steel pipe

    Material analysis of 3PE anti-corrosive steel pipe     3PE anticorrosive steel pipe base material includes seamless steel pipe, spiral steel pipe and straight seam steel pipe. The three-layer structure polyethylene (3PE) anticorrosive coating has been widely used in the petroleum pipeline industry due to its good corrosion resistance, water vapor permeability resistance, and mechanical properties.     Introduction to the anti-corrosion layer of 3PE anti-corrosion steel pipe     3PE anti-corrosion steel pipe-an anti-corrosion layer is crucial to the life of buried pipelines. Some pipes of the same material are buried in the ground for decades without corrosion, and some leak in several years. It is because they use different outer coatings.     3PE anti-corrosion generally consists of 3 layers of structure:     First layer of epoxy powder (FBE> 100um)     Second layer of adhesive (AD) 170 ～ 250um ...

    Square rectangular tubes are popularized and applied with high-pressure air-cooling quenching technology. Foreign heat treatment manufacturers pay more attention to the cooling during heat treatment of rectangular tubes. According to the technical requirements of structural alloy steel pipes , we can perform slow cooling, oil quenching and one-time gas quenching. The rapid atmosphere circulation cooling uses a high-pressure gas spray to the cooling chamber. The computer controls the changes in flow rate and flow rate to achieve the normal cooling rate in a specific time, so as to achieve the cooling curve required during the heat treatment process of the rectangular tube. Actual quality of heat treatment of structural alloy steel pipes. The quenching gas previously cooled by the rectangular tube gas quenching method is nitrogen and helium. When the jet is strongly realized with air, the structural alloy steel pipe is cooled at a very rapid rate, and the surface after quenc...

    Oil casing pipe in-plant inspection: defect handling     Various defects found in the pipe body or pipe end that affect the performance of the pipe, such as pits, cracks, folds, bumps, bumps, gouges, delaminations, hairlines, etc., if the depth of the defects does not exceed the entire pipe 10% of the wall thickness can be removed by manual grinding, and the smooth transition between the ground and the pipe can be achieved.     During the inspection, if the depth of the pipe body defect is found to exceed 10% of the wall thickness of the whole pipe body, the root pipe shall be judged as unqualified; if such an over-standard defect is found at the pipe end, it shall be marked and mechanically removed.

    1. Gage length measurement     The basic principle is: two fixed-length grating rulers are set on the outer sides of the two ends of the seamless steel tube, and the rod ruler is used to drive the grating ruler near the two ends of the steel pipe.     It is characterized by high accuracy. However, encoders are expensive and difficult to maintain, and are sensitive to the effects of dust and site vibration.     2. The camera measures the length     Camera length measurement uses image processing to measure the length of straight seam steel pipes. The principle is to install a series of photoelectric switches at an equal distance on a certain section of steel pipe conveyor rollers, and add a light source and a camera to the other section. When the steel pipe passes through this area, the length of the steel pipe can be determined according to the position of the image on the screen captured by the camera with a photoelectric sw...

    The J55 casing pipe coupling phosphating process adopted by the J55 petroleum casing coupling supplier is chemical degreasing, acidic rust removal, chemical degreasing (secondary) water washing, acid etching, water cleaning, phosphating, deionization Washed, air-dried, inspected, dipped in dehydrated antirust oil. After the phosphating process, the J55 petroleum casing coupling has a significantly improved corrosion resistance, so this process is widely used. In the process of oil and gas drilling and production, a large number of casing and tubing are used, and a J55 petroleum casing coupling is used between each two tubing. Corrosion is also one of the main reasons for tubing Luo Jing. Due to the above reasons, many J55 petroleum casing coupling suppliers are constantly discussing the mechanism of their corrosion, and strive to study the corrosion protection measures, so as to ensure that the safety of production is as large as possible. For J55 petroleum casing couplin...

    After the production of stainless steel welded wire mesh is completed, the hot-dip galvanizing process is usually used to improve the corrosion resistance. However, there are many factors in this process leading to a significant increase in zinc consumption, which needs to be improved.     1. The quality of pickling is unstable. The concentration of pickling solution is not well controlled. Too strong or too thin will affect the quality of pickling. If the welding wire passes through the pickling tank at an uneven speed, the floating matter in the pickling solution can easily stick to the surface of the welding wire, causing the pickling quality to be unstable.     2. Welded wire mesh enters galvanizing solution without drying. This phenomenon will cause the temperature difference between the screen and the galvanizing solution to be too large, the amount of zinc layer adhesion will increase greatly, and even zinc thorns and other phenomena will app...

    1. Confirm the leaking section by closing the valve and observe the ground to confirm the leaking point.     Confirm that the valve can be closed completely. According to our experience, more than 70% of domestic valves, especially those installed after 1,2 years, are difficult to close. If the valve can be closed, you can confirm the approximate area of water leakage, and take a closer look. The state of the ground above the pipes in this area is not sinking, especially wet, and whether there is stable clear water in the sewer next to it.     This leak detection method is suitable for the general public, and the technical content is not high, but it is difficult to accurately locate the leak point, the excavation area is large, and it is easy to cause misexcavation.     2.Listen to the sound     At 2 in the morning, when the night is quiet, when the surroundings are very quiet, follow the pipe slowly. If there is a large amo...

    The refined oil pipelines in petroleum pipelines are mainly used to transport refined petroleum products to petroleum sales companies, or pipelines that transport semi-refined petroleum products to refining and chemical enterprises. The solidification point of the refined oil is relatively low, and no heat treatment is required.At the same time, the type of oil to be delivered is large, the batch is large, and the number of oil separation points is often in the form of sequential delivery. Oil storage or distribution oil storage in Xiaoling area.     The pipeline process of product oil pipeline transportation is: oil terminal, oil depot, long-distance oil product pipeline, refinery, oil depot, long-distance oil product pipeline, petroleum sales company.     For the transportation of natural gas pipelines in oil pipelines, because of the high shipping cost of natural gas compression tanks, direct pipeline transportation is usually adopted after the g...

    Continuous hot dip galvanizing process has Sendzimir, modified Sendzimir US Steel Union law three kinds. Sendzimir method and improved Sendzimir process is simple, low cost of the product, but due to direct flame heating, although steel rolling oil can burn the surface, but the impact of the strip surface quality, is not conducive to the production of thin gauge products. US Steel Union law set before annealing cleaning section, electrolytic degreasing, the strip surface oil can be completely removed. In addition, the process uses the full reduction furnace radiant tube heating strip, therefore better surface quality galvanized layer. Although the process is relatively complex, low thermal efficiency, but it can produce better surface quality, thinner hot galvanized steel, and can reduce the H2 content in the furnace, improve security, and therefore the new hot dip galvanizing line is mostly US steel Union law.     Modern cold-rolled steel strip continuous hot-...

    1.Grinding wheel cutting: This is the more commonly used method at present, that is, cutting with a grinder, but there will be more burrs on the pipe port after cutting out. If a fully automatic stainless steel pipe end C burr removal machine can be used in conjunction with the cost cheaper.     2.Wire cutting: It is the use of wire cutting and fast-moving wire, so that the cutting can meet the requirements of the quality of the incision, but it should be noted that the color of the pipe end will change after cutting, and the grinding and polishing treatment method is required to achieve the desired effect.     3.Metal circular saw cutting: this cut is better, and can achieve several simultaneous cutting, but the chips easily stick to the props, so you need to be careful when buying saw blades.     4.Rolling blade chipless pipe cutting machine: smooth cut without sawtooth,suitable for small and medium-sized enterprises. The disadvantage ...