Anticorrosion of underground water tank and accessories
The underground water tank and its accessories shall be treated with anti-corrosion in strict accordance with the design requirements.
The underground water tank anticorrosion construction, according to the design selection of the following practices: thick slurry type epoxy coal asphalt coating.
Epoxy coal pitch coating is a, b two-component coating, by the primer of the group a and group b points (curing agent) and the top paint of the group a points plus group b points (curing material) composition, and add the corresponding thinner matching composition.The quality index of epoxy coal pitch paint must meet the inspection requirements of G(B1720~GB1763).
Construction requirements:
Surface treatment: surface treatment has a great impact on the life of the film. In order to increase the life of the film, strict surface treatment is necessary to achieve the best results. Epoxy coal tar tar paint in principle requires that the surface of steel coated with sand blasting (or shot blasting) derusting, up to all white or nearly all white grade. There is no oil and dust on the surface before brushing. If limited to conditions, manual steel wire brush and emery cloth can also be used to carefully remove rust.
To brush on the surface of the large weld tumor edges and corners, burrs, etc. To remove or guide Angle.
He preparation of paint: before use should be stirred evenly. It is prepared by professional personnel according to the requirements specified in the product manual. The paint should be used up within the specified time limit.
Primer coating should be uniform, do not leak coating, generally dry surface can be coated, at room temperature should not exceed two days, too long time will affect the adhesion with the finish, if it has been fully cured, available after sandpaper wool, and then coat. When brushing all layers of paint, the interval interval time is as good as dry film surface. For wrapping glass filament cloth, it should be carried out at the same time as finishing paint, so as to make glass filament cloth soaked in paint.
Before the pipeline is under the ditch, the leakage shall be detected by the electric spark leak detector throughout the line according to the thickness of the anticorrosion layer. If any defects are found, the leakage shall be filled.
Anticorrosion of underground water tank inner wall
- Surface treatment of steel plate
Strict surface treatment is the primary factor that determines the life of steel structure coating. If the surface treatment fails to meet the technical requirements, the adhesion between the coating and the base metal will be affected. Thus, it is impossible to guarantee the anti-corrosion life of the design.
- Surface treatment before sandblasting (new steel)
Use appropriate cleaning agent to remove oil, grease and other contaminants on the surface, clean with (high pressure) fresh water to remove salt and other contaminants, after drying, pass the inspection, sand blasting.
- Environmental conditions of sandblasting operation
The surface temperature of the steel plate is above 3 degrees Celsius above the dew point. If conditions permit, the relative humidity in the workshop is less than 70%, and the relative humidity in the open-air operation is less than 80%.
- The abrasive
The abrasive used for sandblasting should conform to the GB6484, GB6485 standard of steel sand, steel shot or the use of salt-free and pollution-free quartz sand. There is a direct relationship between abrasive particle size and surface roughness.
- Sand blasting process requirements
The grade of sandblasting derusting should reach GB8923 Sa2.5. After sandblasting derusting, dry, clean and oil-free compressed air will be used to purge the inner surface of the pipe clean.
Water tank polyurea anticorrosion construction conditions
A. The environment and temperature shall meet the technical requirements of the product and design, and the environmental humidity shall be less than 70%;
B. The site is well ventilated to ensure that the fog can be discharged quickly;
C. Anti-corrosion construction should be carried out before the installation of accessories in the box body;
D. The rust removal grade of the metal substrate should reach SA2.5, the weld position should be cleaned, polished and smooth transition, and the treatment of the closed Water tank polyurea anticorrosion construction requirements.
Water tank polyurea anticorrosion construction requirements
A. Priming shall be carried out in time after qualified metal surface treatment. If not painted within 4h, surface treatment shall be carried out again;
B, The hole on the bottom material should be filled with sealing material when dense, with sealant filling should be smooth transition;
C, Primer spraying should be carried out by airless spraying method, spraying should be uniform;
D. The construction of the reinforcement layer shall meet the design requirements, and the adhesive edge of the reinforcement layer shall extend outward 50~60mm, and the thickness shall be 1mm;
E, Polyurea spraying construction can be completed within 12h; If more than 12h, should be in the lap of polyurea surface clean after brushing primer, and fully cured before recoating; After more than 48 hours, the surface of polyurea should be polished off at the lap joint and cleaned up, then the primer should be applied, and the coating can only be repainted after complete solidification.
F. After spraying polyurea coating, the next one should cover 50% of the last one, and the coating should be uniform.head position should meet the design requirements.
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