maintenance costs. These pumps are typically used in the initial stages of the filtration process when the slurry has lower concentrations. Diaphragm Pumps: The most commonly used filter press pump, particularly effective for high-pressure and high-concentration slurry transfer. Diaphragm pumps provide stable flow at higher pressures and offer resistance to wear, ensuring a longer service life. Slurry Pumps: Designed for highly abrasive, particle-laden slurry transfer. Slurry pumps feature strong wear resistance and are commonly used in mining and wastewater treatment industries. Key Performance Indicators of Filter Press Pumps Wear Resistance: As slurry often contains abrasive particles, choosing wear-resistant materials is essential. Common materials include cast iron, alloy steel, and ceramics, which can significantly extend the pump’s lifespan. Sealing Performance: Filter press pumps must have excellent sealing capabilities to prevent leakage in high-pressure environments. In cases where corrosive media are present, the seals must also be resistant to chemical damage. High-Pressure Output: The pump must gradually increase pressure during the filtration process, providing the required pressure at different stages to ensure efficient liquid drainage once the filter cake forms. How to Select the Right Filter Press Pump? When selecting a filter press pump, consider the following factors: Slurry Characteristics: Understand the solid content, particle size, and corrosiveness of the slurry to choose a pump with the appropriate wear and corrosion resistance. Flow Rate and Pressure Requirements: Ensure the pump’s flow and pressure meet the process demands based on the filtration system’s specifications. Material and Durability: Given the complexity of the slurry and media, selecting high wear-resistant and corrosion-resistant materials will reduce maintenance costs and extend the pump’s service life. Energy Efficiency: Modern industries are increasingly concerned about energy consumption. Selecting an energy-efficient pump can reduce operational costs and improve overall productivity. Daily Maintenance of Filter Press Pumps To ensure the stable operation of a filter press pump, regular maintenance is essential: Inspect Wear Regularly: Regularly check key components such as the impeller and pump casing for wear, and replace them as needed. Monitor Seals: Seals are prone to damage in high-pressure and chemically aggressive environments. Regular inspections will prevent leaks. Lubrication: Ensure bearings and other moving parts are regularly lubricated to maintain smooth pump operation. Why Choose Changyu Pumps for Filter Press Pump Solutions? At Changyu Pumps, we are dedicated to providing high-performance, durable filter press pumps. Our pumps are made with advanced wear-resistant materials and sealing technologies to ensure reliable operation in high-pressure, particle-laden environments. Whether you need centrifugal, diaphragm, or slurry pumps, Changyu Pumps offers the right solution to meet your needs and ensure the efficiency of your production processes.

What is a Chemical Resistant Centrifugal Pump? A chemical resistant centrifugal pump is designed to handle corrosive liquids in various industrial applications. These pumps are specifically engineered with materials that can withstand harsh chemical environments, ensuring reliable operation and longevity. They are widely used in industries such as chemical processing, wastewater treatment, pharmaceuticals, and food processing. Working Principle of Chemical Resistant Centrifugal Pumps Chemical resistant centrifugal pumps operate based on the principle of centrifugal force. When the pump impeller rotates, it imparts kinetic energy to the fluid, creating a pressure difference that draws the fluid into the pump and forces it out through the discharge. The design allows for efficient fluid movement, making it ideal for transferring various corrosive chemicals. Key Features of Chemical Resistant Centrifugal Pumps Corrosion Resistance: These pumps are constructed from high-grade materials such as stainless steel, polypropylene, and PTFE (Teflon), which provide excellent resistance to a wide range of corrosive substances. Durability: Built to withstand harsh operating conditions, chemical resistant centrifugal pumps often feature reinforced components that enhance their lifespan, reducing the need for frequent replacements. Versatility: Suitable for a variety of applications, these pumps can handle different types of chemicals, including acids, alkalis, and solvents, making them highly versatile in industrial settings. Sealing Options: Advanced sealing technologies, such as mechanical seals and gland packing, are employed to prevent leakage and protect the pump internals from corrosive exposure. Applications of Chemical Resistant Centrifugal Pumps Chemical Processing: Used in the transportation of aggressive chemicals during manufacturing processes, ensuring safe and efficient handling. Wastewater Treatment: Essential for transferring corrosive wastewater, these pumps help in maintaining environmental standards and regulatory compliance. Pharmaceuticals: In the pharmaceutical industry, these pumps are crucial for handling sensitive chemicals and ensuring contamination-free operations. Food Processing: Chemical resistant centrifugal pumps are also used in food processing to handle cleaning agents and other corrosive substances, ensuring hygiene and safety. How to Choose the Right Chemical Resistant Centrifugal Pump When selecting a chemical resistant centrifugal pump, consider the following factors: Fluid Compatibility: Ensure the pump materials are compatible with the specific chemicals being handled to prevent corrosion and damage. Flow Rate and Pressure Requirements: Determine the necessary flow rate and pressure for your application to