Quality supervision and inspection of anti-corrosi

2022-08-14
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The special material performance inspection of the quality supervision and inspection center of anti-corrosion and thermal insulation products of CNPC has been successfully put into use in many anti-corrosion (3PE) pipeline production enterprises in domestic three-layer polyethylene steel plants that produce different types of varieties. The anti-corrosion performance indicators of the oil and gas transmission pipelines have met the requirements of the national standard, filling a gap in Chinese petroleum products. The polyethylene anticorrosion special material developed by Dushanzi Petrochemical takes the chromium series polyethylene products of the enterprise as the basic material. Through adjusting and optimizing the catalyst, comonomer and process temperature involved in the polymerization process, the melt flow rate, molecular weight and molecular weight distribution of the basic resin at the government level are controlled, the mechanical properties and processability of the product are improved, and the unique antioxidant system is added for processing and production, The products have outstanding mechanical properties, light and heat aging resistance and environmental stress cracking resistance, and their comprehensive properties have reached a high level of similar materials in the domestic market, and have passed the performance inspection of special materials by the quality supervision and inspection center of anti-corrosion and thermal insulation products of CNPC. The product has been processed and applied in many domestic anti-corrosion products enterprises. Through product testing, targeted performance adjustment and process optimization, the production of polyethylene anti-corrosion special material is finally an industrial form of production factors dynamically configured according to information resources, with stable processing performance, excellent mechanical properties of finished products and smooth and shiny appearance

through continuous modification, the polyethylene anti-corrosion special material developed and produced by Dushanzi Petrochemical was first applied to the production of domestic oil and gas transmission pipelines as polyethylene anti-corrosion special material for coated pipes in February 2008. At present, oil and gas transmission pipelines with diameters of 219, 273, 426 and other pipe diameters have been successfully produced. The performance indicators of raw materials and finished products have met the requirements of national standards. Traditional oil and gas pipelines use external anti-corrosion materials, mostly asphalt anti-corrosion materials such as petroleum asphalt, coal tar enamel, epoxy coal asphalt, etc., which have the problems of poor construction environmental conditions, high labor intensity, and difficult to guarantee the anti-corrosion quality. While the three-layer structure polyethylene anti-corrosion technology (3PE) integrates the performance advantages of fusion bonded epoxy powder and extruded polyolefin coating, and has good mechanical performance, high insulation performance With excellent comprehensive performance, it can be applied to the corrosion prevention of steel pipes in various complex geographical environments. At present, the common external anti-corrosion coatings of underground pipelines at home and abroad can be divided into six categories, namely: petroleum asphalt coating, polyethylene tape anti-corrosion coating, extruded polyethylene anti-corrosion coating, fusion bonded epoxy powder coating, coal tar enamel, epoxy coal tar anti-corrosion coating. The three-layer PE anti deployment intelligent loading robot project R & D corrosion layer is a fusion bonded epoxy powder primer and a composite anti-corrosion layer wrapped with extruded polyethylene. The above six types of anti-corrosion coatings are used in different scales in China, and there are corresponding technical standards or specifications

Dushanzi Petrochemical Company, as a regional company of China National Petroleum Corporation, is a large integrated refining and chemical enterprise. At present, there are 12 grass-roots units, including a 6million ton/year refinery, a 220000 ton/year ethylene plant, a thermal power plant with an installed capacity of 150000 kW and a steam supply of 1400 ton/h. The total number of employees is 6438 (53% of junior college students or above), the total assets are 10.1 billion yuan, and the debt ratio is 25%. The company has fully passed the QHSE (quality, health, safety and environment) standard certification. It can produce more than 240 kinds of refined products in 7 categories, such as fuel oil, base oil, solvent oil and triphenyl, as well as more than 100 brands of chemical products in 14 series, such as polyethylene, polypropylene, ethylene glycol and rubber. During the Tenth Five Year Plan period, a total of 19.73 million tons of crude oil were processed and 1.08 million tons of ethylene were produced. The sales revenue was 51.8 billion yuan, the assessment profit was 3.9 billion yuan, and the tax paid was 4.3 billion yuan. It ranks second among the 30 key enterprises in Xinjiang and is one of the top 100 enterprises in China

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