Year1
- 规格：
- 219-3500mm
- 规格：
- 6-28
- 型号：
- sy/t5037-2012
_ According to survey statistics, the damage caused by corrosion accounts for about % of pipeline accidents in my country. Various pipelines in several oil fields in eastern my country are perforated tens of thousands of times due to corrosion
Kilometers of pipelines are replaced per year. In Sichuan natural gas pipelines, explosions and combustion accidents caused by corrosion caused economic losses of more than 100 million yuan. The economic losses caused by corrosion in the Zhongyuan Oilfield production system alone amount to 100 million yuan each year. The annual economic loss caused by corrosion in my country's petrochemical industry is approximately 100 million yuan. ,
Principles and influencing factors of corrosion of oil and gas steel pipes Long oil and gas transmission steel pipes can range from hundreds to thousands of kilometers long. Rivers and lakes pass through different types of soil due to the heterogeneity of the soil. Freezing and thawing in winter and summer. Complex buried conditions such as changes in groundwater levels and stray currents from microorganisms penetrating the coating from plant roots cause complex corrosion rings of organic sulfides, salts, formation water, and mineral oxygen to the pipeline. Most of the corrosion encountered in my country'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, stray current,
Oil and gas steel pipe anti-corrosion technology buried oil transportation, The anti-corrosion forms of gas transmission steel pipes usually include internal pipeline anti-corrosion, external pipeline anti-corrosion, pipeline cathodic protection, and above-ground pipeline anti-corrosion. Requirements for the external anti-corrosion coating of buried pipelines: good corrosion resistance and construction performance against soil, water and mold. Has good electrical insulation. When used in conjunction with cathodic protection, the anticorrosive coating should have a certain ability to withstand cathodic peeling strength. Has sufficient mechanical strength. To ensure that the coating is not damaged by handling and soil pressure. The external anti-corrosion coating technology for buried steel pipes includes petroleum asphalt anti-corrosion layer, epoxy coal tar anti-corrosion coating, coal tar enamel anti-corrosion coating, polyethylene adhesive tape, fused epoxy powder anti-corrosion coating, two-layer anti-corrosion coating and three layers Anti-corrosion coating, polyurethane rigid foam anti-corrosion insulation composite structure. The latter three methods are commonly used.
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