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Introduction A centrifugal pump is a mechanical device that converts the rotational energy of an impeller into fluid kinetic energy to transport liquids. Centrifugal pumps are widely used in industries such as water treatment, oil and gas, chemical processing, and HVAC systems, and are key equipment for efficient liquid transportation. In this article, we will explore the working principle of centrifugal pumps, their key components, different types, and applications to help you gain a comprehensive understanding of what centrifugal pumps are. Continue reading to learn more! How Does a Centrifugal Pump Work?   The working principle of a centrifugal pump involves an electric motor driving the impeller to rotate at high speed, thereby causing the liquid inside the pump to form a rotating flow and generating high kinetic energy at the impeller outlet. Under the influence of centrifugal force, the liquid flows along the pump casing toward the outlet or is transported to the next stage impeller. Simultaneously, a low-pressure zone forms at the center of the impeller due to the outflow of liquid, creating a pressure difference with the liquid at the suction inlet, which drives the liquid to continuously enter the pump body. As the impeller continues to rotate, the pump achieves continuous suction and discharge, completing the liquid transportation process.     Centrifugal Pumps Parts Industrial centrifugal pumps mainly consist of impellers, pump casings, pump shafts, bearing assemblies, sealing devices, suction and discharge ports, and drive motors. The following are the functional characteristics of each component:   Impeller: The impeller is the rotating element that imparts kinetic energy to the fluid, generating centrifugal force to move the liquid outward. Pump Casing: The casing encloses the impeller and directs the flow of liquid from the impeller to the discharge outlet while converting velocity into pressure. Shaft: The shaft transmits mechanical energy from the motor to the impeller, maintaining stable rotation and alignment. Bearing Assembly: Bearings support the shaft and reduce friction, making is smooth and precise operation. Mechanical Seal or Packing: Prevent liquid from leaking along the shaft where it exits the casing. Suction and Discharge Nozzles: The suction nozzle allows fluid to enter the pump, while the discharge nozzle guides it out under pressure. Motor or Driver: The motor provides the necessary power to rotate the impeller and drive the pumping process.   Types of Centrifugal Pumps Centrifugal pumps have a variety of designs and models to meet different industrial application needs. The following are some common types: Centrifugal Pump​ Magnetic Pump Self-Priming Pump Submersible Pump   Magnetic Drive Pumps: Utilize leak-free magnetic drive technology, suitable for transporting flammable, explosive, or toxic media (such as solvents, liquid chlorine). Semi-Submersible Pumps: The motor is exposed above the liquid surface, suitable for applications with significant fluctuations in water level (such as drainage stations, temporary flood control). Self-priming pumps: Equipped with an air release function, eliminating the need for manual priming, suitable for intermittent suction (e.g., ship ballasting, construction site drainage). Diaphragm pumps: Utilize diaphragm reciprocating motion to transport high-viscosity or particulate-containing liquids (e.g., slurry, paint). Water pumps: General-purpose design for clean water transportation (e.g., municipal water supply, agricultural irrigation). Acid pumps: Manufactured using corrosion-resistant materials (e.g., PVDF, Hastelloy), specifically designed for acidic media (e.g., sulfuric acid, hydrochloric acid). Alkali pumps: Equipped with special seals and material processing techniques, suitable for strong alkaline liquids (e.g., sodium hydroxide, electrolyte).   What is centrifugal pump used for?   Industrial centrifugal pumps are widely used across multiple industries: Water & Wastewater: Transferring clean water, sewage, and stormwater in treatment plants. Oil & Gas: Transporting crude oil, refinery fluids, and seawater in offshore operations. Chemical & Pharma: Handling corrosive acids, solvents, and sterile pharmaceutical liquids. Power Plants: Circulating boiler feedwater, cooling water, and condensate in energy generation. Mining & Manufacturing: Pumping abrasive slurries and industrial coolants. Agriculture: Distributing irrigation water and agrochemicals efficiently. Advantages of Centrifugal Pumps   High Efficiency: Engineered for optimal energy conversion, delivering superior flow rates with minimal power consumption. Low Maintenance: Simplified mechanical design with only one rotating component (impeller) reduces wear and maintence. Compact Footprint: Space-saving vertical/horizontal configurations adapt to constrained industrial layouts. Material Versatility: Available in stainless steel, cast iron, fluoroplastic and advanced polymers to handle corrosive/abrasive media. Pulsation-Free Operation: Continuous rotary motion ensures smooth, vibration-free fluid transfer critical for precision processes.   Conclusion Centrifugal pumps are versatile, highly efficient, and widely used, making them the core equipment of modern fluid delivery systems. As a professional pump solution provider, we focus on meeting the special fluid handling needs of various industries and offer comprehensive customized services. If you need the most suitable pumping solution for your working conditions, please feel free to contact our technical experts for consultation.  