select a pump that meets these specifications. Temperature Conditions: Evaluate the operating temperature range, as some materials may have limitations that affect performance. Maintenance Needs: Consider the ease of maintenance and availability of replacement parts to minimize downtime and ensure long-term reliability. Maintenance Tips for Chemical Resistant Centrifugal Pumps To maximize the performance and lifespan of chemical centrifugal pump, regular maintenance is essential: Routine Inspections: Regularly check for signs of wear, leakage, and corrosion to address issues before they escalate. Seal Maintenance: Monitor the condition of seals and gaskets, replacing them as needed to prevent leaks and ensure efficient operation. Proper Lubrication: Keep bearings and moving parts adequately lubricated to reduce friction and wear. System Cleanliness: Maintain a clean environment around the pump to prevent contamination and prolong its lifespan. Why Choose Changyu Pumps for Your Chemical Resistant Needs? At Changyu Pumps, we specialize in high-quality chemical resistant centrifugal pumps that meet the stringent demands of various industries. Our pumps are engineered with advanced materials and technologies to ensure exceptional performance and durability in corrosive environments. Whether you need a pump for chemical processing, wastewater treatment, or any other application, Changyu Pumps offers reliable solutions tailored to your needs. Email: jade@changyupump.com

What is a Desulfurization Pump? A desulfurization pump is a specialized pump used in industrial desulfurization processes to handle corrosive and high-temperature fluids. These pumps are commonly used in flue gas desulfurization (FGD) systems of coal-fired power plants, steel plants, and the chemical industry. The primary function of a desulfurization pump is to transport desulfurization slurry from the absorption tower to other components, ensuring the smooth operation of the desulfurization process. Types and Working Principles of Desulfurization Pumps Desulfurization pumps can be classified based on their usage environment and the characteristics of the media they handle. The main types include: Slurry pumps: Designed to transport slurry with high concentrations of solid particles and to withstand abrasive conditions. Self-priming pumps: Equipped with self-priming capability, suitable for systems that require rapid startup. Corrosion-resistant pumps: Made from high-corrosion-resistant materials such as stainless steel, alloys, or ceramics, to handle the acidic and corrosive fluids generated during flue gas desulfurization. In terms of working principle, desulfurization pumps rely on the rotation of an impeller to drive the slurry. Centrifugal force is used to discharge the slurry from the pump body, completing the transport process. Key Performance Indicators of Desulfurization Pumps Corrosion resistance: As desulfurization processes involve corrosive substances like sulfuric acid and calcium sulfate, selecting the right material for the pump is critical. Common materials include high-nickel alloys and duplex stainless steel. Wear resistance: The slurry often contains solid particles, which can wear down the pump over time. Therefore, the pump's design and materials must have high wear resistance. Efficiency: To reduce energy consumption, desulfurization pumps need to maintain high efficiency. This is especially important in large-scale industrial desulfurization projects to save costs. Reliability and stability: Desulfurization systems typically operate continuously, and pump failure can lead to system shutdowns. Therefore, desulfurization pumps must be highly reliable and stable, reducing maintenance costs. How to Select the Right Desulfurization Pump? Selecting the right desulfurization pump is crucial, and the following key steps should be considered: Understand process parameters: First, you need to determine the characteristics of the fluid in the desulfurization process, including temperature, concentration, corrosiveness, and abrasiveness. These factors influence the selection of pump materials and design. Choose the right materials: Select the appropriate pump body material based on the corrosiveness of the media. For highly acidic media, high-alloy materials are recommended, while for strongly alkaline media, materials resistant to alkaline corrosion should be used. Determine flow rate and head: Calculate the required flow rate and head based on the system's needs to ensure that the pump's performance meets process requirements. Consider energy efficiency: Choose energy-efficient pumps that can help reduce long-term operating costs, while still meeting the basic performance requirements. Daily Maintenance of Desulfurization Pumps To ensure stable operation of desulfurization pumps, routine maintenance is essential: Regularly inspect pump body and impeller wear: Especially when transporting high-concentration slurry, regularly check for wear on the impeller and pump casing, and replace severely worn components in a timely manner. Monitor the sealing system: The sealing part of the desulfurization pump is often a vulnerable component. Regularly check the sealing performance to prevent slurry leakage. Lubricate bearings regularly: Bearings are key components of the pump. Regularly apply lubricating oil to ensure smooth operation of the bearings. Why Choose Changyu Pumps for Your Desulfurization Needs? At Changyu Pumps, we are committed to delivering high-performance and highly reliable desulfurization pump solutions. Our pumps are made from advanced corrosion-resistant and wear-resistant materials, specifically designed to perform in harsh working environments. We offer comprehensive pre-sales selection guidance and post-sales maintenance services to ensure each desulfurization pump achieves optimal performance.

