Magnetic pumps, also known as magnetic drive pumps, are widely used in chemical, pharmaceutical, electroplating and other industrial fields. With its "zero leakage" design, it has become a star equipment for high-risk media transportation. This article introduces the advantages and disadvantages of magnetic pumps in detail to solve customers' purchase questions!

 

1. Advantages of magnetic pumps

1. "Zero leakage" design

The magnetic pump completely eliminates the traditional mechanical seal structure and uses a permanent magnetic coupling to achieve power transmission. Its core advantage is that it is particularly suitable for conveying highly corrosive, flammable, and explosive media.

 

2. Low operating cost

The magnetic pump uses a permanent magnetic structure, there is no contact and friction, the power consumption is small, and the energy consumption is reduced by 20-35%. Under the premise of the working conditions, it can significantly reduce the operating cost.

3. Long service life

Because the magnetic pump has no mechanical friction design, the bearing life is extended by 3-5 times, and the overall service life will be longer.

 

4. Excellent corrosion resistance

Optional materials include:

- Hastelloy C276 (resistant to 98% concentrated sulfuric acid)

- Polytetrafluoroethylene lining (resistant to hydrofluoric acid)

- Silicon carbide sealing surface (resistant to strong alkali)

 

II. Disadvantages of magnetic pumps

1. High initial investment cost. Due to the cost of accessories, the price of magnetic pumps is generally 2-3 times that of ordinary centrifugal pumps

 

2. Medium and temperature adaptability restrictions. Magnetic pumps should pay attention to the following on the medium: solid particle content must be less than 0.1%, viscosity must be less than 500cP, and the temperature range is -20℃～250℃ (special design can reach 350℃)

 

3. Low efficiency. Due to the limited size of impellers that can be used for magnetic pumps, the flow rate of magnetic pumps is usually lower than that of traditional centrifugal pumps, resulting in relatively low efficiency.

 

4. The magnetic pump and the motor are connected by a coupling. The coupling requires high precision in alignment. Improper alignment will cause damage to the bearing at the inlet and wear of the single-sided leakage prevention isolation sleeve.

 

3. Comparison table of key selection parameters

The "zero leakage" advantage of magnetic pumps in terms of safety and environmental protection makes them standard equipment for modern chemical production. Although the initial investment of magnetic pumps is relatively high, the comprehensive benefits brought by magnetic pumps are still very significant through the cost analysis of the entire life cycle such as environmental protection, safety, and energy saving. It is recommended that manufacturers select pumps reasonably according to actual working conditions when purchasing.

In the chemical industry, there are many types of liquid chemicals, including acids, alkalis, solvents, viscous liquids and corrosive media. The physical and chemical properties of these chemicals vary greatly. Choosing the right chemical pump is the key to ensuring safe, efficient production and durable equipment. In this article, Anhui Changyu Pump and Valve Manufacturing Co., Ltd. will introduce the various types of chemical pumps and their characteristics suitable for conveying different chemicals (such as nitric acid, hydrochloric acid, sulfuric acid, strong alkali, etc.) to help companies optimize equipment selection.

1.Main classification and characteristics of chemical pumps

Chemical pumps can be divided into the following categories according to their design and scope of application:

Centrifugal pump

Features: Suitable for liquids with low viscosity, no particles or a small amount of particles. Large flow rate and stable operation.

Application: Widely used for conveying water-based chemicals, dilute acids and alkalis.

Magnetic drive pump (magnetic pump)

Features: No mechanical seal, completely avoid leakage, suitable for volatile, flammable or highly corrosive media.

Application: Suitable for conveying strong acids (such as sulfuric acid, hydrochloric acid), strong alkalis, organic solvents, etc.

Gear pump

Features: Suitable for conveying high-viscosity liquids, stable flow rate and strong adaptability.

Application: Used to transport high-viscosity media such as lubricating oil, polymers, resins, asphalt, etc.

Diaphragm pump

Features: It adopts diaphragm design, can be used for highly corrosive or particulate chemicals, and has self-priming ability.

Application: Suitable for transporting complex media such as strong acids, strong alkalis, coatings, mud, etc.

Screw pump

Features: Suitable for transporting high-viscosity, uniform liquids, stable operation and low noise.

Application: Used to transport viscous liquids, emulsions and certain special chemicals.

Self-priming pump

Features: It has self-priming function and is suitable for extracting media with low liquid level.

Application: Used in sewage treatment, solvent transportation and other occasions.

 

2. Select chemical pumps according to chemical characteristics

 

Acidic chemicals (such as sulfuric acid, hydrochloric acid, phosphoric acid)

Challenge: Acidic media are highly corrosive and have extremely high requirements for pump body materials.

Recommended pump type:

Magnetic pump: Use corrosion-resistant materials such as fluoroplastics and stainless steel to avoid leakage and corrosion.

Diaphragm pump: The diaphragm material can be selected from Teflon (PTFE), which is resistant to strong acids.

Chemical centrifugal pump: Use alloy or highly corrosion-resistant materials.

Alkaline chemicals (such as sodium hydroxide, ammonia)

Challenge: Strong alkaline media are corrosive to the pump body and seals, and alkali-resistant materials must be selected.

Recommended pump type:

Magnetic pump: alkali-resistant design to avoid contact leakage.

Diaphragm pump: suitable for conveying medium and high concentration alkali liquid.

 

Organic solvents (such as toluene, acetone, ethanol)

Challenge: Solvents are volatile and flammable, have high requirements for sealing, and have a dissolving effect.

Recommended pump type:

Magnetic pump: no mechanical seal, eliminate the risk of leakage.

Stainless steel gear pump: used for high viscosity solvent delivery.

Chemical self-priming pump: used for low liquid level solvent delivery.

 

High viscosity chemicals (such as resins, polymers, greases)

Challenge: High viscosity, poor fluidity, ordinary pumps are prone to clogging or low efficiency.

Recommended pump type:

Screw pump: stable delivery of high viscosity liquids, strong adaptability.

Gear pump: suitable for constant flow, high viscosity media.

Medium containing solid particles (such as mud, suspension, coating)

Challenge: Solid particles may cause wear or clogging of the pump body.

Recommended pump type:

Diaphragm pump: suitable for media with high solid content and strong wear resistance.

Slurry pump: specially designed for conveying high-concentration granular media.

High-temperature chemicals (such as hot oil, molten sulfur)

Challenge: High temperature places high demands on the heat resistance of pump body materials and seals.

Recommended pump type:

High-temperature resistant centrifugal pump: made of heat-resistant alloy materials, suitable for high-temperature fluids.

Gear pump: suitable for high-temperature oil transportation to avoid failures caused by thermal expansion.