The strong oxidizing property (ORP＞+1000mV) and crystallization tendency of sodium chlorate solution make it a "pumping killer", while the fluorine-lined pump reinforced with ultra-high molecular weight polyethylene (UHMWPE) has achieved a breakthrough performance improvement through material composite innovation.   ① Performance leap brought by material composite   1. Anti-wear revolution   1.1 The addition of UHMWPE (molecular weight ≥3 million) increases the wear resistance by 8 times (ASTM D4060 test)   1.2 The ability of the impeller edge to resist particle erosion is 3.2 times that of the ordinary F46 pump (actual measurement under the condition of 15% concentration containing crystal slurry)   2. Temperature-corrosion synergistic resistance Temperature range Pure F46 performance UHMWPE Enhanced Performance Below 80℃ Annual corrosion: 0.008mm 0.005mm 80-120℃ Prone to stress cracking Maintaining the complete lattice structure Short-term exposure up to 150°C Irreversible deformation Can withstand 4 hours of thermal shock   ② Comparison of key engineering parameters   1. Life cycle:   1.1 Continuous operation time: 8000h for ordinary fluorine-lined pump vs 25000h for ultra-high molecular fluorine-lined pump   1.2 Overhaul interval extended to 5 years (under sodium chlorate crystallization conditions)   2. Energy efficiency performance:   2.1 Volumetric efficiency > 92% 2.2 Save 15-18% electricity compared to ordinary fluorine-lined pumps   ③ Full cost economic verification   1. Initial investment: 40% lower than Hastelloy pumps and 25% higher than ordinary fluorine-lined pumps   2. Comprehensive benefits:   2.1 Spare parts consumption reduced by 60%   2.2 Sudden downtime losses reduced by 92%   Case study: After a company in Jiangxi used this pump type to transport sodium chlorate, the annual maintenance cost of a single line was reduced from 280,000 to 65,000, and the production capacity was increased by 23%. (China Chlor-Alkali Industry Association 2025 Blue Book) This case can be found.

I. Diagnosis of the root cause of vibration   1.1 Mechanical vibration (accounting for 45% of the causes of failure) · Impeller dynamic balance failure (＞0.5mm/kg needs to be corrected) · Bearing clearance exceeds the standard (radial clearance＞0.15mm) · Coupling centering deviation (angle error ≥0.05mm/m)   1.2 Fluid dynamic vibration (accounting for 35% of the causes of failure) · Cavitation phenomenon (NPSHa＜NPSHr+0.5m) · Eddy current excitation (risk surges when flow rate＞2.5m/s) · Medium gas content exceeds the standard (＞5% volume ratio)   1.3 Structural resonance (accounting for 20% of the causes of failure) · Natural frequency and speed frequency coincide (±10% danger zone) · Pipeline support spacing is too large (carbon steel pipe＞3m without support)   II. On-site investigation process 1. Vibration value detection: If ＞4.5mm/s, then (spectrum Analysis) 2. Determine whether it is high-frequency vibration? 3. If yes: check bearings/gears If not: check whether it is low-frequency vibration? 4. If it is low-frequency vibration: check impeller/coupling If it is not low-frequency vibration: check fluid system   III.  solutions 3.1 Mechanical adjustment Impeller G6.3 dynamic balancing (residual imbalance <8g) Use laser alignment instrument for correction (error control within 0.02mm)   3.2 System optimization Add inducer to improve cavitation Install damper at outlet (rubber flexible joint recommended) 3.3 Intelligent monitoring Install wireless vibration sensor (recommended 100Hz sampling rate) Establish vibration trend map (warning value set to 4.5mm/s of ISO10816-3)   IV. Preventive maintenance plan Weekly: Check anchor bolt torque (M20 bolts require 450N·m) Monthly: Lubricating oil particle size detection (within NAS Class 8) Yearly: Perform modal analysis to verify structural natural frequency  

1. Industry Background and Challenges‌ In mining and metallurgical production processes, large volumes of corrosive media—such as acidic solutions, alkaline liquids, and organic solvents—must be handled. These substances are not only highly corrosive but may also contain solid particles or other impurities, imposing stringent demands on pump materials, sealing performance, and operational stability. Selecting the appropriate pump solutions is critical to ensuring continuous and safe production. 