Sulfuric acid, a commonly used strong corrosive chemical, plays a vital role in industries such as chemical processing, petroleum, metallurgy, and environmental protection. Therefore, selecting the right material for sulfuric acid pumps is crucial. Not only does it affect the pump’s service life, but it also impacts the safety and efficiency of the transfer process. In this article, we will explore the key factors in choosing the materials for sulfuric acid pumps, examine the performance of various materials, and discuss important considerations in practical applications. 1. Common Materials for Sulfuric Acid Pumps Given that sulfuric acid is highly corrosive, the materials used in sulfuric acid pumps must offer excellent corrosion resistance. The most common materials include the following: Stainless Steel (316L) Advantages: Stainless steel (316L) is widely used for transferring low-to-medium concentrations of sulfuric acid due to its good corrosion resistance. The high molybdenum content in 316L enhances its corrosion resistance in acidic environments, making it particularly suitable for sulfuric acid concentrations below 20% or above 80%. Limitations: Stainless steel’s corrosion resistance diminishes significantly when handling sulfuric acid with concentrations between 40% and 80%. Therefore, extra care should be taken when using stainless steel pumps within this range, considering the temperature and flow rate of the medium. Hastelloy Alloy Advantages: Hastelloy is a nickel-based alloy that offers exceptional corrosion resistance, especially in highly acidic environments. It is ideal for transferring concentrated sulfuric acid, particularly in high-temperature or impure conditions. Hastelloy pumps are commonly used in harsh industrial settings due to their superior properties. Limitations: Hastelloy is relatively expensive, so it is typically reserved for applications that demand high corrosion resistance in extreme environments. Fluoroplastics (FEP/PVDF) Advantages: Fluoroplastics such as FEP (fluorinated ethylene propylene) and PVDF (polyvinylidene fluoride) exhibit excellent chemical stability, providing effective resistance to most acids and bases. These materials are ideal for transferring high-concentration sulfuric acid at low to medium temperatures. They are lightweight, easy to process, and relatively inexpensive, making them a preferred choice for small-to-medium sulfuric acid pumps. Limitations: Fluoroplastics have poor high-temperature resistance, generally not exceeding 150°C, so they are not recommended for high-temperature conditions. Titanium Alloy Advantages: Titanium alloys are known as the “noble” materials in the chemical industry due to their outstanding corrosion resistance, particularly in high-temperature and high-concentration sulfuric acid environments. Their strength and toughness make them suitable for extreme working conditions. Limitations: The high cost of titanium alloys means they are typically used only in very demanding environments. Additionally, titanium can be sensitive to chlorides under certain conditions, so the medium composition must be carefully evaluated. 2. Key Considerations for Matching Sulfuric Acid Concentration and Material The corrosiveness of sulfuric acid varies with concentration and temperature. In practical applications, different concentrations of sulfuric acid require different material properties. Below are common concentration ranges and material recommendations: Low-Concentration Sulfuric Acid (<20%): Stainless steel (316L) and fluoroplastics are suitable, particularly at ambient temperatures where the corrosiveness is relatively mild, offering a broader range of material options. Medium-Concentration Sulfuric Acid (20%-80%): This range presents severe corrosion challenges for metals. High-corrosion-resistance alloys like Hastelloy or non-metal materials like fluoroplastics are recommended to ensure safety. High-Concentration Sulfuric Acid (>80%): For high-concentration and low-temperature conditions, 316L stainless steel is still viable. However, for high-temperature environments, Hastelloy or titanium alloys are needed to resist sulfuric acid corrosion. 3. Additional Factors to Consider in Material Selection Medium Temperature Elevated temperatures accelerate the corrosion process, particularly when transferring high-concentration sulfuric acid. It is crucial to consider the material’s heat resistance. For high-temperature scenarios, metal materials like Hastelloy or titanium alloys are more suitable than fluoroplastics. Pump Design and Manufacturing Process While corrosion resistance is critical, the pump’s structural design and manufacturing process are equally important. Precision manufacturing, smooth surface treatments, and leak-proof sealing designs can extend the pump’s service life and reduce maintenance frequency. Medium Impurities Sulfuric acid often contains impurities such as chlorides and nitrates, which can intensify material corrosion. When selecting materials, a comprehensive corrosion analysis based on the actual composition of the medium is essential. 