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Corrosion of stainless steel pipeline in offshore environment

In an island power transmission project: 321 stainless steel seamless pipe is used for water system transmission. The surface treatment method of outdoor pipeline is sand blasting. After being put into use for 10 months, it was found that the surface of the outdoor pipeline was seriously rusted and there were more rusts. It is found that the rust on the surface of the pipeline is floating rust, which can be removed by wiping with a drawcloth. In order to find out the cause of corrosion of outdoor stainless steel pipeline in a short time and solve the problem of […]

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Classification and application of bellows expansion joint in high temperature ……

Why use bellows expansion joints in high temperature pipelines? When there is a temperature change in the pipeline transportation medium or the environment where the pipeline is located, the thermal expansion and contraction caused by the temperature of the pipeline are inevitable. If the size change is not compensated in a certain way, a high stress will be generated in the pipe wall, which will be transmitted to the fixed pipe rack or equipment through the pipeline. When the temperature difference is over a certain range, the temperature difference stress is greater than the stress range that the pipe can […]

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Research and development of X80 steel induction heating pipe bend used in Chin……

About China–Russia East-Route Natural Gas Pipeline: The China–Russia East-Route Natural Gas Pipeline was officially put into operation on December 2, 2019. The Pipeline includes the section Russia, often referred to as Power of Siberia gas pipeline, the cross-border section and the section in China. The gas is mainly supplied from the Kovyktinskoye Gas field in Irkutsk Oblast and the Chayandinskoye Gas field in Sakha Republic (Yakutia) in East Siberia, Russia. The Chinese section of China–Russia East-Route Natural Gas Pipeline with the largest diameter and the highest pressure currently in the country, starts from Heihe city, Heilongjiang Province in the north winding […]

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Practical knowledge of expansion joints

Why use expansion joints? According to the physical characteristics of metals, most metals expand when the temperature increases and contract when the temperature decreases. In the pipeline system, this kind of physical phenomenon will lead to the change of the length of each part of the pipeline. However, the pipe is usually fixed on at least two joints. Any length change will cause thermal stress on the material and increase the force and moment on these joints. Therefore, it is necessary to make full use of the inherent flexibility of the pipeline to compensate for the expansion of the pipeline […]

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What is duplex stainless steel pipe?

What is duplex stainless steel pipe? Compared with ferritic stainless steel and austenitic stainless steel, duplex stainless steel pipe has good welding performance. It is neither like the welding heat affected zone of ferritic stainless steel, because of the grain coarsening, the plastic toughness is greatly reduced, nor like austenitic stainless steel, it is more sensitive to welding hot cracks. Due to its special advantages, duplex stainless steel is widely used in petrochemical equipment, seawater and wastewater treatment equipment, oil and gas pipelines, paper-making machinery and other industrial fields. In recent years, it has also been used in the field […]

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Special welding process and NDT requirements for duplex stainless steel

Duplex stainless steel is a kind of stainless steel with dual phase microstructure of ferrite and austenite. The proportion of ferrite and austenite in solution structure is about 50%, and the content of less phase is more than 30%. The metallographic structure determines that the performance of the Ferritic Austenitic duplex stainless steel is between ferritic stainless steel and austenitic stainless steel. It has the advantages of both stainless steels. It not only has good plasticity, toughness, corrosion resistance and weldability, but also has stronger intergranular corrosion resistance than other kinds of stainless steel. Duplex stainless steel has good resistance to […]

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How to choose the right gasket?

In the production, processing, storage, transportation and even sales of petroleum, petrochemical, chemical and other industries, there are often risk factors such as flammability, explosion, high temperature, high pressure, toxic and harmful, corrosion and so on. The “running, emitting, dripping and leaking” of working medium of machines and equipment in use bring great harm to production. Leakage of working medium in equipment will cause waste and environmental pollution. Gasket seal is the most important type of static seal for pressure vessel, process equipment, power machine and connecting pipe in process industry. They contain a wide range of fluid media, and […]

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What is a washer?

What is a washer? Washer is a part which is usually used to pad between the connecting piece and the nut. Its purpose is to protect the surface of the connected piece from being scratched by the nut, to disperse the pressure of the nut on the connected piece, and to reduce the separation caused by vibration. Washers are usually metal or plastic, usually flat metal rings. Since the torque is applied after indentation to prevent the loss of preload, hardened steel washers are required in special cases. Especially by insulating steel screws from aluminum surfaces. Taps (or taps, or […]

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What is a pressure relief valve?

What is a pressure relief valve? The pressure reducing valve is a valve that can reduce the inlet pressure to a certain required outlet pressure through regulation and make the outlet pressure automatically maintain stable by relying on the energy of the medium itself. From the point of view of hydrodynamics, the pressure reducing valve is a throttling element whose local resistance can be changed. That is to say, by changing the throttling area, the velocity and kinetic energy of the fluid can be changed, resulting in different pressure losses, so as to achieve the purpose of pressure reduction. Then, […]

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Study on the characteristics of high temperature steam oxidation layer of T91 ……

In order to realize the energy saving and consumption reduction of thermal power units, the unit parameters continue to improve [1,2,3], the superheater and reheater should operate in the water steam environment with higher temperature and pressure, and the subsequent oxidation problems become more and more prominent [4,5,6,7,8]. In recent years, the economic and safety accidents caused by the rapid growth of oxide layer and a large number of peeling have become more and more serious [9, 10, 11]. Its harm involves the following four aspects: (1) The formation of oxide layer causes the decrease of effective wall thickness of […]

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