2. Overview of Anhui Changyu Pump & Valve Solutions‌ Anhui Changyu Pump & Valve Manufacturing Co., Ltd. has developed a range of specialized pump products tailored to the unique demands of the mining and metallurgical industries. Below are the key pump solutions offered: ‌2.1. Corrosion-Resistant Magnetic Drive Pumps‌ ‌Working Principle‌: Utilizes magnetic coupling technology to eliminate mechanical seals, ensuring leak-free operation. ‌Materials & Applicable Media‌: Constructed with high-performance corrosion-resistant alloys (e.g., 304, 316, 316L stainless steel, Hastelloy), ideal for handling highly corrosive fluids. ‌Advantages‌: Compact design, smooth operation, and suitability for diverse corrosive media in mining and metallurgical processes. ‌2.2 Plastic-Lined Slurry Pumps‌ ‌Applications‌: Designed for corrosive slurries such as phosphoric acid slurry and fluorosilicic acid slurry. ‌Features‌: Plastic-lined interior for enhanced corrosion resistance, combined with superior abrasion resistance for particle-laden media. ‌Advantages‌: Easy maintenance and reliable performance, making them ideal for slurry transportation in mining and metallurgy. ‌2.3 Stainless Steel Centrifugal Pumps‌ ‌Materials‌: Premium stainless steel construction for excellent corrosion and high-temperature resistance. ‌Applications‌: Suitable for seawater, brine, organic solvents, and other corrosive media at varying concentrations. ‌Advantages‌: Compact structure, high efficiency, and versatility for diverse corrosive fluid handling needs in the industry. 3. Detailed Application Scenario Analysis‌ ‌3.1. Ore Processing‌ ‌Process Description‌: Involves crushing, grinding, and leaching of ores, requiring handling of large volumes of corrosive media. ‌Pump Selection‌: Corrosion-resistant magnetic drive pumps and stainless steel centrifugal pumps are ideal for ore processing, ensuring stable transportation and leak prevention. ‌3.2 Flotation Separation‌ ‌Process Description‌: Separates valuable minerals from waste rock via flotation technology, involving corrosive reagents. ‌Pump Selection‌: Plastic-lined slurry pumps excel in flotation due to their corrosion and abrasion resistance. ‌3.3 Smelting & Extraction‌ ‌Process Description‌: Operates in high-temperature, high-pressure environments with corrosive media. ‌Pump Requirements‌: Pumps must resist corrosion, high temperatures, and pressure. Magnetic drive pumps and stainless steel centrifugal pumps are preferred for their superior performance. ‌3.4 Tailings Treatment‌ ‌Process Description‌: Handles slag and tailings containing solid particles and acidic waste liquids. ‌Pump Selection‌: Plastic-lined slurry pumps, balancing corrosion and abrasion resistance, are optimal for tailings processing. 3.5 Cooling Circulation‌ ‌Process Description‌: Requires corrosion-resistant cooling media circulation in smelting. ‌Pump Requirements‌: Pumps must resist corrosion and ensure long-term stability. Stainless steel centrifugal pumps are well-suited for this application. 4. Conclusion‌ Leveraging extensive expertise and cutting-edge technology in pump and valve manufacturing, Anhui Changyu Pump & Valve Manufacturing Co., Ltd. delivers a comprehensive range of high-efficiency, reliable pumping solutions tailored for the mining and metallurgical industries. These solutions not only address the industry's specialized requirements for handling corrosive media but also enhance operational stability and safety in production processes. Moving forward, as technology evolves and industry demands continue to shift, Anhui Changyu Pump & Valve remains committed to innovation and R&D, striving to provide the mining and metallurgical sectors with superior pump products and technical services.  

This paper addresses three core pain points in wastewater treatment for the chemical industry, analyzing the technical compatibility of Anhui Changyu Pump & Valve's flagship products.   1. Three Core Challenges in Chemical Effluent Treatment‌ ‌1.1 Media Complexity‌ Chemical wastewater often contains strong acids, alkalis, organic solvents, and solid particles, leading to corrosion, crystallization, and clogging in conventional pumps. For example, one chemical plant experienced pump casing perforation due to chloride-induced corrosion, resulting in monthly maintenance costs exceeding ‌100,000 RMB‌. 1.2 Harsh Operating Conditions‌ High temperatures (up to ‌150°C‌) and high pressures (some process sections require ‌≥2.5MPa‌) demand superior sealing performance and structural integrity. Industry reports (2024) indicate that ‌23% of unplanned shutdowns‌ are caused by pump/valve failures. 1.3 Environmental Compliance Pressure‌ The updated ‌GB31571-2025 Petroleum & Chemical Industry Emission Standards‌ mandate a leakage rate below ‌0.1%‌, making traditional packed-seal pumps increasingly non-compliant.   2. Scenario-Based Selection Strategies‌ 2.1 Highly Corrosive Media (e.g., Hydrofluoric Acid, Mixed Acids)‌ ‌Recommended Model:‌ ‌CYQ Fluoroplastic Magnetic Drive Pump‌ ‌Key Features:‌ Full perfluoroelastomr (FFKM) seals + silicon carbide (SiC) bearings Compatible with ‌pH 0–14‌ ‌Case Study:‌ Achieved ‌8,000+ hours‌ of continuous operation in lithium battery waste acid treatment with zero corrosion.   2.‌2  High-Solid Content Wastewater (e.g., Catalyst Particles, Sludge)‌ ‌Cost-Effective Option:‌ ‌FYH Fluoroplastic Submersible Pump‌ (≤20% solids) ‌Unique Advantage:‌ Open-type triple-channel impeller design improves particle passage by ‌40%‌ vs. standard pumps. ‌Application Example:‌ Used in a ‌titanium dioxide plant‌ (Anhui) for titanium slag wastewater (particle size ≤8mm).‌High-Pressure Alternative:‌ ‌CYF Fluoroplastic Centrifugal Pump‌ (requires pre-filtration).   