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.

Caustic soda (sodium hydroxide) is an important raw material in the chemical industry, but its strong corrosiveness poses a challenge to transportation equipment. Traditional metal pumps are prone to corrosion and have a short lifespan, while fluoroplastic centrifugal pumps are an ideal solution due to their excellent corrosion resistance and reliability. This article focuses on analyzing their application advantages.

 

1. Challenges and industry pain points of caustic soda transportation

 

Caustic soda (sodium hydroxide) is a strong alkaline substance, which is extremely corrosive at a concentration of 30%-50%. According to the National Association of Corrosion Engineers (NACE), in the chemical industry, equipment damage caused by corrosion accounts for about 35% of all equipment failures, of which alkaline medium corrosion accounts for 18%. The service life of traditional 304/316 stainless steel pumps when conveying caustic soda is usually no more than 6 months, while cast iron pumps corrode faster.

 

Industry pain points are mainly manifested in:

 

· High costs caused by frequent equipment replacement

· Safety hazards caused by leakage risks

· Loss of production efficiency caused by downtime maintenance

· Medium pollution affects product quality

2. Core advantages and technical analysis of fluoroplastic centrifugal pumps

2.1 Excellent corrosion resistance

 

a. Fluoroplastic centrifugal pumps use PTFE (polytetrafluoroethylene) or PVDF (polyvinylidene fluoride) as the main material. Experimental data show:

 

·PTFE material has an annual corrosion rate of <0.01mm under 50% caustic soda concentration and 80℃

·PVDF material has an annual corrosion rate of <0.05mm under 40% caustic soda concentration and 60℃

Compared with stainless steel materials (annual corrosion rate>1mm), the corrosion resistance is improved by more than 100 times

 

b. Material selection guide:

 

·Normal temperature (<60℃), medium and low concentration (<30%): PVDF material has a higher cost performance

·High temperature (>60℃), high concentration (>30%): PTFE material is better

·PFA (soluble polytetrafluoroethylene) material can be considered for special working conditions

 

2.2 Advanced sealing technology

 

a. Fluoroplastic centrifugal pump adopts double-end mechanical seal system, with the following characteristics:

 

Seal life: up to 8000-10000 hours

 

Leakage rate: <0.5ml/h (much higher than API682 standard)

 

Auxiliary system: optional flushing, cooling and other devices

 

b. Sealing configuration recommendations:

 

Standard working conditions: single-end mechanical seal

 

Hazardous media: double-end mechanical seal + isolation liquid system

 

Particle-containing media: carbide sealing surface

 

2.3 Optimized hydraulic design

 

a. Through CFD fluid dynamics simulation optimization, modern fluoroplastic centrifugal pumps have the following features:

 

Efficiency improvement: 15-20% higher than traditional design

Energy consumption reduction: more than 30% energy saving under typical working conditions

NPSHr value: can be as low as 2m, effectively avoiding cavitation

 

b. Performance curve features:

 

Flat Q-H curve, suitable for flow fluctuation conditions

Wide high-efficiency zone, flow range of efficiency>75% up to 40%

Low specific speed design, suitable for high head requirements

 

3. Fluoroplastic centrifugal pump purchase guide

 

3.1 Comparison of well-known brands

3.2 Key parameters for purchase

Flow range: 0.5-500m³/h

Lift range: 5-80m

Temperature range:

PVDF: -20℃~90℃

PTFE: -50℃~150℃

Pressure level: PN6-PN16

 

3.3 Key points for supplier evaluation

Qualification certification: ISO9001, API685, etc.

Project cases: Application experience in the same industry

R&D capabilities: Number of patented technologies

After-sales service: Response time, spare parts inventory

 

4.Typical application cases 

  Case 1: A chlor-alkali enterprise in Hubei

 

Problem: The original stainless steel pump corroded and perforated in 3 months

Solution: Use PTFE-lined centrifugal pump

Effect: Extended service life to 4 years, reduced maintenance cost by 70%

 

Case 2: A pharmaceutical factory in Zhejiang

 

Requirement: Transport 40% NaOH, temperature 65℃

Selection: PVDF material, double-end seal

Operation data: Continuous operation for 18 months without failure

 

5. Maintenance and maintenance recommendations

 

a. Daily inspection:

Vibration value: <4.5mm/s (ISO10816 standard)

Bearing temperature: <75℃

Seal leakage: Visual inspection

 

a. Regular maintenance:

Every 2000 hours: Check the mechanical seal

Every 5000 hours: Replace the bearing lubrication Grease

Every year: comprehensive disassembly and inspection

c. Fault handling:

Flow rate drop: check impeller wear/blockage

Abnormal vibration: check alignment/bearing status

Seal leakage: check seal surface wear.

 

Sixth, industry development trend

a. Intelligent direction:

Equipped with IoT sensors to monitor operating status in real time

Predictive maintenance system to reduce unexpected downtime

 

b. Material innovation:

Nano-modified fluoroplastics to improve mechanical strength

Composite materials application to optimize cost performance

 

c. Energy efficiency improvement:

IE4 ultra-high energy efficiency motor matching

Continuous optimization of hydraulic model

 

Conclusion

Fluoroplastic centrifugal pumps have become the preferred equipment for conveying highly corrosive media such as caustic soda due to their excellent corrosion resistance, reliable sealing technology and high efficiency and energy saving. When choosing, it is recommended that users compare the technical characteristics and service capabilities of different brands according to specific working conditions and choose the most suitable products. With the advancement of materials science and manufacturing technology, fluoroplastic centrifugal pumps will play an important role in a wider range of chemical fields and provide strong guarantees for the safe and efficient operation of process industries.