The petrochemical industry has very high requirements for surface corrosion protection of preparation and pipelines. Therefore, how to improve the quality of petrochemical equipment and pipeline anticorrosion and reduce the cost of anticorrosion in the whole life cycle is a problem worth exploring.
The factors affecting the quality of valve anticorrosion are mainly the following two links, one is the quality of the valve before leaving the factory , and the other is the storage environment and protection after delivery.
The anti-corrosion quality of the valve before leaving the factory is mainly related to the treatment of the valve surface, the selection of paint, the painting process, the packaging protection and other factors.

(1) The surface treatment of the valve

 it can be used to effectively improve the paint adhesion and reduce the anti-rust rate.

a. Organic solvent cleaning method: strict cleaning treatment is carried out before assembly of the valve and after hydraulic test. Ultrasonic cleaning technology can also be used. Valve ultrasonic cleaning steps are divided into cleaning (including local scrubbing) → rinsing (50℃~60℃ water + cleaning agent) → rinsing (50℃~60℃ water) → dry (dry air); Visually check the cleanliness of the valve appearance after cleaning, and paint it after the appearance meets the requirements.

b. Sandblasting shot blasting method: After the valve pressure test is qualified, the whole valve is sandblasting shot blasting treatment, and the valve stem, stud, nut and other positions are protected to prevent surface damage

(2) Paint selection
The selection of paint mainly considers the atmospheric environment, the operating temperature of the valve, the material of the valve, whether the heat preservation (cold protection), the design life and economic factors.
On-site storage and protection
Climate and environmental factors: Because most of the project sites are mainly concentrated in the southeast coastal area, the environmental humidity, temperature and salinity are high, coupled with dense rain, if the paint is not selected properly, it will accelerate the surface corrosion of the valve.

If your business involves valve procurement or requires professional valves, Welcome to consult us fluido, we are committed to meeting your various needs and provide customized services. We will deeply understand your needs through professional technical support and excellent product quality, and look forward to working with you!