久久99国产精品久久,免费看美女被靠到爽的视频,亚洲欧美综合区丁香五月小说,五十路熟妇亲子交尾,久久99精品九九九久久婷婷

Do you know seamless steel pipe suppliers

Seamless steel pipe suppliers is a spiral welded steel pipe welded by the automatic double line submerged arc welding process. The strip coil is used as the raw material, and the temperature extrusion forming and automatic double line double side submerged arc welding process are often used. The spiral submerged arc welding is mostly used for large-diameter welded pipes. It is mainly used for water, gas and oil steel pipes in the oil and gas industry. According to the national executive standard SY/T 5037-2018, the detection method is 100% hydrostatic test, ultrasonic detection and X ray detection. The characteristics of SSAW pipe are firstly to produce on a fixed scale according to the requirements of customers; secondly to ensure the specification, wall thickness and sufficient supply of goods; finally, it must be 100% qualified and the product quality is guaranteed. 3PE anti-corrosion spiral steel pipe: 3PE anti-corrosion spiral steel pipe is a deep-processing spiral welded pipe, which refers to the three-layer polyolefin external anti-corrosion steel pipe commonly used in China. Its application: 3PE anti-corrosion spiral steel pipe is widely used in petroleum, chemical industry, natural gas, heat treatment, sewage treatment, water source, bridge, steel structure, marine water delivery pile and other pipeline engineering fields. Process flow: 3PE anticorrosive steel pipe base material includes seamless steel pipe, spiral steel pipe and straight seam steel pipe. Before anti-corrosion treatment, the steel pipe entering the air intake platform shall be inspected and recorded, and the outer surface of the steel pipe shall be shot blasted and rusted, and then the cleanliness of the outer surface of the steel pipe and the depth of anchoring particles shall be checked to see whether they meet the requirements. The unqualified products shall be grinded and repaired by hand grinding wheel, wrapped with tape at the pipe end, treated with dust, heated to the specified temperature in the medium frequency, sprayed with epoxy powder, wrapped at the side of the adhesive extruder, wrapped and burned at the side of the PE extruder, water-cooled anti-corrosion pipes, painted marks of qualified products, and stacked on the lower pipe platform. Product advantage: ordinary steel pipe will corrode in bad environment, which will reduce the service life of steel pipe, while the service life of anti-corrosion and heat preservation steel pipe is relatively long, which can be used for about 30-50 years. 3PE anti-corrosion and heat preservation steel pipe has good heat preservation performance, the heat loss is only 25% of the traditional pipe, long-term operation can still save a lot of resources, significantly reduce energy costs, also has good corrosion resistance and impact resistance under low temperature conditions, and can be directly buried in frozen soil in a certain environment.