Introduction of three treatment methods for pipeline anticorrosion

Pipeline is the most commonly used equipment in our life, and its function is mainly used to transport liquids or other solids. Pipeline anticorrosion is the most common in pipelines. The main purpose of pipeline anticorrosion is to slow down or prevent the pipeline from corrosion or deterioration under the chemical properties, electrochemical action or microbial metabolism of the medium. In addition, pipeline anticorrosion can also prevent environmental pollution. Then Bian Xiao will tell you something about pipeline anticorrosion, hoping to help you.

Pipeline anticorrosion method

Anticorrosive coating for inner wall

In order to ensure the firm combination of the coating and the pipe wall, the inner wall of the pipe must be surface treated. Since 1970s, there has been a tendency to use the same material to coat the inner and outer walls of pipelines, so that the coating of the inner and outer walls of pipelines can be carried out at the same time. The above is the anti-corrosion method of anti-corrosion pipeline, and another anti-corrosion method will be explained to you later. I hope these can help you to know more about the world of anti-corrosion materials.

Exterior wall anticorrosive coating

It is one of the most basic methods of pipeline corrosion protection to apply paint evenly and densely on the surface of derusted metal pipeline to isolate it from various corrosive media. Since 1970s, laying pipelines in harsh environments such as polar regions and oceans, and heating and transporting oil products have put forward more requirements for coating performance. Therefore, composite materials or composite structures are increasingly used for pipeline anticorrosion coatings. These materials and structures should have good dielectric properties, physical properties, stable chemical properties and wide temperature adaptation range.

Pipeline surface treatment

Before anticorrosion treatment, the surface of pipeline substrate should be treated to remove water, oil, dirt, pollutants, rust and scale. There are many methods of surface treatment. Generally, manual derusting, sand blasting or chemical derusting are commonly used. When manually derusting, the quality standard should reach St3 level; When sandblasting or chemical derusting, the quality standard should reach Sa2.5 level, and the surface roughness should be 30 ~ 50? M is more suitable. The treated surface shall be primed within 4 hours.

External anticorrosion design of pipeline

Petroleum asphalt anticorrosive coating is the oldest anticorrosive coating, which is used well in most dry areas. With the development of technology, epoxy coal tar pitch and zinc-rich coating have replaced petroleum pitch as anticorrosion coatings for steel water pipelines. Epoxy coal tar pitch series coatings have always been the first choice for anticorrosion coatings of steel water pipelines because of their excellent anticorrosion performance and low price.

The temperature of the conveying medium of epoxy coal tar pitch anticorrosive coating is generally not higher than 1 10℃. In order to meet the requirements of different corrosive environments, it is divided into three levels: ordinary level, enhanced level and extra enhanced level. The ordinary structure is one primer and three topcoats, and the dry film thickness is ≥ 0.3 mm; The strengthening grade structure is primer → topcoat → topcoat, glass cloth, topcoat → topcoat, and the dry film thickness is ≥ 0.4 mm; The structure of special strengthening grade is primer → topcoat → topcoat, glass cloth, topcoat → topcoat, glass cloth, topcoat → topcoat, with dry film thickness ≥0.6mm, and topcoat, glass cloth and topcoat shall be applied continuously. In practical engineering, the grade should be selected according to the engineering conditions and conveying medium.

During the construction of anticorrosive coating, the ambient temperature should be higher than 5℃ and the air humidity should be lower than 80%. 5% diluent, 20 ~ 25mm glass cloth blank holder and 100 ~ 150mm lap length. Voltage inspection of coating: general level: 2000V reinforcement stage: 2500V special reinforcement grade: 3000 V. Coating inspection: every 10km, with leakage point ≯5, measure with low-voltage audio signal leak detector.

The main function of pipeline anticorrosion is to prevent pipeline from being corroded by soil, air and medium. At present, pipelines are mostly used to transport gasoline, natural gas and other substances that have a great corrosive effect on the environment and soil. Pipelines can effectively prevent the environment from being polluted by these substances and greatly improve the transportation efficiency. Pipeline corrosion protection can also prevent the leakage of natural gas and oil. It has a good protection and prevention effect on fire and environment. It is conceivable that the importance of pipeline anticorrosion is so specific.

Tubatu Online provides you with "every decoration quotation, 1-4 local decoration companies, 3 sets of decoration design schemes" and the decoration pit avoidance strategy for free! Click this link:/Zhu Ye /zxbj-cszy.php? to8to _ from = SEO _ zhidao _ m _ jiare & amp； Wb, you can get it for free ~