2.3 High-Temperature/Pressure Conditions (e.g., Distillation Tower Effluent)‌ ‌High-Temp CYQ Model:‌ Equipped with ‌samarium-cobalt (SmCo) magnets‌, maintaining ‌>92% magnetic drive efficiency at 150°C‌. ‌Alternative:‌ ‌CYC Stainless Steel Magnetic Pump‌ (requires cooling below ‌120°C‌).   2.4 Environmentally Sensitive Zones‌ ‌Mandatory Choice:‌ ‌CYQ/CYC Magnetic Pump Series‌ ‌Certified Leakage Rate:‌ ‌<0.01%‌, compliant with ‌EU TA-Luft Standards‌. ‌Case Implementation:‌ Adopted plant-wide in a ‌Shanghai fine chemical park‌ as a replacement for traditional pumps.   3. Selection Pitfall Avoidance Guide‌ ‌3.1 Common Mistakes to Avoid‌ ‌Stainless Steel Pumps (CYC/FY Series):‌Not suitable for media containing ‌>50ppm chloride ions‌ (prone to stress corrosion cracking). ‌CYF Centrifugal Pumps:‌Dry running must be avoided (fluoroplastic material has poor heat conductivity and may deform).   ‌3.2 Efficiency-Enhancing Configurations‌ ‌For Crystallizing Media:‌Install ‌flushing ports‌ on ‌CYQ pumps‌. ‌For Fluctuating Flow Rates:‌Equip ‌FYH pumps‌ with ‌variable frequency control systems‌ (energy savings ≥30%).   This selection system can cover ‌over 95% of chemical industry wastewater scenarios‌. Final confirmation should be based on ‌specific media composition reports‌ (must include ‌Cl⁻, F⁻, and solid content‌ data).           2.‌2<

This article analyzes the available pump types for specific media to help you make a faster and more effective selection, and also provides some data for your reference.   1.Working condition characteristics analysis   Medium characteristics Strong acidity: pH=2 is a strong acid environment, and the acid corrosion resistance of the material needs to be considered   Oxidation: The medium has oxidizing properties, and the material's antioxidant capacity needs to be evaluated   Containing solid particles: The presence of small sand particles will cause wear problems (it is recommended to confirm the particle size distribution and concentration)   2.Material selection   2.1 It is recommended to use PTFE (polytetrafluoroethylene) or F46 lined pump body, which has the following features:   ✓ Strong acid resistance (applicable to the full range of pH 0-14) ✓ Excellent oxidation resistance ✓ Smooth surface and not easy to scale 2.2 Mechanical seals are recommended to use SiC/SiC pairing, which is more resistant to particle wear than graphite   2.3 Key selection parameters   Required notes Speed ≤ 2900rpm: reduce particle erosion and wear Impeller type semi-open/open impeller: avoid blockage of closed impeller flow channel Gap design is 0.3-0.5mm larger than standard pump to accommodate particle passage Shaft seal type: double-end mechanical seal + flushing water (Plan53B external flushing solution is recommended)     3. Special design points   Wear-resistant structure The impeller front cover is thickened by 2-3mm A replaceable wear-resistant plate is set at the volute of the pump body The surface of the flow-through parts can be hardened   4. Operation suggestions   It is recommended to install a Y-type filter at the inlet (the mesh size is determined by the particle size) The minimum flow rate should be >30% Qn to prevent solid deposition The flow channel should be flushed in time when the machine is shut down   5. Recommended typical models   Domestic: IHF80-65-160 fluoroplastic centrifugal pump (with wear-resistant modification kit) Imported: CPK80-200F (with impeller for granular media) If the budget is li mited, you can consider: FSB80-50-200 (need to confirm the actual particle parameters)   If you have better ideas, please leave a message. We are happy to learn new knowledge and provide better service. Attached is the performance curve of our IHF chemical pump：

Introduction: The Industrial Value of Slurry Pumps‌ Slurry pumps serve as core conveying equipment in industries such as mining, metallurgy, and chemical processing, undertaking the critical task of transporting highly abrasive, high-concentration solid-liquid mixtures. According to 2024 data from the China Heavy Machinery Industry Association, the global slurry pump market has surpassed $5.2 billion, with China accounting for 38% of the market share.   1. Core Knowledge System of Slurry Pumps‌ 1.‌1 Basic Definition and Working Principle‌ 1）Professional Definition‌: A slurry pump (Slurry Pump) is a centrifugal pump specifically designed for transporting slurries containing solid particles. 2）Working Principle‌: The rotation of the impeller generates centrifugal force, imparting kinetic energy to the solid-liquid mixture (Key parameters: Head 30-150m, Flow rate 10-6000m³/h). 1.2 Comparison of Mainstream Types ‌Project Site‌‌ Company ‌Application Scenario Phosphoric acid slurry in phosphate fertilizer production Anhui Changyu Pump And Valve (CHANGYU) Fluoroplastic slurry pumps, corrosion-resistant horizontal centrifugal pumps. River dredging Grundfos Submersible slurry pumps. Mine tailings transportation Shijiazhuang Industrial Pump Factory Vertical submerged pumps, chemical slurry circulation pumps. Blast furnace slag treatment in steel plants Anhui Changyu Pump And Valve (CHANGYU) High-temperature slurry pumps (with cooling system, heat-resistant alloy steel material such as CD4MCu).   