Screw stability verification: known load 100KN, stroke 500mm, speed 60mm/min, no guide rail, usage coefficient 1.5, low operating frequency, calculated model For (Heavy Duty Electric Linear Actuator model SCA200-V1-500-FL-P2):

lifting Screw specification Tr80*12

1. Known conditions

Load F=100KN=100,000N

Stroke S=500mm

Speed v=60mm/min

Usage coefficient K=1.5

Screw specification Tr80*12 (diameter 80mm, pitch 12mm)

2. Analysis of screw force

The screw mainly bears the axial load, so we need to calculate the stress of the screw under the axial load.

• Screw diameter d=80mm=0.08m

•Screw cross-sectional area A=π (2d)2= π(20.08)2=0.005027㎡

•Axial load Fax=K*F=1.5×100,00N=150,000N

3. Calculation of screw stress

Screw stress o =AFax=0.00502715000=2983866.67Pa

4. Check the stability of the screw

For the stability of the screw, we mainly pay attention to whether it will flex. Since the screw is usually installed on the fixed bracket and its length is relatively short (500mm), the possibility of buckling is relatively small. However, in order to evaluate more accurately, we can use Euler's formula to estimate the critical bending load of the screw.

1. Screw length=500mm=0.5m

2. The elastic modulus of the screw material E (set to steel, E≈210GPa=210×109Pa)

3. Screw moment of inertia I=π 64d4= π64×(0.08)4=2.01062×10-7m4

Eular critical load Fcr can be calculated by the following formula:

Fcr=12 π2EI=(0.5)2π 2×210×109×2.01062×10-7=2,649,444.44N

Because Fax=150,000N＜Fcr=2,649, 444.44N, the screw is stable under axial load.

5. Summary
After calculation, it is confirmed that the screw (specification is Tr80*12) equipped with the linear actuator model SCA200-V1-500-FL-P2 is at a load of 100KN, stroke of 500mm, speed of 60mm/min, and a coefficient of use of 1.5 And the linear actuator is stable under the condition of low working frequency.

The transmission ratio of a worm gear screw lift (often just called a worm gear) refers to the ratio between the number of turns the worm (the driving gear) makes for one complete revolution of the worm wheel (the driven gear). This ratio dictates how much mechanical advantage is gained through the system, and also influences the speed reduction and torque increase.

Factors Related to the Transmission Ratio:

1. Lead of the Worm:

   • The lead is the distance the nut (or worm wheel) moves along its axis per one complete revolution of the worm. It plays a direct role in the transmission ratio.
   • A higher lead results in a faster movement of the worm wheel, but with a higher mechanical advantage (lower ratio) as the gear ratio is influenced by how far the worm travels per turn.

2. Number of Teeth on the Worm Wheel:

   • The number of teeth on the worm wheel relative to the number of threads on the worm also affects the ratio.
   • In general, the more teeth on the worm wheel relative to the worm, the lower the transmission ratio.

3. Number of Threads on the Worm:

   • Worms can have one or more threads (called single-start or multi-start worms).
   • A multi-start worm will reduce the transmission ratio, as each turn of the worm moves the worm wheel by a larger distance.

4. Pitch of the Worm:

   • The pitch (distance between adjacent threads) also influences the ratio. A finer pitch (smaller thread spacing) typically results in a higher transmission ratio.

5. Friction and Efficiency:

   • Worm gears have a high frictional contact between the worm and the worm wheel, which can influence the effective transmission ratio, especially at higher loads.
   • Efficiency is typically lower in worm gears compared to other types of gears, which can cause some discrepancy between the theoretical and actual ratio.

How to Calculate the Transmission Ratio:

The transmission ratio can be calculated using the following formula:

Where:

• $Z_w$ = Number of teeth on the worm wheel.
• $Z_s$ = Number of starts (threads) on the worm.

Example:

If the worm wheel has 40 teeth and the worm has a 2-start thread, the transmission ratio would be:

This means for each full rotation of the worm, the worm wheel will turn 1/20th of a rotation.

Additional Considerations:

• Self-locking feature: Worm gears often have a self-locking property, where the worm can drive the worm wheel but the worm wheel cannot drive the worm. This property comes into play in applications like screw lifts where load holding is important.

Regardless of whether it is a standard electric linear actuator, a small-sized actuator, or even a micro actuator, these devices have seen strong development and application across various industries. One common aspect of their use is their significant role in the renewable energy sector. Here, we will focus on the development of electric actuators in the field of photovoltaic (PV) power generation.

1. Reasons for Applying Electric Actuators in the Photovoltaic Industry
The idea of using electric linear actuators in PV systems emerged due to the high cost of solar panels, which greatly limited the widespread adoption of such products. Under these circumstances, there was a strong need for alternative products, leading to further development of electric electric linear actuators.

