What parameters should be considered when selecting acid resistant pumps in Dalian?

Dalian acid resistant pump is a type of pump equipment specifically designed for transporting acidic media, widely used in industries such as chemical, pharmaceutical, electroplating, metallurgy, etc. Due to the strong corrosiveness of acidic media, multiple parameters need to be comprehensively considered when selecting to ensure the performance, service life, and safety of the pump. The following are the main parameters to consider when selecting acid resistant pumps:

1. Characteristics of the medium

The characteristics of the medium are the first factors to consider when selecting, which directly determine the material and structure of the pump.

PH value: The lower the pH value of acidic media, the stronger the corrosiveness, and it is necessary to choose materials with higher corrosion resistance.

Medium composition: The chemical composition of the medium (such as sulfuric acid, hydrochloric acid, nitric acid, etc.) has a significant impact on the material selection of the pump. Different acids have different corrosivities to materials, and suitable materials need to be selected according to the specific medium.

Medium temperature: High temperature will accelerate the corrosion process, and high-temperature resistant materials and sealing forms need to be selected.

Medium concentration: The higher the concentration of acid, the stronger the corrosiveness, and a more corrosion-resistant material should be selected.

Medium viscosity: High viscosity media require the selection of suitable pump types and impeller designs to ensure conveying efficiency.

Particle content of the medium: If the medium contains solid particles, it is necessary to choose materials with strong wear resistance and consider the anti clogging design of the pump.

2. Material of the pump

The material selection of acid resistant pumps is crucial, and it needs to be reasonably chosen based on the corrosiveness and temperature of the medium.

Metal materials: Common metal materials include stainless steel (such as 304, 316L), Hastelloy, titanium alloy, etc. 316L stainless steel is suitable for most weak acid media, while alloys with higher corrosion resistance should be selected for strong acid or high temperature media.

Non metallic materials such as polypropylene (PP), polytetrafluoroethylene (PTFE), fluoroplastic (F46), etc. are suitable for strong acid media, but attention should be paid to their mechanical strength and temperature resistance.

Lining material: For certain special media, lining pumps can be used, such as rubber lining, ceramic lining, etc., to improve corrosion resistance.

3. Types of pumps

Select the appropriate pump type based on the characteristics of the medium and the requirements of the operating conditions.

Centrifugal pump: suitable for conveying acidic media with low viscosity, no particles or a small amount of particles, with the characteristics of high flow rate and moderate head.

Magnetic pump: Adopting an unsealed design, it is suitable for transporting highly corrosive media and avoiding leakage problems.

Diaphragm pump: suitable for conveying high viscosity, granular or easily crystallized acidic media, with strong self-priming ability and wear resistance.

Screw pump: Suitable for conveying acidic media with high viscosity and solid particles, it has the characteristics of stable flow rate and high pressure.

4. Flow rate and head

Flow rate and head are the basic parameters for pump selection, which need to be determined according to process requirements.

Flow rate (Q): refers to the volume of medium transported by the pump per unit time, and the appropriate flow range should be selected according to the process requirements.

Head (H): Refers to the height at which the pump can lift the medium, which needs to be calculated based on pipeline resistance, medium density, and transportation distance.

5. Working temperature

The working temperature directly affects the material selection and sealing form of the pump.

Low temperature medium: Low temperature resistant materials and sealing materials should be selected.

High temperature medium: It is necessary to choose materials and sealing forms that are resistant to high temperatures, such as metal bellows seals or high-temperature packing seals.

6. Sealing form

The choice of sealing form directly affects the reliability and service life of the pump.

Mechanical seal: Suitable for most working conditions, suitable sealing materials (such as silicon carbide, ceramics, polytetrafluoroethylene, etc.) need to be selected according to the characteristics of the medium.

Packing seal: suitable for low-pressure and low-speed working conditions, requiring regular maintenance.

Magnetic seal: suitable for highly corrosive media to avoid leakage problems.

7. Installation method

The installation method should be selected according to the site conditions and process requirements.

Horizontal installation: suitable for most working conditions, easy to install and maintain.

Vertical installation: Suitable for situations with limited space, but attention should be paid to the stability and vibration of the pump.

8. Operating environment

The operating environment also has a certain impact on the selection of pumps.

Environmental temperature: Suitable materials and sealing forms should be selected for high or low temperature environments.

Environmental humidity: For high humidity environments, materials with stronger corrosion resistance should be selected.

Explosion proof requirements: If the operating environment has explosion-proof requirements, explosion-proof motors and pump bodies should be selected.

9. Maintenance and Cost

When selecting, it is necessary to comprehensively consider the maintenance cost and service life of the pump.

Maintenance convenience: Choose pump types that are easy to maintain to reduce downtime and maintenance costs.

Initial and operating costs: Select pump types with high cost-effectiveness while meeting process requirements to avoid excessive design.

The selection of acid resistant pumps is a complex process that requires comprehensive consideration of multiple parameters such as medium characteristics, pump material, type, flow rate, head, working temperature, sealing form, installation method, operating environment, maintenance cost, and brand. Through scientific and rational selection, the efficient, safe, and long-life operation of acid resistant pumps in acidic medium transportation can be ensured, providing reliable guarantees for enterprise production.