3. Key Performance Indicators‌ 1）‌Wear Rate‌: Hard alloy lining with HRC58 or higher 2）‌NPSHr‌: ≤4.5m 3）‌Efficiency‌: Heavy-duty pumps achieve 75-82%   2. Selection Decision Tree‌ 2.‌1 Medium Characteristics Analysis‌ ‌Particle Size‌: μm-level to mm-level ‌Concentration Range‌: 5%-70% wt ‌pH Value‌: Acidic/Alkaline medium ‌2.2 Operating Condition Matching‌ 1）‌98% Concentrated Sulfuric Acid Circulation (80°C)‌: ‌CYF Series (Fluoroplastic-Lined Pump)‌ — ‌CYF80-50-250 2）‌High-Hardness Mineral Slurry (Quartz Sand Tailings, SiO₂ Content >90%)‌: ‌CYH Series (High-Chrome Alloy Pump)‌ — ‌CYH150-400B‌ 3）‌Titanium Dioxide Acid Digestion Filtration (20% Sulfuric Acid + Titanium Slag)‌:Fluorine-Lined Filter Press Pump (PTFE Back Ring on Impeller, Outlet with Safety Pressure Relief Valve) — ‌CYF80-65-160   3. Fluoroplastic Slurry Pump Maintenance Instructions‌ 3.‌1 Daily Operation Maintenance‌ 1） Vibration Monitoring‌ Daily inspection of bearing vibration value (should be ≤4.5mm/s) Abnormal vibration requires immediate impeller balance check 2） Sealing System Management‌ Mechanical seal flush water pressure must be maintained ‌0.1-0.2MPa higher‌ than pump chamber pressure Weekly inspection of seal leakage (normal ≤5 drops/minute) 3.‌2 Periodic Maintenance Standards‌ 1） Flow-Part Inspection‌ Measure fluoroplastic lining thickness every ‌500 hours‌ (wear allowance ≥3mm) Impeller and wear ring clearance should be ‌0.5-1.0mm‌ 2） Lubrication System‌ Bearings: Replace grease every ‌2000 hours‌ (recommended ‌PTFE-based grease‌) Motor bearings: Annual cleaning and oil change 3.3 Special Condition Handling‌ 1）Crystalline Medium Treatment‌ Flush pump chamber with clean water after shutdown (especially when handling crystallizing media) For long-term shutdowns, drain residual liquid and perform drying treatment ‌2）Temperature Control‌ Monitor lining thermal deformation when medium temperature ‌>80°C‌ Avoid sudden cooling/heating (‌

#Submersible pumps are core equipment in chemical processes. With their corrosion resistance and efficient transportation, they significantly improve production safety and efficiency. According to global market data in 2024, submersible pumps account for 35% of the chemical industry, of which #fluoroplastic submersible pumps and #stainless steel submersible pumps are the two main types, targeting different working conditions.   1. Fluoroplastic submersible pump   Application areas: strong acid (such as sulfuric acid, hydrochloric acid), strong alkali and organic solvent transportation, commonly used in electroplating, pharmaceuticals, and wastewater treatment.   ①Advantages: Extremely corrosion-resistant, PTFE material can resist 98% of chemical media; Good sealing performance, reducing the risk of leakage; Lightweight design, easy installation and maintenance.   ②Disadvantages: Low mechanical strength, poor adaptability to high temperature and high pressure scenes; Price is higher than ordinary metal pumps (average price is 20%-30% higher).   2. Stainless steel submersible pump   Application areas: medium and low corrosive media (such as salt water, weak acid), food processing and petroleum industry.   ①Advantages: Sturdy structure, suitable for high pressure and high temperature environment; Low cost, market share of about 60%; High degree of customization (such as 316L stainless steel model). ②Disadvantages: Insufficient tolerance to highly corrosive media such as hydrofluoric acid; Long-term use may cause pitting due to chloride ions.   2. The innovative contribution of submersible pumps to the chemical industry   Submersible pumps solve the leakage and efficiency problems of traditional pumps in the transportation of corrosive and high-temperature media through the design of direct immersion in the medium, becoming a key equipment for chemical process upgrades. Its core changes are reflected in two major technical routes:   4. Breakthrough application of fluoroplastic submersible pumps   Corrosion-resistant revolution: Using materials such as PTFE, it can withstand 98% of chemical media (such as hydrofluoric acid and concentrated sulfuric acid), which can extend the equipment life of high-corrosion fields such as electroplating and pharmaceuticals by 3-5 times   Safety upgrade: Magnetic drive technology (such as the Coenco brand) completely eliminates the risk of leakage and meets the explosion-proof requirements for the transportation of flammable and explosive media   5. Adaptability optimization of stainless steel submersible pumps   Cost-effectiveness advantage: It occupies 60% of the market share and is suitable for medium and low corrosion scenarios (such as salt water and weak alkali). It has been expanded to the food processing field through the upgrade of 316L material   High temperature and high pressure adaptation: Sulzer API 610 BB5 pumps achieve stable operation at 300℃ in slurry bed residue oil hydrogenation units   6.  Systematic industry impact   Environmental benefits: Wastewater treatment pumps (such as Wilo's 144 submersible mixers) help Zhuyuan Sewage Plant increase its daily processing capacity to 3.4 million m³.