4. Case Study: Material Selection for Sulfuric Acid Pumps In a chemical plant, the company needed to transfer 95% sulfuric acid at a temperature of 120°C. Given the high concentration and high temperature, stainless steel was found to corrode severely. The final material choice was Hastelloy C276, which not only significantly extended the pump's service life but also improved transfer efficiency and reduced the frequency of pump replacements and maintenance. Additionally, for transferring 40% sulfuric acid, the plant opted for a fluoroplastic pump due to its excellent corrosion resistance and relatively economical cost. 5. Conclusion The material selection for sulfuric acid pumps directly affects the performance, longevity, and operational safety of the equipment. For different concentrations, temperatures, and working conditions, choosing the right material is essential. Users should carefully evaluate the specific requirements of their application, including the medium properties, pump design, and cost considerations, to select the most suitable material for safe and efficient sulfuric acid transfer.

Acid-resistant pumps play a crucial role in industries such as chemical engineering, metallurgy, and electronics. The material of the pump directly influences its corrosion resistance, mechanical properties, and service life. This article will explore the performance characteristics of common materials used in acid-resistant pumps and provide a scientific and systematic selection guide tailored to practical application scenarios. Performance Comparison of Common Acid-Resistant Pump Materials Material Advantage Disadvantage Applicable Media PTFE Excellent chemical resistance, high temperature resistance, self-lubricating, good mechanical properties Higher cost and poor pressure resistance Acids, alkalis, oxidants, organic solvents FEP Excellent chemical resistance, high temperature resistance, good flexibility, easy processing High cost Acids, alkalis, oxidants, organic solvents PVDF Good chemical resistance, high temperature resistance, high mechanical strength Poor heat and wear resistance Acids, alkalis, oxidants, organic solvents Stainless Steel Excellent mechanical properties, good corrosion resistance, moderate price Poor corrosion resistance to some strong oxidizing media Dilute Acid and Weak Alkali Salt Solutions Titanium Alloy Excellent corrosion resistance, high temperature resistance, and good biocompatibility High cost and difficult processing Seawater, chlorine, aqua regia, etc. Ceramics Excellent wear resistance, high temperature resistance, good chemical stability Brittle, easy to break Solid particles, strong acids, strong bases Acid-Resistant Pump Material Selection Principles Media Properties: Type, concentration, and temperature of the acid: Different materials exhibit varying degrees of corrosion resistance to different acids. Oxidizing properties of the media: Media with strong oxidizing properties can cause more severe corrosion to metallic materials. Viscosity of the media: High viscosity media can cause greater wear to the pump, requiring materials with good wear resistance. Operating Conditions: Flow rate, head, and operating pressure: Different operating conditions demand different material properties for the pump. Solid particle content in the media: Media with high solid content requires materials with superior wear resistance. Operating Environment: Temperature: Material properties can change in high-temperature environments. Corrosive gases: Corrosive gases can accelerate the degradation of materials. Economic Factors: Material cost: There is a significant cost difference between various materials. Maintenance cost: The durability of the material directly impacts maintenance costs. Case Study: Material Selection for a Sulfuric Acid Transfer Pump For concentrated sulfuric acid transfer, PTFE or FEP materials are typically chosen due to the strong oxidizing nature of concentrated sulfuric acid, which becomes even more corrosive at high temperatures. If cost is a concern, PVDF can be used, but careful temperature control is necessary. Conclusion The selection of materials for acid-resistant pumps is a complex process that requires careful consideration of the properties of the media, operating conditions, environment, and economic factors. By thoroughly understanding the performance characteristics of different materials and considering the specific application scenarios, the most suitable material can be chosen to ensure the long-term and stable operation of the pump.

