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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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Process comparison of annealing and pickling line for cold rolled stainless st……

After the cold rolling treatment, the hardness and strength of stainless steel sheet are significantly improved, forming performance is insufficient, and it is difficult to be put into the market, so a series of follow-up treatment should be carried out. Among them, the cold-rolled stainless steel annealing and pickling line is to carry out processing annealing for cold-rolled sheet, remove the strip stress, remove the oxide scale formed during processing annealing, and finally carry out finishing and straightening treatment to improve the surface quality of the strip and obtain satisfactory products. Therefore, it is of great practical significance to study […]

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The present situation of gas valve in China and the selection of common gas va……

With the strengthening of China’s environmental awareness and the change of energy structure, China’s urban gas industry has made great progress. The types of gas have developed from simple coal system to multiple gas sources. In the late 1990s, the continuous development, construction and utilization of China’s natural gas resources have promoted the development of China’s urban natural gas into a new era. Contents: Current situation of gas valves in China Requirements for valves installed on underground pipe network Selection of valve body material of gas valve Brief introduction of several gas valves currently used in China’s gas industry Introduction […]

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How to choose the right valve according to the medium flow meter?

How to choose the right valve according to the medium flow meter? As we all know, the flow and velocity of valve depend mainly on the diameter of valve, and also on the resistance of the structure to the medium, and at the same time, it has certain internal relations with the pressure, temperature and concentration of the medium. Contents: Valve nominal diameter to inch Valve diameter (DN) and pipe diameter kilograms and pounds in valves Valve pressure rating Pressure bearing directions and installation directions of valves Selection principles of valves The flow area of valve is directly related to […]

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