This article aims to introduce the performance of self-priming pumps in more detail and under what working conditions you should choose #self-priming pumps. I hope it will be helpful to you. 1. Comparison between #fluoroplastic self-priming pump and #stainless steel self-priming pump   ①. Fluoroplastic self-priming pump Performance characteristics: Made of PTFE/PP and other materials, resistant to strong acids and alkalis (such as 98% sulfuric acid, 50% hydrofluoric acid) Applicable working conditions: chemical waste acid treatment, electroplating liquid transportation, corrosive media in the pharmaceutical industry Advantages: Corrosion resistance far exceeds that of metal pumps, light weight (30% lighter than stainless steel of the same model) Disadvantages: Upper temperature limit 120℃ (stainless steel can reach 200℃), not resistant to particle wear   ②. #Stainless steel self-priming pump (304/316L) Performance characteristics: high mechanical strength (compressive capacity up to 1.6MPa), can handle media containing trace solid particles Applicable working conditions: food processing (such as sauce transportation), seawater desalination pretreatment, environmental sewage treatment Advantages: good structural stability, long maintenance cycle (bearing life is about 8000 hours) Disadvantages: not resistant to chloride ion corrosion (316L should be used with caution when Cl-＞200ppm)   2. #Fluoroplastic self-priming pump vs #Fluoroplastic centrifugal pump‌   ①. Fluoroplastic self-priming pump‌ Through the gas-liquid separation chamber and reflux hole design, it needs to be filled with liquid once before the first start, and then the air in the suction pipeline can be automatically discharged to form a vacuum (the self-priming height is usually 3-4m) Typical structure: external mixing design, the impeller groove and the volute cooperate to achieve gas-liquid mixing and separation   ②. #Fluoroplastic centrifugal pump‌ Relies on the centrifugal force of the impeller to transport liquid, must be completely filled with liquid and exhausted before starting, no self-priming ability Typical structure: closed impeller + volute flow channel, high requirements for medium purity   ③. Key performance comparison Comparison Items Fluoroplastic self-priming pump Fluoroplastic centrifugal pump Self-priming ability Can handle media with gas content ≤15% It needs to be completely exhausted. When the gas content is >5%, it is easy to cavitation. Startup method No need to repeat the operation after the first filling Each start requires filling and exhaust Efficiency Lower (about 5-8% lower than centrifugal pump) Higher (n can reach more than 70%) Particle resistance Only suitable for media without solid particles Can handle media containing trace particles (≤0.1mm) Installation Requirements No foot valve required (except for special working conditions) Need to install bottom valve or vacuum water diversion device   ④. Typical application scenarios   Preferred working conditions for fluoroplastic self-priming pumps Intermittent operation: such as chemical tank truck unloading, electroplating liquid circulation Large liquid level fluctuations: underground storage tank suction, emergency drainage   Preferred working conditions for fluoroplastic centrifugal pumps Continuous and stable transportation: pickling production line, pure water circulation system High head requirements: chemical process pressurization (head can reach more than 80m)   ⑤. Selection recommendations   Select self-priming pumps: when the working conditions have frequent start and stop, pipeline gas storage risks or the installation position is higher than the liquid level   Select centrifugal pumps: for scenes that pursue high efficiency, large flow stable transportation and can ensure continuous filling   3. Stainless steel self-priming pumps vs. #Stainless steel centrifugal pump   ①.Core differences:   Self-priming ability: The self-priming pump can form a 5m water column vacuum when it is first started (the centrifugal pump needs to be filled with water)   Gas-liquid mixed transmission: The self-priming pump can handle media with a gas content of 15% (the centrifugal pump is limited to 5%)   Efficiency curve: The centrifugal pump is 5-8% more efficient at the rated point, but the self-priming pump is more stable under variable conditions   Installation requirements: The centrifugal pump requires NPSH>3m, and the self-priming pump allows a negative NPSH   ②.Selection suggestions:   Select a self-priming pump for frequent start-stop/liquid level fluctuations (such as unloading oil from a tanker truck)   Select a centrifugal pump for large flow and stable conditions (such as fire water supply system)

Introduction #Fluorine-lined centrifugal pumps are widely used in the transportation of highly corrosive media such as sulfuric acid, hydrofluoric acid, and organic solvents due to the excellent corrosion resistance of PTFE/PFA linings. Mechanical seals are core components for leakage prevention, and their replacement quality directly affects the life and safety of the pump. This article takes three typical media, 98% sulfuric acid, 40% hydrofluoric acid, and mixed organic solvents, as examples to explain the key points of operation.   I. General preparations   1. Safety protection · Wear chemical protective clothing + mask (acidic medium) or organic solvent-resistant gloves (solvents) · Set up a "maintenance" warning sign and confirm that the power supply is double disconnected   2. Pre-processing · Close the inlet and outlet valves and drain the residual medium in the pump (sulfuric acid medium needs to be neutralized and rinsed with sodium carbonate solution) · Use a special fluoroplastic cleaner to wipe the pump cavity to avoid metal tools scratching the lining layer   II. Key points for medium differentiation operation   Case 1: 98% concentrated sulfuric acid medium pump · Special requirements: The sealing surface must be made of silicon carbide, and graphite rings are prohibited (sulfuric acid will cause graphite expansion and failure) · Disassembly tips: ① Loosen the middle bolt of the pump cover first to prevent sudden splashing of sulfuric acid crystals ② Check whether the shaft sleeve has pitting caused by sulfuric acid corrosion, and replace it simultaneously if necessary   Case 2: 40% hydrofluoric acid medium pump · Key steps: ① After disassembly, calcium gluconate gel is needed to neutralize residual fluoride ions ② The static ring must be filled with polytetrafluoroethylene, and the dynamic ring is recommended to be alumina ceramic   Case 3: Acetone/chloroform mixed solvent pump ·Precautions: ① Rubber #O-rings are prohibited, and perfluoroether rubber (FFKM) seals are used instead ② Thoroughly degrease with anhydrous ethanol before installation to prevent the solvent from dissolving the grease and contaminating the sealing surface   III. Standardized process for mechanical seal disassembly   1. Safety preparation stage ·Power off and lock (LOTO), and hang warning signs. ·Close the inlet and outlet valves and drain the medium in the pump (acid medium needs to be neutralized and flushed).   