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Case sharing: leakage failure analysis of 316L stainless steel pipe

316L belongs to austenitic stainless steel, corresponding to domestic brand 022cr17ni12mo2, which has good plasticity and corrosion resistance. The addition of Mo element in the stainless steel greatly improves its pitting resistance. Therefore, 316L stainless steel is widely used in petrochemical, pharmaceutical and other industries. The 316L stainless steel pipe used in an enterprise was found to have leakage and perforation on its wall. The working medium in the pipe is water vapor, the working pressure is 0.9mpa, the medium outside the pipe is strong alkali and copper powder, the working pressure is 1.0MPa, and there is pressure difference between […]

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Piping arrangement in petrochemical plant

In petrochemical plant, pipelines with different operation parameters and transmission medium properties are quite different, and their importance and risk are also different. In order to better ensure the reliability and safety of pipelines in the operation process, different design, manufacturing and construction requirements are proposed for pipelines with different importance. Determination of pipeline design conditions Design pressure The design pressure of petrochemical pipeline and its components shall not be lower than the pressure under the most severe conditions combined by internal pressure and temperature during operation. 1. The design pressure of all pipelines connected with equipment or pressure vessel […]

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How to evaluate and eliminate water hammer in liquid collection system?

What is water hammer? In the pressure pipeline, because of some external reasons (such as sudden closing of valve, sudden stopping of pump unit), the flow velocity of water changes suddenly, resulting in water hammer. This kind of hydraulic phenomenon is called water hammer or water hammer. Water hammer is called water hammer because of the inertia of the pressure water flow when the power is cut off suddenly or the valve is closed too fast, which produces the water shock wave, just like the hammering. Sometimes, the force produced by the back and forth of the water flow shock […]

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Austenitic Stainless Steel: 904L (UNS N08904)

Characteristics of 904L UNS N08904, commonly known as 904L with its DIN equivalent W.Nr. 1.4539, is a low carbon super austenitic stainless steel. It has superior corrosion resistance to that of conventional Cr-Ni stainless steels such as SS316L and SS317L resulting from the deliberate addition of copper content. Although the 904L stainless steel has limited use with hydrochloric acids, it has high resistance to pitting corrosion in chloride solutions, high resistance to both crevice and stress-corrosion cracking. The grade is non-magnetic and has excellent formability and weldability, as well as good toughness in cryogenic temperatures. 904L stainless steels have greater […]

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Comparison of hydrostatic test and eddy current test for steel tube

The water pressure test and eddy current test of boiler tubes are the dense performance test of materials, and they are equivalent in the test method; and the eddy current test of steel tube has the characteristics of fast, accurate and easy to realize automatic detection, etc., which is superior to the water pressure test method which is time-consuming, labor-consuming and less accurate in the test method. Therefore, the eddy current test method can be used completely It can not replace the densification test of eddy current flaw detection. It is of great significance to control the material quality of […]

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What is the corrosion of metal materials for industrial chemical pipeline?

The harm of metal corrosion is very common and serious. Corrosion will cause great direct or indirect losses, catastrophic accidents and personal safety. The running, emitting, dripping and leaking of production equipment and industrial chemical pipelines caused by corrosion will affect the production cycle and equipment life of production equipment, increase production cost, and also pollute the environment and endanger human health due to the leakage of toxic substances. Classification according to the mechanism of corrosion According to the mechanism of corrosion, it can be divided into chemical corrosion, electrochemical corrosion and physical corrosion. Chemical corrosion Chemical corrosion refers to […]

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Failure analysis and preventive measures of induction bend

Induction Bend is an important component of oil and gas transmission pipeline. Due to the particularity of bend manufacturing process and structure, the working condition of bend is worse than that of straight pipe in the transportation process, which is the weak link of the transportation pipeline, and the failure accident often occurs. In view of the above problems, the author makes a comprehensive analysis and research on the manufacturing process, quality influencing factors, quality control, failure reasons, etc. through the specific failure case analysis, it demonstrates the impact of solid particle erosion, material structure defects and mechanical damage on […]

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Nickel Alloy: Nickel 200 (UNS N02200)/Nickel 201 (UNS N02201)

What is Nickel 200 (UNS N02200)? Designated as UNS N02200 & W.Nr. 2.4060 & 2.4066, Nickel 200 is solid solution strengthened and commercially pure wrought nickel. It has good mechanical properties and excellent resistance to many corrosive environments. Nickel 200 is primarily used in food processing industry due to its corrosion resistance. It can also be used in applications involving reducing chemicals, caustic alkalies, distilled and natural waters, alkaline salt solutions, dry fluorine, and synthetic fibers. Depending on the specific product form, Nickel 200 may be furnished with different heat treatment and delivery conditions which result in different mechanical properties (tensile […]

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Development of high performance nickel base corrosion resistant alloy

Nickel base alloy is not only widely used as high temperature alloy in many industries, but also as corrosion-resistant alloy in aerospace, nuclear engineering, energy and power, transportation, oil and gas development, petrochemical industry, marine engineering and metallurgical industry and other fields. Therefore, the development and application of nickel base alloy are highly valued in various countries. With the increasingly complex and harsh service environment, especially the continuous improvement of engineering design standards, the requirements for material corrosion and protection engineering are also higher and higher, so high-performance nickel base corrosion-resistant alloy has been the focus of research and development […]

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Selection and Application Guide: corrosion resistant nickel alloy

Nickel alloy has excellent corrosion resistance, strength, toughness, metallurgical stability, processability and weldability. Many nickel alloys also have excellent heat resistance and are ideal for applications requiring high temperature strength and chemical resistance at high temperatures. The forging and rolling nickel base alloy (defined as the alloy containing more than 45% nickel) introduced here includes various forging and rolling corrosion-resistant alloys commonly used in chemical plants. The chemical composition and UNS number of these alloys are listed in Table 1. For the convenience of readers, some commonly used trade names are listed beside. Table.1 nominal chemical composition of corrosion resistant […]

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