In industrial pump applications, both sludge pumps and slurry pumps are commonly used for handling fluids that contain solids. While they share similar working principles and uses, there are some key differences in their design, application, and the materials they handle. This article will delve into these differences to help you choose the right pump for your specific needs. 1. Materials Handled Sludge Pump A sludge pump is typically used to handle semi-solid materials, such as sludge from wastewater treatment plants, industrial wastewater, or even oil sludges. These materials often contain a high percentage of organic matter and sediments, making them thick and viscous. Sludge pumps are designed to handle these low-flow but high-density substances and require significant pushing power to maintain flow. Slurry Pump A slurry pump, on the other hand, is specifically designed for transporting liquids containing solid particles. These are common in industries such as mining, chemical processing, and cement manufacturing, where slurries, such as mud or mortar, are frequently moved. The solid particles in the slurry can be highly abrasive, so slurry pumps are built to withstand wear and tear. 2. Design Characteristics Sludge Pump Design Due to the highly viscous nature of sludge, sludge pumps are designed with larger passageways to ensure that large particles or sticky materials don’t clog the system. These pumps typically operate at lower flow rates but are capable of handling higher concentrations of suspended solids. Slurry Pump Design Slurry pumps are built with abrasion-resistant materials, such as rubber or alloy, to endure the constant impact of solid particles. Unlike sludge pumps, slurry pumps need to maintain high flow rates to efficiently transport large volumes of liquid mixed with solid particles, ensuring the smooth movement of the slurry. 3. Application Areas Sludge Pump Applications Sludge pumps are widely used in wastewater treatment plants, industrial waste disposal, oil fields, and the paper industry. Their primary function is to handle high-concentration semi-solid materials like municipal sludge, oil sludge, or industrial waste byproducts. Slurry Pump Applications Slurry pumps are predominantly used in mining, quarrying, chemical processing, and steel manufacturing, where they are employed to move slurry, mine tailings, sand, and other abrasive materials. They are also widely used in cement plants, coal mines, and metal ore transportation. 4. Operating Conditions Sludge Pump Sludge pumps are typically designed to operate under low-pressure, low-flow conditions. Their focus is on handling high concentrations of viscous materials, requiring pumps to be clog-resistant and corrosion-resistant. Slurry Pump Slurry pumps often operate under high-pressure conditions to transport larger volumes of material efficiently. They are built to handle harsh environments and must be highly wear-resistant and reliable due to constant exposure to abrasive particles. 5. Maintenance and Lifespan Sludge Pump Due to the viscous nature of sludge, sludge pumps require frequent maintenance, especially when it comes to clearing the internal passageways to prevent clogging. Additionally, since sludge often contains corrosive substances, the pump material must be resistant to corrosion. Slurry Pump Slurry pumps are designed for abrasive environments, and although the materials used are highly resistant to wear, key components like the impeller will need periodic replacement to ensure efficient operation over time. Conclusion While sludge pumps and slurry pumps both handle solid-laden fluids, their design and applications differ. Sludge pumps are better suited for handling high-viscosity, semi-solid materials like municipal sludge or industrial waste, while slurry pumps are ideal for transporting liquids containing abrasive solid particles, such as slurry or mine tailings. Choosing the right pump depends on the type of material you're working with, your operating conditions, and your industry requirements. Understanding these differences can help ensure you select a pump that balances operational efficiency with maintenance costs. We hope this article has helped clarify the differences between sludge pumps and slurry pumps. If you have any further questions or need additional advice, feel free to contact us. Anhui Changyu Pump Valve Manufacturing Co., Ltd.As a leading pump manufacturer, we provide high-quality magnetic pumps, centrifugal pumps, corrosion-resistant pumps, and other industrial pumps, widely used in petrochemical, new energy, biopharmaceutical, and other industries.