2. Coupling separation   ·Remove the protective cover bolts and use the puller tool to disassemble the coupling (cast iron impellers need to be padded with wooden blocks to prevent cracking)   3. Pump body disassembly ·Symmetrically loosen the pump cover bolts and pull out the motor and impeller assembly as a whole. ·Large pump bodies need to use the pump cover screw holes to push out the impeller   4. Removal of seal assembly   ·Remove the impeller nut with a socket wrench and pull out the impeller axially (threaded impeller needs to rotate counterclockwise)   ·First remove the dynamic ring assembly, and then use non-metallic tools to pry out the static ring (protect the O-ring)   IV. Key steps for mechanical seal installation   1. Pretreatment   ·Clean the shaft sleeve, sealing chamber and new seal with acetone   ·Check that there are no scratches on the mirror surface of the dynamic and static rings and no deformation of the spring   2. Installation of static ring   ·Press the static ring vertically into the sealing chamber to ensure that the anti-rotation pin is in the groove (clearance 0.1-0.2mm)   3. Assembly of dynamic ring   ·Apply silicone grease before the dynamic ring assembly is inserted into the shaft, and adjust the spring compression according to the manufacturer's standard   4. Reinstall the whole assembly   ·After the impeller is installed, manually turn the wheel to check that there is no friction sound   Tighten the pump cover bolts in diagonal order in batches (torque refers to GB/T 16823.1)   V. High-frequency operation risk tips   ·Acid medium pump: HF pump needs to be neutralized with calcium gel after disassembly, and graphite seal is prohibited for sulphuric acid pump ·Solvent pump: FFKM O-ring must be used, and ethanol degreasing must be performed before installation ·Common taboos: It is forbidden to knock on the end face of the static ring, and the dynamic ring should automatically rebound ≥3 times after compression   VI. Test acceptance standards   1. After the point-to-point test is correct, it should run continuously for 30 minutes 2. Leakage control: ·Water medium ≤5 drops/minute ·Corrosive medium ≤3 drops/minute   VII. High-frequency maintenance questions and answers   Q: Why is the double-end face machine seal more recommended for fluorine-lined pumps? A: Isolation fluid can be added to form a protective barrier, which is especially suitable for permeable media such as hydrofluoric acid Q: How to deal with vibration exceeding the standard after the machine seal is replaced? A: First check the dynamic balance of the impeller and the bending of the shaft, and then confirm that the verticality of the static ring installation is ≤0.05mm In summary, the replacement and maintenance of the mechanical seal of the corrosion-resistant pipeline pump is crucial to ensure the normal operation of the equipment. Users must not only master the correct replacement method, but also carefully follow the relevant precautions to extend the service life of the equipment and improve production efficiency.‌

In the chemical, metallurgical, mining and other industries, mortar pumps and magnetic pumps, as core equipment for conveying high-temperature corrosive media, have long faced pain points such as #seal failure, #material corrosion, and #particle wear. Especially when conveying media containing solid particles such as hydrochloric acid, hydrofluoric acid, and strong alkali, traditional mechanical sealing materials (such as alumina ceramics and tungsten carbide) often cause equipment downtime due to insufficient corrosion resistance or poor thermal shock resistance, resulting in huge maintenance costs. This article will analyze the performance advantages of #pressureless sintered silicon carbide (SSIC) materials and explore how it can become the ultimate sealing solution under high-temperature corrosive conditions. Ⅰ. Extreme Challenges of High-Temperature Corrosive Conditions to Sealing Materials 1.1 Typical Failure Scenarios #Mortar Pump: When conveying corrosive slurry with 60% solid content (such as acidic slurry with pH < 2), grooves are formed on the sealing surface due to #abrasive wear and #chemical corrosion, resulting in leakage exceeding the industry warning value of 20mL/h. #High-Temperature Magnetic Pump: When the medium temperature exceeds 180°C, the traditional sealing ring deforms due to the difference in thermal expansion coefficient (such as #tungsten carbide CTE≈5.5×10⁻⁶/°C), causing the sealing surface to be uneven, resulting in the magnetic pump #isolation sleeve rupture or #bearing jamming.     1.2 Performance bottlenecks of traditional materials Ⅱ. Breakthrough performance of pressureless sintered silicon carbide 2.1 Material science advantages Extreme corrosion resistance: The corrosion rate in boiling concentrated hydrochloric acid (37% HCl) is <0.02mm/year (NACE TM0177 standard), and it can operate stably in the full range of pH=0~14, perfectly matching the high chloride medium working conditions of mortar pumps. #High temperature stability: It still maintains a bending strength of >300MPa at 1600℃ (ASTM C1161 test), and the thermal conductivity reaches 120W/m·K (4 times that of #316L stainless steel), which significantly reduces the risk of thermal stress cracking of magnetic pumps under high temperature conditions. #Nano-level sealing surface‌: Through HIP (hot isostatic pressing) densification process, the porosity is <0.1%, the surface roughness Ra≤0.1μm (ISO 4287 standard), and the leakage rate is less than 0.01mL/m·h, which meets the requirements of API 682 Plan 53B sealing system.   2.2 Engineering application verification #Mortar pump case‌: After a copper smelter upgraded the original alumina ceramic seal to SSiC mechanical seal, when conveying #copper concentrate slurry containing 35% H₂SO₄ and 40% solid content, the service life was increased from 42 days to 18 months, saving more than 1.2 million yuan in maintenance costs each year. #Magnetic pump case‌: In the ethylene cracking unit of a petrochemical enterprise, the SSiC seal operated continuously for 26,000 hours without leakage under 320℃ hot oil medium, extending the service life by more than 6 times compared with the traditional solution.   III. Guide to key technical parameters for selection   For different pump types, the following optimized configuration is recommended: IV. Industry Development Trends According to the Grand View Research report, the global #silicon carbide mechanical seal market size will reach US$1.78 billion in 2023, of which the pressureless sintering process accounts for 62%. With the surge in demand for #‌corrosion-resistant magnetic pumps‌ and #‌wear-resistant mortar pumps‌ in emerging fields such as third-generation semiconductor manufacturing and lithium battery slurry delivery, SSiC mechanical seals are becoming the default choice for engineers to cope with extreme working conditions. Conclusion‌ Whether facing the #‌abrasion-corrosion coupling working conditions‌ of mortar pumps or the #‌high temperature and high pressure sealing challenges‌ of #magnetic pumps, pressureless sintered silicon carbide materials have shown disruptive performance breakthroughs. It is recommended that equipment manufacturers focus on the porosity (needed to be <0.5%) and crystal phase purity (β-SiC accounts for >95%) of SSIC when selecting, and jointly conduct ASTM G65 wear simulation tests with seal suppliers to maximize the equipment MTBF (mean time between failures).

