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Failure Forms and Preventive Measures of Parts and Components of Shell-and-Tub……

I. Composition and Structure of Shell and Tube Heat Exchanger Shell-and-tube heat exchanger is a traditional and widely used heat exchange equipment. Because of its strong structure and the ability to choose a variety of materials, it has strong adaptability. Shell-and-tube heat exchangers are widely used in various industries. They are often used as oil coolers in dilute oil stations in cement production enterprises and oil coolers in vehicle engines. For a long time, steel shell-and-tube heat exchangers have been dominant in the production and use of heat exchangers because of their strong structure, high reliability, strong adaptability and wide […]

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What is a corrugated pipe?

What is a corrugated pipe? Corrugated pipe: It is a cylindrical thin-walled folded shell with multiple transverse corrugations. Bellows are elastic and can produce displacement under the action of pressure, axial force, transverse force or bending moment.Bellows are commonly called corrugated pipe or corrugated box in America and metallbulgen or metal bellows in Europe. Types Material Metal expansion joint Non-metallic Expansion Joint Metal hose Metal bellows Types of Corrugated pipes Corrugated pipes mainly include metal bellows, bellows expansion joints, corrugated heat exchanger tubes, diaphragm diaphragm boxes and metal hoses. Metal bellows are mainly used to compensate thermal deformation, shock absorption […]

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Corrosion Behavior of Materials Used for Surface Gathering and Transportation ……

In recent years, with the expansion of oil and gas field exploitation, the development of natural gas industry and the construction of gathering and transportation pipelines, oil pipelines are bound to be affected by internal environment and media in the process of transporting crude oil, resulting in more and more serious corrosion. Corrosion of gathering and transportation pipelines will not only cause pipeline damage, oil and gas leakage, cause safety accidents, cause environmental pollution, endanger people’s health, damage property safety, but also bring great hindrance to the development of oil and gas fields, at the same time lead to adverse […]

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Process Pipeline (1)

Some people say that the role of pipelines in petrochemical plants is as important as the role of blood vessels in the human body, which is aptly described. The pipeline length of a large refinery unit is 50-80 kilometers. A 300,000-ton ammonia plant is over 100 kilometers. A 520,000-ton urea plant has 10 kilometers of photosynthetic gold steel and stainless steel pipelines. Pipeline design calculation accounts for more than 60% of the process calculation. According to investment calculation, a petrochemical plant accounts for 10% and 20% of the total pipeline investment. As far as construction is concerned, pipeline construction quantity and […]

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Cleaning Technology of Heat Exchanger

Heat exchanger is a compact and efficient heat exchanger, which is an excellent equipment for heating, cooling, heat recovery, rapid sterilization and other purposes. However, due to the long-term operation of heat exchangers, the different purity of cooling or heating side and the different nature of process media, scaling of heat exchanger has become inevitable, resulting in the reduction of heat exchange efficiency of heat exchangers, thus affecting the normal operation of production and the safety of equipment. Therefore, the tubesheet of heat exchanger should be cleaned regularly to remove dirt, so as to ensure the efficient heat transfer and normal […]

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Key Points for Production Preparedness of Duplex Stainless Steel Chemicals Ship

1. Introduction Pre-production preparation refers to combing and planning comprehensively from the aspects of technology, technology and materials before the formal start-up of construction, in order to find out the difficult and difficult work and solutions, and to pave the way for the smooth construction in the later period. Compared with steel ships, duplex stainless steel chemical tankers have special construction environment, construction technology, special tooling tools and protection requirements for the construction process. Therefore, the preparation before production is the key to the smooth construction of duplex stainless steel chemical tankers. The preparation before production directly affects the progress and protection […]

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Selection Standards and Requirements for Various Pipelines

Pipeline is a device for conveying gas, liquid or fluid with solid particles, which is connected by pipes, pipe connectors and valves. Usually, when the fluid is pressurized by blowers, compressors, pumps and boilers, it flows from the high-pressure part of the pipeline to the low-pressure part. It can also be transported by the pressure or gravity of the fluid itself. Pipeline is widely used, mainly in water supply, drainage, heating, gas supply, long-distance transportation of oil and gas, agricultural irrigation, hydraulic engineering and various industrial devices. Selection Standards and Requirements for Various Pipelines Seamless steel pipe Standard: Article 1: […]

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Current Situation of China’s Iron and Steel Enterprises and Demand Analy……

Investigation in Tangshan District 1. Demand side is weakening at the present stage and is expected to recover in the second half of the year. With the year-on-year increase in real estate demand from the beginning of the year to May, steel prices and steel profits have a wave of obvious expansion, but since May, steel prices and steel profits have been significantly reduced, we can see that the accumulation is caused by the periodic decline in demand. According to the intensive investigation in the past two weeks, the feedback from both the terminal and the steel mill industry shows […]

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Selection and application of mandrel in bend

ABSTRACT: The deformation of pipe in cold bending is introduced, and the method of bending ideal small radius pipe fittings is achieved by choosing mandrel reasonably and mastering its correct use method. Key words: stress; mandrel; relative bending radius; relative wall thickness Introduction Process Analysis Choice of Bending Way Selection of mandrels Correct use of mandrels 1. Introduction Bending pipe technology is widely used in boiler and pressure vessel industry, central air conditioning industry, automobile industry, aerospace industry, shipbuilding industry and other industries. The quality of bending pipe will directly affect the structural rationality, safety and reliability of products in […]

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How to choose a valve?

Valve is the control part of the fluid conveying system. It has the functions of cut-off, regulation, diversion, countercurrent prevention, stabilization, diversion and overflow relief. In the field of industrial production, choosing the right valve is particularly important for the overall control of the production process. With the continuous development of valve technology, the application field of valves is expanding, and the functions are becoming more and more perfect. In the face of various valve types and different application conditions, how will you choose valves correctly? Characteristics of Valves Valve Selection Basis Principles to be followed in valve selection How […]

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