What is Pleastic Lining?

The Plastic lining of the Some Special Chemical tank is to enhance the corrosion resistance and chemical resistance by coating the inner wall of the tank with plastic material to form a protective film. The following are the specific steps of chemical tank's pleastic lining:

1. Preparation Work

• Check the status of tank : Before the cleaning process, check whether the tank has cracks, deformation or corrosion.

• Cleaning the surface of tank : First of all, clean the outside of the tank to remove surface oil, rust, dirt and other impurities on it.

• For the inner wall of the tank: Remove the accumulated residue, corrosion products and moisture. Wire brushes, sandpaper or sandblasting are the good tools. When cleaning, you can use appropriate solvents (such as alcohols, ethers or industrial cleaning agents).

2. The treatment of surface

• Roughening: To improve the adhesion between the lining layer and the surface of the tank. This can be achieved by sandblasting, mechanical grinding or other methods.

• Degreasing: Use the appropriate degreasing agent to degrease, which ensure that there is no oil or other impurities on the surface, assure the plastic layer can adhere evenly.

• Keep drying: Before lining, ensure that the inner is dry to prevent moisture from affecting the adhesion of the plastic lining.

3. Choose Suitable ining materials:

• The kinds of lining materials: In the common, lining materials include epoxy resin, polyethylene (PE), polypropylene (PP), fluoroplastics, etc. Select appropriate lining materials by the properties of the chemicals in the tank (such as acidity, alkalinity, temperature, pressure, etc.).

4. Applying lining methods

• Brushing: For coating of small areas or details.

• Spraying: For uniform coating of large areas, and which required professional spraying equipment.

• Dip coating: Achieved by dipping the inside of the tank into the coating.

• Coating thickness: Ensure that the thickness of the lining layer is uniform. Depending on the using environment, multiple layers of lining materials may need to be applied, usually two or three layers.

5. Curing and heating

• Natural curing: Let the finised tank stand for a period of time (usually 24 to 48 hours) to allow the coating to cure naturally at room temperature.

• Heat curing: For some special materials, heat curing is performed by raising the temperature to a certain temperature (usually 120°C to 160°C). The curing time depends on the coating thickness and material properties.

6. Check the quality after lining

• Check the uniformity: Ensure that the plastic lining is uniform and has no defects, and no missing coating, bubbles, cracks, etc.

• Adhesion test: Check the adhesion between the plastic lining and the metal surface by pull-off test, scrape test and other methods.

• Thickness measure: Use special instruments to measure the thickness of lining to ensure it to meet the standards.

7. After lining-processing

• Cleaning and repair: Repaired it if the coating has defects . Small cracks or bubbles can be repaired by re-coating.

• Ventilation: If there is solvent or gas residue inside the tank during the plastic lining process, which avoid affecting the use or safety of the tank.

8. Testing

• Hydraulic or air pressure test: To check for leakage, Perform water or air pressure test. Through the test, it can be ensured that the plastic lining layer can withstand normal working pressure.

• Chemical resistance test: Test the chemical resistance to ensure that the tank can effectively prevent corrosion from chemicals.

The process of pleastic lining chemical tanks includes multiple steps, which requiring delicate operation and suitable material. Each step needs to be carried out strictly to ensure that the lining layer has good adhesion, corrosion resistance and durability, which can ensure the safe use of the tank and the safe storage of chemicals.