2. Development of Electric Actuators in the PV Industry
From the early stages of technology to the present day, photovoltaic power generation has evolved from expensive solar cells to more cost-effective polycrystalline silicon cells, with a significant expansion in application fields. During this process, the use of components has also changed. In the past, fixed brackets were mostly used in power generation systems. However, the current trend has shifted toward actuator-based tracking systems.

3. Recognition of Electric Actuators in the PV Industry
Due to the high efficiency and stability of actuator-based tracking systems, they have received widespread recognition from both the government and industry peers. This has further encouraged investment in this area, ushering in a promising period of development for electric linear actuator tracking systems.

4. Categories of Electric Actuator-Based PV Tracking Systems
This power generation model can be broadly classified into two main types: single-axis linked tracking systems and dual-axis tracking systems. Regardless of the type, electric linear actuators serve as the driving force for these tracking systems. Because of this, strict requirements are placed on their service life—they must match the lifespan of the solar panels in order to maximize the overall efficiency of the PV power generation system.

The gear ratio (also called the transmission ratio) of a worm gear screw jack refers to the ratio between the rotational speed of the worm and the rotational speed of the screw, usually expressed as the ratio of the worm's speed to the screw's speed. The gear ratio directly affects the speed and output torque of the screw jack.

Meaning of Gear Ratio:

Definition of Gear Ratio:
The gear ratio (Transmission Ratio) is the transmission ratio between the worm wheel and the worm, usually represented by the ratio of the number of teeth on the worm wheel to the number of threads on the worm. For example, if the worm wheel has 50 teeth and the worm has 10 threads, the gear ratio would be 5:1.

Impact on Speed:
The gear ratio determines the relationship between the rotational speed of the worm and the screw. The larger the gear ratio, the slower the worm's speed and the slower the screw's lifting speed. Therefore, a higher gear ratio will slow down the screw's movement, which is suitable for applications requiring precise control. A lower gear ratio will result in faster screw movement, which is suitable for quick lifting needs.

Impact on Torque:
The larger the gear ratio, the greater the torque transmitted from the worm to the screw. In cases of heavy loads, a larger gear ratio can provide higher output torque, allowing the jack to support heavier loads.

• Low Gear Ratio (e.g., 1:1 or 3:1) typically provides higher speed but lower output torque, making it suitable for light load, high-speed applications.

• High Gear Ratio (e.g., 10:1 or 20:1) provides greater torque, making it suitable for applications requiring higher load capacity and precision, but with slower speed.

Gear Ratio and Application Scenarios:

Higher Gear Ratio (e.g., 20:1, 30:1):

• Suitable for high-load, low-speed applications. Due to lower speed, it provides greater torque, making it ideal for heavy-duty equipment or precision-controlled applications, such as precision lifting platforms and large machinery.

• Typical Applications: Lifting platforms, heavy-duty cranes, precision machinery.

Lower Gear Ratio (e.g., 3:1, 5:1):

• Suitable for light-load, high-speed applications. Due to the smaller gear ratio, the speed is higher, but the torque is lower, making it suitable for applications that require faster movement but are not designed for heavy loads.

• Typical Applications: Light-duty conveyor systems, automated production lines, etc.

Impact of Gear Ratio on Self-locking Performance:

Worm gear screw jacks often feature a self-locking function, meaning that when the worm stops turning, the friction generated by the engagement between the worm and the worm wheel prevents the load from automatically sliding down. When the gear ratio is larger, the self-locking ability is stronger, because the engagement angle between the worm and the worm wheel is greater, making it more difficult for the load to move in the opposite direction.

The load capacity of servo electric cylinders cannot be very high mainly due to the following reasons:

4. Efficiency issues: High loads can reduce the operational efficiency of the electric cylinder, causing increased heat generation. Excessive load may also affect the effectiveness of the cooling system, raising the system temperature and shortening the lifespan of the electric cylinder.

Therefore, when selecting a servo electric cylinder, it is essential to choose a model that matches the specific application requirements. Ensuring the load remains within the design limits of the cylinder is critical to avoid overload and ensure reliable operation.

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.

Stainless steel has become one of the most commonly used materials in pump manufacturing due to its excellent corrosion resistance and mechanical properties. This article focuses on the application of several common stainless steel materials in pumps, analyzes their chemical composition differences, mechanical performance characteristics and applicable working conditions, and provides a reference for users to select models.

1. "The most familiar friend": 304 stainless steel (06Cr19Ni10)

Chemical composition and characteristics

304 stainless steel is the most commonly used austenitic stainless steel, and its typical chemical composition is:

· Chromium (Cr): 18-20%

· Nickel (Ni): 8-10.5%

· Carbon (C): ≤0.08%

· Manganese (Mn): ≤2.0%

· Silicon (Si): ≤1.0%

· Phosphorus (P): ≤0.045%

· Sulfur (S): ≤0.03%

a、Mechanical properties

·Tensile strength: ≥515 MPa

·Yield strength: ≥205 MPa

·Elongation: ≥40%

·Hardness: ≤201 HB

b、Applicable working conditions

304 stainless steel has good corrosion resistance and formability, and is suitable for:

·General corrosive media: such as dilute nitric acid, organic acids, etc.