CHANGYU's flagship product #Fluorine-lined corrosion-resistant and wear-resistant mortar pump : the ultimate anti-corrosion and wear-resistant solution in the chemical industry in the global chemical, metallurgical, environmental protection and other industries, equipment corrosion and wear problems cause economic losses of up to tens of billions of dollars each year. As a leading company in the field of anti-corrosion pumps, Changyu Pumps and Valves has successfully broken the monopoly of international brands with its independently developed fluorine-lined corrosion-resistant and wear-resistant mortar pumps, and has become the preferred solution in the fields of petrochemicals, flue gas desulfurization, and electroplating wastewater treatment.   ⅠWhy has the fluorine-lined, #corrosion-resistant and wear-resistant mortar pump become a rigid demand in the industry?   According to Grand View Research, the global chemical pump market will reach $68.5 billion in 2023, of which #corrosion-resistant pumps account for more than 40%, with an annual growth rate of 8.3%. Traditional metal pumps generally have problems of short life and high maintenance costs when facing strong acids (such as sulfuric acid and hydrochloric acid), strong alkalis, and media containing solid particles. For example:   ①: A phosphate fertilizer plant used a cast iron pump to transport slurry containing 30% phosphoric acid. The impeller was perforated in just 3 months, and the replacement cost exceeded 120,000 yuan/year; ②: The desulfurization system of a coastal power plant used a #316L stainless steel pump, which frequently shut down due to chloride ion corrosion, affecting power generation efficiency.   ⅡThe core technical advantages of CHANGYU #fluorine-lined pump   ①：Quadruple protection technology, lifespan increased by 5-8 times Lining material: modified #fluorinated ethylene propylene (FEP) material, with a thickness of 8-10mm, a temperature range of -85℃~150℃, and can withstand strong corrosive media such as 98% concentrated sulfuric acid and hydrofluoric acid (key technology for chemical pump selection); ·Wear-resistant structure: The impeller adopts a semi-open design + back auxiliary blades to reduce particle blockage; the surface hardness of the flow-through parts reaches HRC65, which is 3 times more wear-resistant than traditional rubber linings; ·Patented seal: Containerized double-end mechanical seal (API 682 standard), equipped with PLAN54 flushing system, leakage rate <0.1ml/h; ·Modular design: The pump body and bearing bracket are standardized, and the maintenance time is shortened by 70%.   ②：Measured performance comparison   Ⅲ Classic application scenarios and customer cases ①：Flue gas desulfurization system (working principle of desulfurization pump) ·Customer: A nickel smelter in Indonesia ·Working conditions: Processing desulfurization slurry containing 15% gypsum, pH=2.5, temperature 80℃ ·Solution: Configure #200UHB-ZKD-350-32 fluorine-lined pump, flow rate 350m³/h, head 32m ·Effect: Continuous operation for 18 months without major repairs, energy consumption reduced by 22%, replacing the original American brand pump   ②：Electroplating wastewater reuse  ·Customer: A circuit board company in Guangdong ·Problem: Chromium-containing wastewater caused corrosion and leakage of 304 stainless steel pump within 3 weeks ·Renovation plan: Use CHANGYU #50UHB-ZKD-20-30 small fluorine-lined pump, equipped with #frequency conversion control ·Results: Wastewater recovery rate increased from 60% to 92%, saving more than 800,000 yuan in annual reagent costs   Ⅳ Selection Guide: How to match the best working conditions?   ①: Customers should pay attention to the following when purchasing fluorine-lined pumps:   · Medium characteristics: pH value, temperature, solid content (core parameters for mortar pump selection); · Flow head: It is recommended to reserve 10%~15% margin (refer to HI 9.6.7 specification); · Quality certification: ISO or CE quality certification is required; · Service support: CHANGYU provides free quotation + selection plan + model + structure diagram.   ②: As of 2024, Changyu Pumps and Valves has provided more than 120,000 fluorine-lined equipment to the world, thanks to:   · Technical barriers: 17 invention patents, participated in the drafting of the national standard "#Corrosion-resistant Plastic Centrifugal Pump"; · Data verification: (mean time between failures) test up to 28,000 hours;   If you need a customized solution, please contact the CHANGYU engineer team - let corrosion and wear become history, starting with choosing a real ace pump.