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Production process of butt welded elbow and tee

Guide for production work of elbow fittings ( 1a ) Yaang Pipe Industry Co., Limited Process name Production process of seamless elbow Product code Yaang/YA-01 Process name Production process of pushing (bending) elbow Material Austenitic, Duplex steel, super austenitic Equipment Pipe fitting production equipment Indicate Common for the production of conventional pipe elbow Work step Process Content Precautions 1 Blanking 1) Cut the material strictly according to the size chart, and measure the length to check the appearance. a. During heat treatment, the holding time should not be less than20min , but it should not be too long. If the holding time is too long, […]

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Investment analysis report of heat exchanger industry in 2020

Overview of heat exchanger industry Heat exchanger is a kind of equipment that transfers part of heat from heat fluid to cold fluid, also known as heat exchanger. Heat exchanger is an indispensable equipment for heat exchange and transfer in chemical production. In petroleum, chemical, light industry, pharmaceutical, energy and other industrial production, it is often used to heat or cool the low-temperature fluid, vaporize the liquid into steam or condense the steam into liquid. Heat exchanger is not only a kind of unit equipment, such as heater, cooler and condenser, but also a part of a certain process equipment, […]

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Welding of high efficiency tube sheet

In the manufacturing process of shell and tube heat exchanger, including vessel manufacturing, shell and tube heat exchanger’s tube and tube sheet connection, tube plate baffle manufacturing, these three aspects have high requirements for welding process. Most of the shell and tube heat exchanger vessels are welded Hydrogen elimination treatment and post weld heat treatment shall be carried out for welds. In the process of welding, hydrogen from welding rod, flux and air decomposes into atomic state and dissolves in liquid metal at high temperature. When the weld is cooled, the solubility of hydrogen in steel drops sharply. Because the […]

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Super austenitic stainless steel: 254SMO (UNS S31254,F44,1.4547)

254SMO (UNS S31254, f44, 1.4547) super austenitic stainless steel overview: 254SMO (UNS S31254, f44, 1.4547) is a super austenitic stainless steel. Because of its high molybdenum content, it has high resistance to spot corrosion and crevice corrosion. This brand of stainless steel is developed for use in halogenated environments such as seawater. 254SMO also has good corrosion resistance. Especially in the acid containing halide, the steel is superior to ordinary stainless steel. Its C content is less than 0.03%, so it is called pure austenitic stainless steel (< 0.01% is also called super austenitic stainless steel). Super stainless steel is […]

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Development and performance test of 904L super austenitic stainless steel

In this paper, 904L super austenitic stainless steel was successfully smelted in a multi-functional medium frequency induction melting furnace in the laboratory and hot rolling experiments were carried out. The structure and inclusions of the cast slab were analyzed, and the solution treatment and performance test of the hot rolled plate were carried out at different temperatures. The results show that the structure of 904L slab after smelting is uniform, with coarse and long columnar crystal as the main component, less inclusions and small quantity; there are some differences in properties after solution treatment at different temperatures, and the microstructure […]

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Case sharing: leakage failure analysis of 316L stainless steel pipe

316L belongs to austenitic stainless steel, corresponding to domestic brand 022cr17ni12mo2, which has good plasticity and corrosion resistance. The addition of Mo element in the stainless steel greatly improves its pitting resistance. Therefore, 316L stainless steel is widely used in petrochemical, pharmaceutical and other industries. The 316L stainless steel pipe used in an enterprise was found to have leakage and perforation on its wall. The working medium in the pipe is water vapor, the working pressure is 0.9mpa, the medium outside the pipe is strong alkali and copper powder, the working pressure is 1.0MPa, and there is pressure difference between […]

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Piping arrangement in petrochemical plant

In petrochemical plant, pipelines with different operation parameters and transmission medium properties are quite different, and their importance and risk are also different. In order to better ensure the reliability and safety of pipelines in the operation process, different design, manufacturing and construction requirements are proposed for pipelines with different importance. Determination of pipeline design conditions Design pressure The design pressure of petrochemical pipeline and its components shall not be lower than the pressure under the most severe conditions combined by internal pressure and temperature during operation. 1. The design pressure of all pipelines connected with equipment or pressure vessel […]

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How to evaluate and eliminate water hammer in liquid collection system?

What is water hammer? In the pressure pipeline, because of some external reasons (such as sudden closing of valve, sudden stopping of pump unit), the flow velocity of water changes suddenly, resulting in water hammer. This kind of hydraulic phenomenon is called water hammer or water hammer. Water hammer is called water hammer because of the inertia of the pressure water flow when the power is cut off suddenly or the valve is closed too fast, which produces the water shock wave, just like the hammering. Sometimes, the force produced by the back and forth of the water flow shock […]

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Austenitic Stainless Steel: 904L (UNS N08904)

Characteristics of 904L UNS N08904, commonly known as 904L with its DIN equivalent W.Nr. 1.4539, is a low carbon super austenitic stainless steel. It has superior corrosion resistance to that of conventional Cr-Ni stainless steels such as SS316L and SS317L resulting from the deliberate addition of copper content. Although the 904L stainless steel has limited use with hydrochloric acids, it has high resistance to pitting corrosion in chloride solutions, high resistance to both crevice and stress-corrosion cracking. The grade is non-magnetic and has excellent formability and weldability, as well as good toughness in cryogenic temperatures. 904L stainless steels have greater […]

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Comparison of hydrostatic test and eddy current test for steel tube

The water pressure test and eddy current test of boiler tubes are the dense performance test of materials, and they are equivalent in the test method; and the eddy current test of steel tube has the characteristics of fast, accurate and easy to realize automatic detection, etc., which is superior to the water pressure test method which is time-consuming, labor-consuming and less accurate in the test method. Therefore, the eddy current test method can be used completely It can not replace the densification test of eddy current flaw detection. It is of great significance to control the material quality of […]

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