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Pressure Vessel With High Pressure And High Temperature Resistance
Jul 18, 2017

The pressure vessel is the airtight equipment which is used in the production process of the reaction, heat exchange, separation, storage and so on in the industrial production, which is equipped with gas or liquid, and has certain function. Pressure vessel Manufacturing is an important branch of petrochemical general machinery manufacturing industry and an important part of equipment manufacturing industry.

Pressure vessels are basically working under the pressure state, Pressure Vessel and Pressure Pipe Component and the processing medium is high temperature or flammable explosive, the danger is extremely high, so all countries of the world will pressure vessels as special equipment to be mandatory management. The types and functions of pressure vessels vary with the application, and the whole design, manufacturing and use process involves metallurgy, structural design, machining, welding, heat treatment, nondestructive testing, Pressure Vessel and Pressure Pipe Component automation and other professional and technical categories. Therefore, the technical development of the pressure vessel is based on the comprehensive development of the professional technology.

Development direction of pressure vessel body

Along with the international economy, the technology trade exchange strengthens and the pressure vessel design, the manufacture and the use management maturely, the domestic and foreign pressure vessel's development gradually presents the following several directions:

The generalization and standardization of pressure vessels has become one of the irreversible trends. This is because generalization and standardization also mean interchangeability, Pressure Vessel and Pressure Pipe Component which is not only beneficial to the day-to-day maintenance and logistical support of pressure vessel units, but also minimizes design and manufacturing costs. At the same time, for exporting countries like ours, standardization also means getting a pass to international. Pressure Vessel and Pressure Pipe Component From the practice analysis of the pressure vessel exporting countries around the world, we can see that the international engineering company can promote the development of the pressure vessel industry and the international recognition of the standard, Pressure Vessel and Pressure Pipe Component thus obtain the bigger world voice and the rich economic profit.

Specialization and professionalization

Although there are many advantages of generalization and standardization, such pressure vessels can only be used in some ordinary occasions, and the pressure vessels with special functions must be used in the working environment with special requirements. such as nuclear reactor containers, crystal processing containers and rocket fuel tanks, and so on, pressure vessels must have a very strong corrosion resistance, Pressure Vessel and Pressure Pipe Component high pressure and high temperature resistance. It is these special needs that push the pressure vessel toward specialization and specialization in the direction of continuous development and progress.

(1) Ultra-high pressure vessel: it refers to the work pressure is greater than or equal to 100MP containers, such containers in the polymerization of ethylene, artificial crystal manufacturing and so has been widely used. But it still has problems of high manufacturing costs and inadequate safety. Now, Pressure Vessel and Pressure Pipe Component with the advent of new materials and the development of metallurgical industry, the pressure resistance and strength limit of ultrahigh pressure vessels are also increasing gradually, which will promote the development of ultra-high pressure vessels.

(2) High temperature pressure vessel: the so-called high-temperature, usually refers to the wall temperature over the container material creep starting temperature (for the general steel about 350 ℃). Thermal Power station Boiler Drum ﹑ Coal conversion reactor, some reactor type (High-temperature gas cooled reactor and breeder reactor) nuclear power plant reactor pressure vessel, etc., are high-temperature pressure vessels. The creep of the high temperature pressure vessel will produce a slow change in shape and size. Under the long-term effect of high temperature, the tensile strength of the material is much lower when the durability is short. Therefore, Pressure Vessel and Pressure Pipe Component the main basis for the selection of materials is high temperature durability and corrosion resistance. The stress analysis of high temperature pressure vessel is very complicated, and it is difficult to solve the problem. Modern practice shows that it is feasible to use finite element method to analyze. If the container is subjected to alternating loads (e.g., repeated step-up and step-down), fatigue (see fatigue strength design) and creep interaction should also be considered.

(3) Strong corrosion pressure vessel: Because pressure vessel often with acid, alkali, salt and other strong corrosive medium contact, corrosion not only cause material consumption, and will cause equipment damage, raw materials and product loss, pollution environment, and even cause poisoning, fire and explosion and other vicious accidents. such as transport sulfuric acid, hydrochloric acid tanks, not only to have strong corrosion resistance, Pressure Vessel and Pressure Pipe Component and the safety requirements are very strict, this is not the general pressure vessel can be satisfied.

(4) Cryogenic pressure vessel: It is mainly used in liquid oxygen, the production of liquid nitrogen and other media, storage and low-temperature superconductor manufacturing process, because of its operating temperature is generally in-100 ℃ or even lower, then the crystal structure of the material will change, resulting in material strength and plastic greatly reduced, to safe operation brings hidden trouble. Pressure Vessel and Pressure Pipe Component This requires that such pressure vessels in the selection of materials must be noted.

(5) In addition, there are containers of large-scale and miniaturization of special applications such as occasions.

Technical development direction of pressure vessels

Pressure vessel is a multi-disciplinary and multidisciplinary comprehensive product, its construction technology involves metallurgy, mechanical processing, corrosion and anti-corrosion, nondestructive testing, security protection and many other industries. With metallurgy, the continuous progress of mechanical processing, Pressure Vessel and Pressure Pipe Component welding and nondestructive testing, especially the rapid development of information technology, represented by computer technology, has driven the development of related industries, and on the basis of a great deal of human and material resources in the world, the technical field of pressure vessel has made corresponding progress. In order to produce and use safer, more economical pressure vessel products, traditional design, manufacture, welding and inspection methods have been and are being replaced by new technologies and new products in varying degrees.