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Safety management and operation of pressure vessels

With the accelerated pace of China’s industrialization, pressure vessels are increasingly used in many production fields, and have become important production equipment in petroleum, chemical, metallurgy and other fields. The pressure vessel has strict operation standards when it is used, otherwise it will lead to explosion and other accidents, causing huge economic and social losses. Analyze the safety management and operation strategy of pressure vessels in the production field to guide the safe and efficient production of industry and avoid pressure vessel accidents caused by improper operation and use. 0. Introduction In recent years, with the expansion of industrial production […]

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Crack problems in inspection of pressure pipes of boiler pressure vessels

In order to ensure that the boiler pressure vessel can be maintained in a normal operating condition, the inspection of the boiler pressure pipe should be done well and handled as an important work content. And in the actual work of the boiler pressure vessel, due to the internal environment and the impact of the external environment, there will be cracking problems, and this cracking problem is easy to be ignored by the staff, however, this cracking phenomenon will have a serious impact on the normal operation of the boiler pressure vessel, which hides a great hidden danger of operation. […]

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General knowledge of pressure vessel classification and safety accessories

There are many ways to classify pressure vessels, from the point of view of use, manufacture and supervision and inspection, there are the following: Classification by design pressure ① low pressure (L) 0.1MPa ≤ P < 1.6MPa; ② medium pressure (M) 1.6MPa ≤ P < 10MPa; ③ high pressure (H) 10MPa ≤ P < 100MPa; ④ ultra-high pressure (U) P ≥ 100MPa. Classification by the role of the process Reaction pressure vessel (R) Mainly used to complete the physical and chemical reaction of the medium pressure vessel. Such as reactor, reactor kettle, decomposition pot, vulcanization tank, decomposition tower, polymerization tower, […]

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Welding Technology of Stainless Steel Pressure Vessels

The pressure vessel with stainless steel and its welding characteristics The so-called stainless steel is added to a certain amount of chromium in the steel, so that the steel in a passivated state, with no rust characteristics. In order to achieve this purpose, its chromium content must be more than 12%. In order to progress in the passivation of steel, stainless steel is often required to add nickel, molybdenum and other elements that can make steel passivation. The general reference to stainless steel is actually a general term for stainless steel and acid-resistant steel. Stainless steel is not necessarily acid-resistant, […]

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Key points of material selection for stress corrosion of pressure vessels

Stress corrosion cracking Stress corrosion cracking (SCC) of a metal material occurs only in a specific corrosion environment. The following table shows the combination of pressure vessel steel and corrosion environment that are easy to cause stress corrosion cracking. It can be seen that almost every material is likely to have stress corrosion cracking. Table.1 Combination of Pressure Vessel Steel/Corrosion Environment Easily Causing Stress Corrosion Cracking Metallic materials Corrosive medium Carbon steel and low alloy steel NaOH solution; KOH solution; Nitrate solution; HCN solution; HzS aqueous solution; CO+CO2+H2O system; Gas liquid or coke oven gas liquid (CH4+H2+CO2+HCN+H2S+NH3+H2O); Liquid ammonia; K2CO3; […]

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How to carry out protection and surface treatment in the manufacture of stainl……

This paper discusses the problems existing in the manufacture of stainless steel pressure vessels and how to do a good job in protection and surface treatment. It has been proved that by adopting relevant specific technical measures and scientifically applying the surface treatment technology of pressure vessels, the appearance quality of vessels can be guaranteed and various corrosion resistance of the surface can be enhanced. Stainless steel pressure vessel in the manufacture, the first should ensure that its wear resistance and corrosion resistance are relatively good, the surface of the stainless steel pressure vessel has a metallurgical organization, so in […]

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Measures to reduce stress concentration in the process of pressure vessel desi……

Pressure vessel is the key equipment in China’s petrochemical industry and industrial pharmaceutical industry. Because of its good storage function, it plays a positive role in promoting the production of pressure vessel. Therefore, safety, stability and other performance indicators are the key factors in the design and manufacturing process of pressure vessels, which have attracted extensive attention of designers and enterprises. Based on the characteristics of pressure vessels, the problem of stress concentration in the process of pressure vessel design and manufacturing is analyzed. Based on the existing process design technology, the process structure and design method are improved, and […]

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Pressure source of pressure vessel

Pressure vessel pressure sources can be divided into two categories, one is the pressure generated or increased outside the vessel; the other is the pressure generated or increased inside the vessel. The pressure source that generates or increases pressure outside the vessel is generally a gas compressor or a steam boiler. Compressors increase gas pressure by mechanical means. Volume compressor by reducing the volume of gas, increase the gas density to increase the pressure of the gas, such as piston or screw compressor that belongs to this category, speed compressor by increasing the flow rate of gas, and its kinetic […]

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Common pressure vessel design software

As the pressure vessel is more and more widely used in various industries, the role is becoming more and more prominent, in order to meet the requirements of the manufacture and use of pressure vessels, the requirements for the design are also increasingly high. As the design of pressure vessels, not only to master the relevant professional knowledge, according to the relevant standards and requirements for structural design and strength, stiffness and other aspects of the calculation, but also need to optimize the pressure vessel force, structural dimensions, materials, etc., to meet the rationality and economy of pressure vessel design. […]

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Chemical pressure vessel corrosion effective control strategy research

With the continuous improvement of China’s industrialization level, pressure vessels are widely used in chemical production. Pressure, temperature, media and humidity and other factors can lead to pressure vessels in the use of the process of more serious corrosion problems. Because of the corrosion of a variety of situations, this paper from the strengthening of the pressure vessel corrosion phenomenon to start research, and targeted to different corrosion situations to put forward the corresponding protective measures.   Pressure vessel is a closed container, can carry a certain pressure, can be loaded with gas or liquid. In the use cycle of […]

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