Contact: Cheng Huiqiang
Address：No. 333, Jinxian Road, Jinjiaba, FENHU Town, Wujiang District, Suzhou City, Jiangsu Province
According to survey statistics, in pipeline accidents in China, damage caused by corrosion accounts for about 30%. Corrosion of various types of pipelines in several oil fields in eastern China reached 20,000 times / year, and the number of pipelines replaced was 400 km / year. In the Sichuan natural gas pipeline, from May 1971 to May 1986, there were 83 explosion and combustion accidents caused by corrosion, and economic losses amounted to more than 600 million yuan. In 1993 alone, the economic losses due to corrosion in the production system of Zhongyuan Oilfield amounted to 1.6 billion yuan. China's petrochemical industry in 1989 caused about 2 billion yuan in economic losses due to corrosion.
一分彩1. Corrosion principle and influencing factors of oil and gas pipelines
一分彩Long oil and gas pipelines can range from hundreds of kilometers to thousands of kilometers. Crossing different types of soils Rivers and lakes due to the heterogeneity of the soil. Freezing and melting in winter and summer. Groundwater level changes, plant roots and stems penetrating the coating, microbial stray currents and other complex buried conditions cause complex corrosion rings to the pipeline. Organic sulfides, salts, formation water, mineral oxygen. Most of the corrosion encountered in China's oil and gas field production and urban gas pipeline networks is electrochemical corrosion. The principle of soil corrosion belongs to electrochemical corrosion. The main influencing factors of soil corrosion are soil resistivity, soil oxidation potential, salt content, water and air content, soil temperature, acidity, microorganisms, and stray current
2. Anti-corrosion technology for oil and gas pipelines
一分彩The anticorrosive forms of buried oil and gas pipelines usually include pipeline internal corrosion protection, pipeline external corrosion protection, pipeline cathodic protection, and underground pipeline corrosion protection. Requirements for anti-corrosion coatings on buried pipelines: good resistance to soil, water, mold and corrosion. Have good electrical insulation. When used in combination with cathodic protection, the anticorrosive coating should have a certain resistance to cathodic peeling strength. Have sufficient mechanical strength. To ensure that the coating is not damaged under handling and soil pressure. Anticorrosive coating technology for buried steel pipes includes petroleum asphalt anticorrosive coating, epoxy coal tar anticorrosive coating, coal tar enamel anticorrosive coating, polyethylene adhesive tape, sintered epoxy powder anticorrosive coating, and two layers of PE anticorrosive coating. , Three layers of PE anticorrosive coating, polyurethane rigid foam plastic anticorrosion and heat preservation composite structure. The latter three methods are commonly used methods.
Contact: Cheng Huiqiang
|Contact : Li Cong|
|Address: No. 333, Jinxian Road, Jinjiaba, Wujiang District, Suzhou, Jiangsu|