·Temperature range: -196℃ to 800℃ (short term)

Due to the properties of 304 stainless steel, it is commonly used in: drinking water systems, food processing, and chemical industries for the transportation of weakly corrosive media.

c. 304 stainless steel has limitations in use

·Not resistant to chloride corrosion (such as seawater and salt water)

·Prone to stress corrosion cracking in sulfur-containing environments

2. "A Warrior Who Rejects Corrosion": 316 Stainless Steel (06Cr17Ni12Mo2)

Chemical Composition and Characteristics

316 stainless steel is an upgraded version of 304, with the addition of molybdenum:

· Chromium (Cr): 16-18%

· Nickel (Ni): 10-14%

· Molybdenum (Mo): 2-3%

· Carbon (C): ≤0.08%

The remaining elements are similar to 304, and the corrosion resistance is greatly improved.

a、Mechanical properties

·Tensile strength: ≥515 MPa

·Yield strength: ≥205 MPa

·Elongation: ≥40%

·Hardness: ≤217 HB

b、Applicable working conditions

Compared to 304 stainless steel, 316 has better corrosion resistance due to the addition of molybdenum:

· Chloride environment: more resistant to seawater and salt water corrosion than 304

· Strong acid environment: better resistance to sulfuric acid, phosphoric acid, etc.

· Temperature range: -196℃ to 800℃ (short term)

Therefore, it is commonly used in: moderately corrosive media in seawater desalination, pharmaceutical, and chemical industries

c、Advantages

·Higher pitting equivalent PREN value (about 25, 304 is about 19)

·More resistant to crevice corrosion and stress corrosion cracking

3. "Special Forces Specialized in Solving Difficult Problems": 316L Stainless Steel (022Cr17Ni12Mo2)

Chemical Composition and Characteristics

316L is an ultra-low carbon version of 316:

Carbon (C): ≤0.03% (significantly lower than 0.08% of 316)

The remaining components are basically the same as 316

a、Mechanical Properties

·Tensile Strength: ≥485 MPa

·Yield Strength: ≥170 MPa

·Elongation: ≥40%

·Hardness: ≤217 HB

b、Applicable Working Conditions

The low carbon content makes it more suitable for:

·Welding applications: reduce carbide precipitation in the heat affected zone of welding

·High temperature corrosion environment: more resistant to intergranular corrosion in the range of 450-850℃

·Highly corrosive media: such as concentrated nitric acid, organic acids, etc.

c、Common Applications

Nuclear industry, fine chemicals, high temperature corrosion environment

d、Special Advantages

·No annealing required after welding

·More stable in long-term high temperature environment

4. "The Smooth Socialite": Duplex Stainless Steel 2205 (022Cr23Ni5Mo3N)

Chemical Composition and Characteristics

Duplex stainless steel has both austenite and ferrite structures:

· Chromium (Cr): 22-23%

· Nickel (Ni): 4.5-6.5%

· Molybdenum (Mo): 3.0-3.5%

· Nitrogen (N): 0.14-0.20%

· Carbon (C): ≤0.03%

a、Mechanical Properties

· Tensile Strength: ≥620 MPa

· Yield Strength: ≥450 MPa (significantly higher than austenitic stainless steel)

· Elongation: ≥25%

· Hardness: ≤290 HB

b、Applicable working conditions

2205 duplex stainless steel is particularly suitable for:

·High chloride environment: high concentration chloride solutions such as seawater and brine

·High stress environment: applications requiring high strength

·Environment where corrosion and wear coexist: such as media containing solid particles

·Temperature range: -50℃ to 300℃

·Common applications: offshore oil platforms, chemical process pumps, desulfurization systems

c、Outstanding features of 2205 duplex stainless steel

·PREN value up to 35-40

·Excellent resistance to stress corrosion cracking

·Good wear resistance and fatigue strength

5. "Challenger in extreme environments": Super austenitic stainless steel 904L (015Cr21Ni26Mo5Cu2)

Chemical composition and characteristics

Super austenitic stainless steel with high alloy content:

· Chromium (Cr): 19-23%

· Nickel (Ni): 23-28%

· Molybdenum (Mo): 4-5%

· Copper (Cu): 1-2%

· Carbon (C): ≤0.02%

a、Mechanical properties

· Tensile strength: ≥490 MPa

· Yield strength: ≥216 MPa

· Elongation: ≥35%

· Hardness: ≤220 HB

b、904L applicable working conditions

904L is suitable for extremely corrosive environments:

1. Strong acid environment: concentrated sulfuric acid, phosphoric acid, etc.

2. Complex mixed media: media containing multiple corrosive components

3. High temperature corrosive environment: up to 400℃

Because of these characteristics, 904L is commonly used in: chemical industry strong corrosive media transportation, flue gas desulfurization system, pharmaceutical industry, etc.

c、Special advantages

·Good corrosion resistance to both reducing and oxidizing media

·Excellent resistance to pitting and crevice corrosion

6. Purchase considerations

1. Medium characteristics: pH value, chloride ion content, oxidizing/reducing properties

2. Temperature range: operating temperature and fluctuation range

3. Mechanical requirements: pressure, flow rate, whether it contains solid particles

4. Economic efficiency: balance between initial cost and service life

Buyers can consult the manufacturer or make inquiries based on this information.

7. Scope of application and application recommendation

8.Conclusion

The selection of stainless steel materials for pumps requires comprehensive consideration of media characteristics, working environment and economic factors. The 304/316 series is suitable for most general corrosive environments, titanium-stabilized stainless steel is suitable for high-temperature applications, and duplex stainless steel and super austenitic stainless steel are for more demanding working conditions. The correct material selection can not only extend the service life of the stainless steel pump, but also reduce maintenance costs and ensure safe and stable operation of the system. It is recommended that users consult professional technicians when selecting and make a decision after a detailed working condition analysis.

Stainless steel high temperature magnetic pumps (high temperature magnetic pumps, corrosion resistant magnetic pumps) are widely used in chemical, pharmaceutical, electroplating and other industries. Their leak-free, high temperature and corrosion resistant characteristics make them an ideal choice for conveying hazardous media. This article provides a detailed magnetic pump selection guide, covering the comparison of pump types under different working conditions (such as high temperature, strong acid, and medium containing particles).

1. Pump type selection under different media and temperature conditions [Stainless steel magnetic pump, chemical pump selection]

Stainless steel high-temperature magnetic pumps are widely used in chemical, pharmaceutical, electroplating and other industries due to their excellent corrosion resistance and high temperature resistance. For different working conditions and media, the following factors should be considered when selecting:

①. Medium characteristic selection [acid and alkali resistant pump, high-temperature medium transportation]

·Corrosive media: Select 316L or 904L stainless steel material, 904L has better tolerance to strong acids and alkalis.

·High-temperature media: Standard type can be selected below 200℃, and high-temperature special type needs to be selected for 200-350℃.

·Particle-containing media: Standard type can be selected for particle content <5%, wear-resistant type or larger gap design needs to be selected for >5%.

·Easy to crystallize media: Models with insulation jackets should be selected to prevent the medium from crystallizing in the pump.

②. Comparison of working conditions of magnetic drive pump and leakage-free pump

2. Detailed explanation of technical parameters of mainstream models [Magnetic pump parameters Pump performance curve]

①. Models and parameters of chemical pumps such as CQB and IHF

②. Key performance parameters

·Flow rate: Select according to process requirements, it is recommended to leave a 10-15% margin

·Lift: Consider pipeline loss and vertical lifting height

·Temperature: The actual working temperature should be lower than the rated temperature of the pump by more than 20°C

·Power: Adjust according to the specific gravity and viscosity of the medium, high viscosity medium requires increased power.

3. Professional selection steps and usage suggestions

①. Five-step selection method

· Clearly define the characteristics of the medium: including composition, concentration, temperature, viscosity, particle content, etc.

· Determine process parameters: flow, head, inlet and outlet pressure, etc.

· Select materials: Select the appropriate stainless steel grade according to the corrosiveness of the medium

· Consider special needs: such as explosion-proof, aseptic, wear-resistant and other special requirements

· Check supporting equipment: motor power, cooling system, control system, etc.

②. Key points for the use and maintenance of magnetic pumps

· Installation: Ensure that the inlet has sufficient net positive suction head (NPSHa)

· Before starting: The pump must be primed and dry operation is strictly prohibited

· During operation: Monitor the bearing temperature, which should not exceed the ambient temperature +70℃

· Shutdown maintenance: The medium should be drained for long-term shutdown to prevent crystallization or corrosion

③. Common selection errors

· Ignoring the impact of medium temperature changes on pump performance

· Underestimating the pipeline resistance and resulting in insufficient head

· Ignoring the correction of medium viscosity to pump performance

· Selecting too large a safety margin leads to energy waste

Through the above guidelines, users can choose the most suitable stainless steel high-temperature magnetic pump model according to specific working conditions and medium characteristics to ensure long-term stable operation of the equipment and improve production efficiency. It is recommended to consult professional technicians or pump manufacturers before the final selection to obtain more accurate selection suggestions.